Develop Bugs

[QUEST] To save a ex-blacklisted Hero

Super condensed prologue:
UK T-Mobile HTC Hero bought from ebay
Unlocked via an IMEI generated code (i.e not serial cable method)
Worked fine for 3 months
Sudden onset of 'No Service' and 'sim cannot connect to this network
The battle:
Use CheckMEND to find status of IMEI
It's bloody blacklisted! (Seller is conducting insurance fraud...)
Contact T-mobile - they confirm there are many problems with the IMEI
Contact the seller - no help
Explain to seller I have figured out his full name, address, phone number and that I now know his wife was recently prosecuted for benefit fraud (she is actually the registered seller)
He tells me he will call later
No call - I call him, he says I won't get my money back
The uplifting moment:
I call Tmobile - they have now removed the blacklist
The seller must have informed Tmobile that it wasn't really lost
The crash:
The blacklist seems to have modified the handset so it's locked to Tmobile again.
T-mobile SIMs work.
All other report No Service.
Also, going into the test mode (VOL DOWN + PWR ON) I find that the SIMLOCK status now reports FILE OPEN FAILED!
Quest?:
I will fix this problem....
I've already:
Made a gold card
Flashed Generic latest ROM
Does anyone know how to re-flash the SIMLOCK area - even to default would help?
Would running the CID commands through a serial cable help?

To note: Now rooted with instant root. Will try and flash a recovery image and see what happens.
[METHOD] (source forum.xda-developers.com/showpost.php?p=4750940&postcount=4 - edited a live download location for Instant Root)
I first followed the instructions on making a goldcard and then flashed the 2.73.405.5 WWE rom fine.
Now make sure you have the cm-hero-recovery.img (content.modaco.net/dropzone/m...covery-1.0.zip) on the root of your sdcard.
Aswell as Instant Root (tecnophone.it/wp-content/uploads/Instant-Root-by-tecnophone.zip) now install Instant Root on the phone.
It should pop up with a notification "instant root was successfully" or along those lines. (If you have a problem installing Instant Root make sure Settings>Applications>Unknown Sources is checked)
Instant root then allows for root access with adb shell using the following 2 commands:
1) adb shell
then
2) su
the icon should change from a $ to #.
Now flash the recovery image with the following command:
1) flash_image recovery /sdcard/cm-hero-recovery.img
[/METHOD]
If flashing fails I'll try doing this with serial commands. I've seen a few people about the net with similar issues so hopefully if I am successful!

Just some extra info...
The handset may not be locked back to t-mobile as you cant lock a handset OTA, T-mobile are the only UK network that can actually amend the blacklist for other networks as its owned by T-mobile. When a csa/csr what ever they call them, removes the blacklist it removes it from T-mobile only as the assumption is you should not remove another networks blacklist request. If you are not the original owner of the handset and some CSR has removed they they have made a mistake (you bonus) but if it was not originally blacklisted by t-mobile the other networks will stay dead to it..

Thanks for the reply.
I called o2 who say it is not blacklisted on their system.
Hmmm, I'm not sure where I am left...
It works on T-mobile. but not other network.
It doesn't ask for an unlock code - Is there another lock somewhere?

I have just remembered the name of the system "Dali" if you speak to a team manager and say you have been told you need the blacklist removing from it if its still on..
If its not showing on that then it must be a handset issue..

anarchyuk said:
I have just remembered the name of the system "Dali" if you speak to a team manager and say you have been told you need the blacklist removing from it if its still on..
If its not showing on that then it must be a handset issue..
Click to expand...
Click to collapse
It is definately no longer blacklisted - meaning it's handset.
So this could be coincidental timing? I have a copy of the CheckMEND report saying it had been blacklisted.
Are we sure that T-mob cannot do something OTA?
Is there any way to restore the simlock data to default - I.e. relock it so I can re-enter my unlock code?

Im not sure about re locking it tbh, good luck!!

anarchyuk said:
Im not sure about re locking it tbh, good luck!!
Click to expand...
Click to collapse
Is there anyone who can help my poor HTC Hero!

instead of using the gold card way to get the recover image use http://android.modaco.com/content/h...ng-the-patched-recovery-image-on-your-device/ if you havent already got it on, then put generic rom on and re try,, just an idea its how i flashed mine with new roms, never used a gold card

anarchyuk said:
instead of using the gold card way to get the recover image use http://android.modaco.com/content/h...ng-the-patched-recovery-image-on-your-device/ if you havent already got it on, then put generic rom on and re try,, just an idea its how i flashed mine with new roms, never used a gold card
Click to expand...
Click to collapse
I've got the patched recovery image on now - using gold card.
Could you do me a favour and do the following and post results for comparison:
Turn phone on holding VOL DOWN + POWER
Then goto Fastboot
Then press CALL to do the SIMLOCK test
I get:
--
FAT32 Init Ok
Open File Fail
---
Your result may really help guide my research&testing here!

I also just thought - would one of those Rebel Sim Cards get round this?!

I have just ordered an unlock code on ebay to help you test as mine is t-mobile uk also,
Fat32 Init OK
Open File Fail
Reboot device?
is what i got!!

anarchyuk said:
I have just ordered an unlock code on ebay to help you test as mine is t-mobile uk also,
Fat32 Init OK
Open File Fail
Reboot device?
is what i got!!
Click to expand...
Click to collapse
Hmm, so that's the standard response? Maybe for a locked phone?
Could any people who are unlocked please post a response?!

still waiting for my code, I have had to downgrade to a GSM rom as the new eris 2.1 leaks are cdma and dont offer the sim unlock option!!

anarchyuk said:
still waiting for my code, I have had to downgrade to a GSM rom as the new eris 2.1 leaks are cdma and dont offer the sim unlock option!!
Click to expand...
Click to collapse
Where do I find the simunlock option?! I can't remember it or it's no longer there..

itsmonkey said:
Where do I find the simunlock option?! I can't remember it or it's no longer there..
Click to expand...
Click to collapse
If the phone is locked when you put another sim with another nck code it will auto appear, have you tried another rom like mrbang;s?

Some details from an Dutch Retail unlocked phone.
So never had an simlock:
-------------------
FAT32 Init OK
Open File Fail
Reboot device?
<MENU> Reset Device
--------------------
all roms i used are stock updates, bought 8 days ago

itsmonkey said:
Hmm, so that's the standard response? Maybe for a locked phone?
Could any people who are unlocked please post a response?!
Click to expand...
Click to collapse
I have a Hero (G2) which was on T-Mobile but was unlocked with a code from eBay.
Just tried the simlock test and get the same result as everyone else...
Code:
Fast32 Init OK
Open File Fail
Reboot device?
I'm using a custom ROM but is based on a stock one.

I have an unlocked phone and I also get the same output regarding simlock.
(not rooted, stock rom)

network unlock Acer liquid mini e310

is it possible for free to unlock this phone ? any flash or solution to unlock it ?
thanks.

bono.bel said:
is it possible for free to unlock this phone ? any flash or solution to unlock it ?
thanks.
Click to expand...
Click to collapse
I also was looking for it ....

Greetings;
As far as i know there is 2 ways to unlock it.
1) (Paid) Get a online service (Ebay for Example); nearby store or your service provider to do it.
2) Search Google for a Software called "QCOM" (I don't remember the exact name)
I've downloaded several versions; tried hard to get this software working; but with no luck.
Also; seems like unbranding this device won't work.

this QCOM or OMAP is a cracked software of furious box, i have this box, but without OMAP software activated. who have this box with activated pack of this soft, can unlock this phone.
br

So what you mean is that it is necessary to have the "box" and to activate the software Right?
Well, after reading this post i've done another attempt.
The instructions don't mention anything about the pack; or activation.
Only:
"ACER S100 Liquid/LiquidE E310 Liquid Mini UNLOCKING GUIDE
NOTE: HOW TO INSTALL DRIVERS AND UNLOCK
1. PRESS VOLUME DOWN + CAMERA AND INSERT USB CABLE FOR S100
2. FOR E310 CONNECT PHONE IN NORMAL MODE
3. DOWNLOAD AcerLiquidDrivers.zip / Driver_E310.rar FROM SUPPORT AND INSTALL
4. START AMDO AND PRESS UNLOCK "
After opening AMDO; i get a message saying: "there are no card readers".
I guess that's the reason it doesn't work
br

yes furious box with activated pack 5 http://www.furiousgold.com/ me i have this box with only pack1, 2, and 3. not the 5.

Well, it's quite expensive to unlock my device only.
It's not that i need it atm, i was trying more to know how to do it.
I guess the best option is to take the device to Service Provider or a Store which does such service.
Thanks;
BR

of course, you can't buy the box to unlock your phonr only, i have this box and many boxes cause it's my job

i can unlock this phone, send me pm if interested

thanks for the info

Also looking for way to unlock an E310 locked by French Telco SFR (on RedBySfr),
I updated fimware to latest ACER release, and rooted it, then what ?

Experiences SIM unlocking SGH-I747 (Galaxy S III) AT&T 4.3 with codes

Has any one had positive experiences with SIM unlocking the AT&T sgh-i747 (Galaxy S III) after the 4.3 update with a code??
I paid $14.99 to SamMobile to unlock using their software but it didn't work and they don't answer my emails. But that's not with a code
Admins: if there is a thread for this already, please point me to it. I could not find one with successes after the 4.3 update
Note that AT&T didn't want to give me a code: I had cancelled the service already and paid the ETF (foolish, I know), and now they don't care about me

I've seen plenty if users have success unlocking with a code. I don't know about how sammobile does it though.
You have to be stock for it to work BTW.
Sent from my SAMSUNG-SGH-T999 using Tapatalk

Thanks doc. By "stock" you mean the official ROM without root? As I said, it's not the original version (4.1.1) but the OTA update to 4.1.3 by AT&T
I will have to buy some code

Root doesn't matter. Many custom stock based ROMs will also work but some may have removed some needed files which is why I just said stock. As long as its stock based and has the stock dialer it should work though.
Sent from my SAMSUNG-SGH-T999 using Tapatalk

So, no one has any experience to share? has anyone unlocked a Galaxy S III 4.3 with a code? It's OK if you prefer to PM that info to avoid being interpreted as advertising

Official AT&T Unlock Code Fails
My contract ended id-September so I requested an unlock code, which was previded (below). I sent two separate requests for the unlock code and the number provided twice matches. I tried the unlock code (while using a T-Mobile SIM card) twice and the phone said the code was incorrect.
I prepared the phone by doing a factory reset. These are the phone details:
Model number
Samsung-SGH-I747 running
Android version
4.4.2
baseband
I747UCUFNE4
kernel
3.4.0-1514807
[email protected] #1
Mon May 19 21:00:05 KST 2014
Build number
KOT49H.I747UCUFNE4
These are the instructions provided:by AT&T:
Thank you for contacting AT&T Customer Care about unlocking your AT&T Mobile device. We have reviewed your request and confirmed that the device may be unlocked. You should complete the unlock process before porting out your number for use with another carrier. Please allow 24 hours upon receipt of this notification to complete the unlock process.
Your Unlock Code is :12345678
Unlock Steps - Use Non-AT&T SIM Card
1. Power off the device and insert a non-AT&T SIM card.
2. Power on the device.
3. Network Lock displays: Enter the device unlock code.
4. Enter the eight-digit unlock code.
5. Press OK.
Note: You are allowed five attempts to unlock before your device permanently locks to the AT&T network. Note: If your device has been altered from the original manufacturer's standards, such as rooting the device, your unlock code may not work and you will need to contact the original manufacturer for assistance.
For questions regarding AT&T Mobile device, please visit the Phone/Device Learning Center. Thank you for your business. For other questions about our AT&T wireless service or other Mobile devices, please visit att.com.
I've tried the unlock twice and it did not work. The phone is rooted. I think I manually installed 4.4.2 because the OTA failed many time to update.
I think these instructions are confusing in that step 3 and step 4 both say enter the unlock code. Is there a second code? I thought an phone unlock code is a single 8-digit number.
I have successfully unlocked an old HTC Aria so I have a little bit of experience performing unlocks. But if you have advice I'd appreciate hearing your thought.

wpscully said:
My contract ended id-September so I requested an unlock code, which was previded (below). I sent two separate requests for the unlock code and the number provided twice matches. I tried the unlock code (while using a T-Mobile SIM card) twice and the phone said the code was incorrect.
I prepared the phone by doing a factory reset. These are the phone details:
Model number
Samsung-SGH-I747 running
Android version
4.4.2
baseband
I747UCUFNE4
kernel
3.4.0-1514807
[email protected] #1
Mon May 19 21:00:05 KST 2014
Build number
KOT49H.I747UCUFNE4
Click to expand...
Click to collapse
Forgive me for asking but is your phone running a stock ATT ROM? Does the imei obtain from the phone match the imei on the label under the battery?

audit13 said:
Forgive me for asking but is your phone running a stock ATT ROM? Does the imei obtain from the phone match the imei on the label under the battery?
Click to expand...
Click to collapse
Yes, the IMIE shown on the label and via About device --> Status are identical. I asked AT&T twice for the unlock code because I thought maybe I sent the wrong code. I'm 99.9% sure the IMIE number I used is correct.
Yes, the flavor of Android installed is the AT&T version. If I recall, in August 2014 I used ODIN to manually install 4.4.2 because the over-the-air update was not working. (The OTA would download but fail to install. I'd wait for two or three days before I could try a second, third, forth... time.) I have also done a reset via Accounts --> Backup and reset. The MicroSD card was erased too, through the reset process. The lock screen, the home screen, all the typical AT&T add-on applications seem to be as they were when I purchased/upgraded the phone two years ago.
4.4.2 is rooted and I have Chainfire's SuperSU v2.00 Pro installed.
I should mention this: When I look at About device --> Status, all the way at the bottom, is "Device status" which shows "Custom". This isn't a setting. I suppose this is why the network unlock code is not working.
I'm not sure what to do next. I can't recall the page on XDA which guided me through the install of 4.4.2. I'll look a little harder because I'm sure I used XDA as my guide for the upgrade. Perhaps I'll try to install a non-root 4.4.2 image.
I never expected that I'd have five and only five tries at network unlock. I've used three tries... I need to make sure the last two work! Any advice is appreciated.

Sorry, I'm out of ideas. All I can suggest is flashing back to completely stock with stock recovery and no root access.

someniceguy said:
Note that AT&T didn't want to give me a code: I had cancelled the service already and paid the ETF (foolish, I know), and now they don't care about me
Click to expand...
Click to collapse
In my case AT&T told me they would not give me a code until I paid off my contract. I would seem they don't care about their former or current customers.
I showed them though, I was still on 4.1.2 and simply donwgraded my modem and used the free unlock method. It's now time to upgrade to kitkat.

@wpscully
Don't know if you still need help, but maybe this would do the trick? I think it's the last post that's describing a different method of getting the unlock code to work.
http://forum.xda-developers.com/showthread.php?p=55677344
Sent from my SAMSUNG-SGH-I747 using Tapatalk

@DocHoliday77, your pointer you mention above has proven invaluable. For the record here is the link I used; http://forum.xda-developers.com/showpost.php?p=55677344&postcount=137 MrBrown72 has a secret code and menu selections which seem to tell my phone to ignore all the customizations I made (root, maybe removing some AT&T bloat) and accept the valid network unlock code AT&T provided when my contract ended. The phone is now working on T-Mobile, rooted still, and none the worse for wear. I also want to thank Audit13 for advice on what not to do, and well as his guiding me so I found the hints that the phone considered itself "custom".
Finally I'll mention that if I had not been able to unlock this phone I never, ever would have selected AT&T as a cell provider. In this process they were professional, respectful, and helpful. T-Mobile didn't get my old line transferred before my AT&T contract ended. AT&T probably could have made clearing up this transfer very hard. But they were kind, understanding and efficient in reinstating my old number briefly so T-Mobile could finish the transfer.
I know others have had trouble with vendors. I wish all companies could understand that being unhelpul or rude is the fastest way to lose a customer for life.

N910P - I have MSL code but no prompt to unlock? please help

Hi All,
Please help.
Goal:
- unlock N910P for domestic US (I have MSL code from Sprint)
- do not want to root
Details:
- account and phone is paid
- Sprint gave me MSL saying it is my unlock code
- 5.1.1
- has been reset to factory and cleared cache
- I watched a few videos saying that I need to put a different carrier sim in and it will prompt for the MSL code to unlock
- I have tired 4 sim from T-Mobile and AT&T, 2 are working sim from working phone... none will prompt for code
- I tried ##3282# which get me to manual settings but I am not sure if I should mess with it
- invalid sim for T-Mobile and AT&T but works fine for Sprint
- I read that it may work with Kit Kat but I cannot downgrade without root
Thank you all in advance.
Please let us not get into the debate of carriers and GSM/CDMA. I just need help with the unlock portion. Thank you again. :highfive:

SA1GON said:
Hi All,
Please help.
Goal:
- unlock N910P for domestic US (I have MSL code from Sprint)
- do not want to root
Details:
- account and phone is paid
- Sprint gave me MSL saying it is my unlock code
- 5.1.1
- has been reset to factory and cleared cache
- I watched a few videos saying that I need to put a different carrier sim in and it will prompt for the MSL code to unlock
- I have tired 4 sim from T-Mobile and AT&T, 2 are working sim from working phone... none will prompt for code
- I tried ##3282# which get me to manual settings but I am not sure if I should mess with it
- invalid sim for T-Mobile and AT&T but works fine for Sprint
- I read that it may work with Kit Kat but I cannot downgrade without root
Thank you all in advance.
Please let us not get into the debate of carriers and GSM/CDMA. I just need help with the unlock portion. Thank you again. :highfive:
Click to expand...
Click to collapse
You couldnt downgrade to kitkat even if you were rooted. Youre on a locked bootloader.

yup, I concluded that after a few hours of testing... tried several rev of Odin3 and several OEM ROM... all fail to auth... was hoping as last option that root will work but didn't plan for that route...
Are there any options to get the prompt for domestic SIM/carrier unlock? Whether auto or manually?
The only paid unlock service I see for N910P that guarantee it is on eBay... are those trustworthy?

SA1GON said:
yup, I concluded that after a few hours of testing... tried several rev of Odin3 and several OEM ROM... all fail to auth... was hoping as last option that root will work but didn't plan for that route...
Are there any options to get the prompt for domestic SIM/carrier unlock? Whether auto or manually?
The only paid unlock service I see for N910P that guarantee it is on eBay... are those trustworthy?
Click to expand...
Click to collapse
Why not use GalaxyTools to Sim Unlock if you have MSL?

xxSTARBUCKSxx said:
Why not use GalaxyTools to Sim Unlock if you have MSL?
Click to expand...
Click to collapse
From my limited research, I believe it does not support 5.1.1 or requires root or both.
Please correct me if I am wrong.

SA1GON said:
From my limited research, I believe it does not support 5.1.1 or requires root or both.
Please correct me if I am wrong.
Click to expand...
Click to collapse
Requires root.

toenail_flicker said:
Requires root.
Click to expand...
Click to collapse
thank you for confirmation... I am trying to stay away from root as full tech support is more important to me at the moment.

SA1GON said:
thank you for confirmation... I am trying to stay away from root as full tech support is more important to me at the moment.
Click to expand...
Click to collapse
I get that. I am, otoh, straddling that fence atm. I prefer root, but I just got the Note 4 so I spend my day cursing at the ads and playing "I wish, I wish..." Soon, very soon. :fingers-crossed:

Only way to get it running is root and GT
Sent from my SM-N910P using Tapatalk

Andrew K. Sterling said:
Hi there,
Try these:
Method #1 Go to the dial screen on your phone as if you are going to make a call and press #7465625*638*# Once prompted for code, enter the 8 digit Unlock Code.
Method #2 Go to the dial screen on your phone as if you are going to make a call and press: #7465625*638*UNLOCKCODE# (you can try this method only if you already received the Network Unlock Code)
Method #3 Go to the dial screen on your phone as if you are going to make a call and press: #0111*UNLOCKCODE# (you can try this method only if you already received the Network Unlock Code)
Click to expand...
Click to collapse
I know it has been a whie since you posted this, but the first method prompted me for network unlock key but the key sprint provided me was only six digits. and they actually provided a second one after the first was unsucessful. the second had no better results. Any hints?

Andrew K. Sterling said:
Hi there,
Try these:
Method #1 Go to the dial screen on your phone as if you are going to make a call and press #7465625*638*# Once prompted for code, enter the 8 digit Unlock Code.
Method #2 Go to the dial screen on your phone as if you are going to make a call and press: #7465625*638*UNLOCKCODE# (you can try this method only if you already received the Network Unlock Code)
Method #3 Go to the dial screen on your phone as if you are going to make a call and press: #0111*UNLOCKCODE# (you can try this method only if you already received the Network Unlock Code)
Click to expand...
Click to collapse
Is the network unlock code the same as the MSL?

SA1GON said:
yup, I concluded that after a few hours of testing... tried several rev of Odin3 and several OEM ROM... all fail to auth... was hoping as last option that root will work but didn't plan for that route...
Are there any options to get the prompt for domestic SIM/carrier unlock? Whether auto or manually?
The only paid unlock service I see for N910P that guarantee it is on eBay... are those trustworthy?
Click to expand...
Click to collapse
I'm sure there's some way to use your msl to unlock, but I don't know how.
But if you give up, I used www.idoneapps.com
I used him and worked flawless. They have good support too.
I think you need to flash pc1 firmware or below to unlock but after you unlock you can flash anything else. As long as you don't disturb your efs partition you'll be unlocked. (But this requires root)
Hope you figure it out without having to pay, but if not, they're great.

Here , this will take all your problems away ?
#7465625*638*#
Unless ... for some weird aşş reason it doesn't work with your phone ? Then just look up on Google a secret dial code to force the network unlock code input for whatever phone you have

Have Xfinity Mobile A50, Unlocked, but can't edit APN's to use with Verizon MVNO

Hi,
I've got a Samsung A50 that I originally got from Xfinity Mobile, a Verizon MVNO. It worked fine when I switched to T-Mobile but wouldn't work on US Mobile, another Verizon MVNO, because on this model you can't change the APN's manually. I suspect that although it was supposed to be unlocked, Xfinity messed with the ROM to make it harder to use on other Verizon services.
Question: Is there a way I could reflash this so it would be a more standard A50, and allow me to edit APN's and then use it on US Mobile. I like the phone, and would love to keep using it but need to be able to manually edit APN's.
thanks for your help.

android94301 said:
Hi,
I've got a Samsung A50 that I originally got from Xfinity Mobile, a Verizon MVNO. It worked fine when I switched to T-Mobile but wouldn't work on US Mobile, another Verizon MVNO, because on this model you can't change the APN's manually. I suspect that although it was supposed to be unlocked, Xfinity messed with the ROM to make it harder to use on other Verizon services.
Question: Is there afway I could reflash this so it would be a more standard A50, and allow me to edit APN's and then use it on US Mobile. I like the phone, and would love to keep using it but need to be able to manually edit APN's.
thanks for your help.
Click to expand...
Click to collapse
I'm going to revise and revisit my post so that this goes a little more concisely for anyone who wants to do it in the future - Thanks for hanging in with me Android, too little sleep and time... LOL
Changing your device to VZW CSC - YES So this can certainly be done - XFinity exclusively runs on Verizon's network so your hardware won't give you any issues, you just need new ROM software. Let's start with first things first - did you pay off the device with Xfinity/Comcast and request the code from them to Carrier Unlock (OR carrier unlock it elsewhere) - because we'll need the hardware to be carrier unlocked before we continue too far down the road. I assumed you had - but to generalize it for everyone getting your device carrier unlocked so we CAN change its CSC will be step 1.
1. Make sure your device is Carrier Unlocked - (Will take the sim of any carrier it supports in hardware - not locked to XfinityMobile_ IF you paid off your phone with Xfinity Mobile you can just call them and request an unlock code and they'll send you one - if they can't/won't Samkey has 2 code readers - 1 of them oughta work PM me...
2. Now that you have an unlocked device your hardware will allow you to change CSC flash a new ROM, etc, but you still need the software for that VZW )Verizon) CSC to be available before you can switch your device to it. The vest way to accomplish this purpose is to crossflash yoru device from the carrier specific ROM device you have now the SM-A505U CCT to the SM-A505U1 XAA which is the US multi=carrier rom which wou ld have come with your phone if your bought an unlocked unbranded device fro Samsung direct in the first place - you can turn your unlocked U device into a U1 and back though why you'd want to??? by using the RaymondPatched Odin which will ignore the checks that it's the same model.
The ODIN you shall use for the purpose is the 3.14.1 3B Patched ODIN, and you may find a copy of it in many places one of which is: https://odindownload.club/odin-3-14-1-patched-modded-for-windows/
You shall also need the ROM to flash - it's the ROM for the SM-A505U1 device with the XAA CSC which supports many carriers CSC including yours VZW. One place I like to find such a ROM is at samfw.com but you can use freyja tool and download it directly from Samsung if you wish - you'll just have to work a little harder... If you did this today - this would be the most current rom - just visit the device page for updates US XAA device main page https://samfw.com/firmware/SM-A505U1
Current ROM https://samfw.com/firmware/SM-A505U1/XAA/A505U1UESCCUD2
DL the ROM, unzip it, Make a backup - this will wipe your device and it should to give you a clean install and save probs down the road - use the CSC full file in the Odin slot for CSC not the CSC_Home which will save your data- you don't want to dirty flash a ROM change - the wipe will be better long term... Just backup your stuff first.
Flash your XAA rom to the device- after taking out your SIM of course....
Reboot, insert the VZW Verizon sim - should see that it's setting your device to the Verizon CSC - Profit...
If not, Use Samkey again or the code - but take the 2 off the end for Android 10. Other codes forthcoming to enter engineering - I'm tired just ask...
Good luck
L4XS

I appreciate your help. I believe USC is US Cellular, but I am using US Mobile, a Verizon MVNO so I would need VZW as my CSC. Would SamKey method allow me to change to VZW?
APN Chooser just shortcuts to the Access Points settings, where the add button and the reset to default are greyed out and not functional.

L!V3_4_XC3SS said:
I have an Xfinity device, what they've done with my device is left the underlying functionality intact, but just hidden the menu - with my formerly carrier locked device I took the action of downloading the APN Chooser app from the play store and was able to access the menu to edit my apn settings in this fashion.
You could also potentially buy a couple of SamKey credits and change your CSC to USC from CCT if the combo rom is installed on that phone, but YMMV depending on what Xfinity did to its rom.
If that fails the stock rom for your device (Your current CSC is CCT for Comcast/Xfinity Mobile) can be downloaded from https://samfw.com/firmware/SM-A505U and flashed with Odin or Heimdall either of which can be downloaded there as well - the latest rom of your phone with the US cellular CSC (carrier/country specific code) USC for settings and software is located at https://samfw.com/firmware/SM-A505U/USC/A505USQSCDUE1 Or you can look through all the roms and see which version you want if you don't want the latest and greatest for some reason.
Once again it will WIPE your device - backup what you want . I think I have an extra samkey credit you can have if you want to try that first hit me up in the PMs --
L4XS
PS - If you love US Cellular great - flash the Rom in my link- but if you think you might want to change again flash the XAS ROM (US Wholesale multi-carrier) which you can find easily from the first link on SamFW.com or you can use frija tool from the Samsung servers or whichever ROM source you prefer - if you install that one the CSC will switch to the settings of whatever carrier's sim you put in - you can see the carriers included on each rom by searching your model on samfw.com.
Click to expand...
Click to collapse

There's a good place to edit instead of making you read through the old stuff that's we found out is irrelevant. Comcast and Xfinity which are the same thing and Verizon both love to mess with their ROMS, The really the only way to proceed here and I know it gave you a scary message but if you already have your device unlocked directly from Xfinity they should have given you a code if you asked for one when you paid it off and you obviously have one or else you wouldn't have been able to use a T-Mobile SIM. Since the one-time thing if your device is unlocked it's unlocked perpetually. Which means now you can change by flashing from a single CSC ROM sm-a505u U model crossflash it with the patched Odin by Raymond will work that's 3 14. 1- B3 Patched crossflashb a U1 multi-device XAA rom regardless of whatever scary warning Samkey showed you.
They're easy to find or I can even attach him you can find the ROM on Samfw.com
Define the latest xaa ROM for the

PS - If you love US Cellular great - flash the Rom in my link- but if you think you might want to change again flash the XAS ROM (US Wholesale multi-carrier) which you can find easily from the first link on SamFW.com or you can use frija tool from the Samsung servers or whichever ROM source you prefer - if you install that one the CSC will switch to the settings of whatever carrier's sim you put in - you can see the carriers included on each rom by searching your model on samfw.com.
L!V3_4_XC3SS said:
Looks like I was reading too quickly... LOL - Yeah so with the US Mobile MVNO the best route is to do exactly that - change your CSC to VZW which is Verizon which network it's US Mobile MVNO's - and then manually enter the proper settings for your APN once you've inserted that sim - it will likely get you the correct default settings if you reset your network settings in the settings > General >reset network as the Verizon network knows how to handle US mobile sim traffic - but it's not a big deal to enter manually. If you don't have the functionality after a CSC change you'll have to change CSC and flash the VZW Rom which will definitely do the deed -
Try samkey First it's easier - I'll send you a u/p that I stil have
Click to expand...
Click to collapse
Thanks! I appreciate it. Fingers crossed.

So I checked the CSC on the phone after Odining a current Verizon firmware, but it is still CCT,CCT,CCT (comcast).
The version SW info is: A505USQSCDUE2/A505UOYNCDUE2/A505USQSCDUE2/A505USQSCDUE2
Using Samkey, it gives me an ominous warning. Says: "Your phone has special carrier settings. It is not recommended to change CSC on this model. Because Security Area (SEC) may get "Relocked" and no way to unlock it again. "
So I bailed. Any ideas? I don't understand the warning. What would happen if I continued? Is there another option?
My phone has android 11, maybe that is the problem?
I am wondering if I should use the patched Odin and try again. Or just dump this phone and buy another? Help is very appreciated.

Ohhkay then... Let's get done for you what you wanted here... full change to VZW as your CSC --- You're not far off - CCT, is Xfinity Mobile - which is an MVNO that runs exclusively on the Verizon (VZW) network so I guess it was close- It would only have switched again if the phone had Xfinity sim into a device with relevant multi-CSC firmware... That being said, - If you want to switch it to Verizon on a device with either the multi-rom XAA or the VZW ROM that you flashed plus a SIM from the relevant network - or if you're a crazy like me who like to use 2 different CSC's on a dual-sim device - you don't even need more codes of SamKey -- do the following methodology and you should get what you want.
Using Google's phone dialer or a dialer of your choice that allows codes to be initialized - if you have stock Samsung phone you can try this minus the outside set of *# #* and see what you get...
Enter the Service Mode on your device as follows: Using the dialer from above type into ita *#*#276633683782#*#* -- This is for Android 11 OneUI 3.0+ take off the 2 for an older version Samsung device if you want to generalize my instructions.
You will enter the engineering menus at (5) RF TEST -- You may not use your normal back key to navigate here, you will exit the menus... Instead you will select the 3 dots top right corner which gives you the options - END, BACK, HELP, WIFI -- End/Back are going to be the ones that are relevant - don't bother with help it's not helpful... Back - the obvious, END, kicks you out of engineering and back to your phone.
Select your only choice - 5 RF TEST - and then a couple more random things (DON'T mess with the settings unless you know what it does) until it kicks you back to the full main menu.
It's going to have options 1-7 and say MAIN MENU at the top - You will be selecting option 1 - PROTOCOL STATE , then at the following menu Select 6 - PROTOCOL SIMULATION which you select and then you will be brought to a 3 option PROTOCOL SIMULATION menu -- Select 2 IMEI PRE CFG SIMULATION - which will take you to a 5 option menu - AP - (YOUR CURRENT CSC) --> and then you get to choose CSC options that you have available to simulate - but the thing is when you reboot after simming it, it will change your CSC settings for real if you've got a SIM and ROM from VZW or the Multi carrier XAA rom. - If you've got a verizon sim you should be able to change the 2 options CSC of AP and NET1 to VZW which will put you where you need to be - or some of the other US carriers... - Change the top 2 (or 3 if you have a dual sim device setup) CSC's to your preference - write them, reboot, It'll see your sim and change to your VZW network you wanted in the first place.
Let me know how this goes for you - I've done everything you can do with that phone - if you've got the right ROM on there which do - I'll bet you can get it to a VZW stock device - install their apps, delete their bloatware with the ADB command line, and you should be good.
Good luck bud, Let me know how it goes..
L4XS

L!V3_4_XC3SS said:
Ohhkay then... Let's get done for you what you wanted here... full change to VZW as your CSC --- You're not far off - CCT, is Xfinity Mobile - which is an MVNO that runs exclusively on the Verizon (VZW) network so I guess it was close- It would only have switched again if the phone had Xfinity sim into a device with relevant multi-CSC firmware... That being said, - If you want to switch it to Verizon on a device with either the multi-rom XAA or the VZW ROM that you flashed plus a SIM from the relevant network - or if you're a crazy like me who like to use 2 different CSC's on a dual-sim device - you don't even need more codes of SamKey -- do the following methodology and you should get what you want.
Using Google's phone dialer or a dialer of your choice that allows codes to be initialized - if you have stock Samsung phone you can try this minus the outside set of *# #* and see what you get...
Enter the Service Mode on your device as follows: Using the dialer from above type into ita *#*#276633683782#*#* -- This is for Android 11 OneUI 3.0+ take off the 2 for an older version Samsung device if you want to generalize my instructions.
You will enter the engineering menus at (5) RF TEST -- You may not use your normal back key to navigate here, you will exit the menus... Instead you will select the 3 dots top right corner which gives you the options - END, BACK, HELP, WIFI -- End/Back are going to be the ones that are relevant - don't bother with help it's not helpful... Back - the obvious, END, kicks you out of engineering and back to your phone.
Select your only choice - 5 RF TEST - and then a couple more random things (DON'T mess with the settings unless you know what it does) until it kicks you back to the full main menu.
It's going to have options 1-7 and say MAIN MENU at the top - You will be selecting option 1 - PROTOCOL STATE , then at the following menu Select 6 - PROTOCOL SIMULATION which you select and then you will be brought to a 3 option PROTOCOL SIMULATION menu -- Select 2 IMEI PRE CFG SIMULATION - which will take you to a 5 option menu - AP - (YOUR CURRENT CSC) --> and then you get to choose CSC options that you have available to simulate - but the thing is when you reboot after simming it, it will change your CSC settings for real if you've got a SIM and ROM from VZW or the Multi carrier XAA rom. - If you've got a verizon sim you should be able to change the 2 options CSC of AP and NET1 to VZW which will put you where you need to be - or some of the other US carriers... - Change the top 2 (or 3 if you have a dual sim device setup) CSC's to your preference - write them, reboot, It'll see your sim and change to your VZW network you wanted in the first place.
Let me know how this goes for you - I've done everything you can do with that phone - if you've got the right ROM on there which do - I'll bet you can get it to a VZW stock device - install their apps, delete their bloatware with the ADB command line, and you should be good.
Good luck bud, Let me know how it goes..
L4XS
Click to expand...
Click to collapse
The first step gets me in HW test, and then I can't get anywhere else.

So thanks for the updating of your ROM and Device specs, and that shed the light necessary for me to understand where we are at with your device...
So the reason this has happened is because this was an originally carrier locked - model U with only a specific carrier's ROM prob the Xfinity CCT - that's the only thing it could give you as far as a CSC which is why SamKey didn't get it done for you. I'll be happy to give you another SamKey code but you won't need it - and I'll also give you a different corrected code for entry intp the menus for the second methodology I spoke about as well...
To fix this situation you'll need:
A copy of the Raymond patch version of Odin which is 3.14.1 3B Patched you can search or here's one place -- https://odindownload.club/odin-3-14-1-patched-modded-for-windows/
It needs to be patched even though you're flashing stock FW because you're going to crossflash a U device to a U1 rom which is fine 'cus it's the same hardware but full official Odin still wouldnt' allow it. This will allow you to flash a rom to your device with the XAA CSC which the multi rom... it supports myriad US carriers including the one you want. VZW...
Remember that you're going to want to backup important data before you execute this procedure - you always want to use the full CSC file in the relevant Odin slot when you change a device's ROM not the HOME_CSC (you can get away with it if you're changing CSC on same rom) because you need a wipe to ensure the best possible flash on your device - don't dirty flash the U1 ROM in an attempt to avoid backup & keep your data it will bring problems down the road.
Take out your sim before flashing the new rom
Flash your SM-A505u device with the orginal CCT CSC to a u1 (originally unlocked) device with the XAA CSC as follows:
Download the latest XAA rom for the sm-A505U1 device
here's one place that usually does a decent speed download:
https://samfw.com/firmware/SM-A505U1 then go choose XAA in the CSC box,
If you did it today this would be the latest ROM https://samfw.com/firmware/SM-A505U1/XAA/A505U1UESCCUD2
I usually recommend the latest unless you have some reason you don't want to increment your bootloader or etc. not usually relevant.
You have the patched ODIN from above, already, so now you DL the latest rom for the U1 device with the XAA CSC (American Multi-rom has a bunch of US CSC's
Extract the ODIN, unzip the Rom zip file into its parts - run the ODIN find the unzipped roms pieces and put them where they go -- except home_csc won't need that one this time. Reboot phone into download/odin mode adb reboot download at the adb prompt ought to do it 4u, and then when it comes up you can flash the rom... as i stated above
After a successful flash/reboot change CSC to VZW by rebooting after you insert the sim card of your preferred network and then it should change you over to the new CSC appropriately. In your case VZW (Verizon) should be on point.
If for some reason it doesn't, I'll give you another samkey credit or you can go for the 2nd method you won't need any credits - enter the service mode by
*#*#197328640#*#* instead of my first code and let's see where that gets us...
You could use this same situation for an international A50 device but you'd have to sub the correct ROM for your region..
Sorry this one was a little convoluted but we'll get there... Maybe I'll come back and clean it when it works for you so it will be more useful to others.
L4XS

android94301 said:
So I checked the CSC on the phone after Odining a current Verizon firmware, but it is still CCT,CCT,CCT (comcast).
The version SW info is: A505USQSCDUE2/A505UOYNCDUE2/A505USQSCDUE2/A505USQSCDUE2
Using Samkey, it gives me an ominous warning. Says: "Your phone has special carrier settings. It is not recommended to change CSC on this model. Because Security Area (SEC) may get "Relocked" and no way to unlock it again. "
So I bailed. Any ideas? I don't understand the warning. What would happen if I continued? Is there another option?
My phone has android 11, maybe that is the problem?
I am wondering if I should use the patched Odin and try again. Or just dump this phone and buy another? Help is very appreciated.
android94301 said:
The first step gets me in HW test, and then I can't get anywhere else.
Click to expand...
Click to collapse
Click to expand...
Click to collapse
android94301 said:
So I checked the CSC on the phone after Odining a current Verizon firmware, but it is still CCT,CCT,CCT (comcast).
The version SW info is: A505USQSCDUE2/A505UOYNCDUE2/A505USQSCDUE2/A505USQSCDUE2
Using Samkey, it gives me an ominous warning. Says: "Your phone has special carrier settings. It is not recommended to change CSC on this model. Because Security Area (SEC) may get "Relocked" and no way to unlock it again. "
So I bailed. Any ideas? I don't understand the warning. What would happen if I continued? Is there another option?
My phone has android 11, maybe that is the problem?
I am wondering if I should use the patched Odin and try again. Or just dump this phone and buy another? Help is very appreciated.
Click to expand...
Click to collapse
You aren't going to get locked out because you are going to get rid of that RoM that Comcast and Verizon have done a number on you got a proceed by a cross flashing your device which is hardware identical to the U1 unlocked device with the US multi-rom which is the XAA ROM available on samfw.com. Search sm-A505U1 then XAA there will be a bunch of cscs in most every us provider but that's what the xaa multi-rom does.. it gives you an unbranded device and then when you put in that Verizon sim you should switch you over automatically.. in other words with a SIM card from Verizon you should end up with the VZW CSC accordingly... But if not you can use the two methods one of Sam key you certainly welcome to have another credit or two if you need them. You're not going to break your device or leave it permanently locked and you're not getting much utility out of the damn thing anyway as is but I've done Chimera on flashing I've done all sorts of crazy things to the Samsung devices and you really they're pretty hard to break if you really really know what you're doing and how to restore things even from the Qualcomm edl mode I mean that modem is always listening for something you got to cross flash to that XAA ROM once you've done that with patched Odin your device will for all intents and purposes be exactly like the unlocked device that somebody bought directly from Samsung in the first place. I'm not going to attach the xaa ROM for obvious reasons but here's the correct Odin.

L!V3_4_XC3SS said:
So thanks for the updating of your ROM and Device specs, and that shed the light necessary for me to understand where we are at with your device...
So the reason this has happened is because this was an originally carrier locked - model U with only a specific carrier's ROM prob the Xfinity CCT - that's the only thing it could give you as far as a CSC which is why SamKey didn't get it done for you. I'll be happy to give you another SamKey code but you won't need it - and I'll also give you a different corrected code for entry intp the menus for the second methodology I spoke about as well...
To fix this situation you'll need:
A copy of the Raymond patch version of Odin which is 3.14.1 3B Patched you can search or here's one place -- https://odindownload.club/odin-3-14-1-patched-modded-for-windows/
It needs to be patched even though you're flashing stock FW because you're going to crossflash a U device to a U1 rom which is fine 'cus it's the same hardware but full official Odin still wouldnt' allow it. This will allow you to flash a rom to your device with the XAA CSC which the multi rom... it supports myriad US carriers including the one you want. VZW...
Remember that you're going to want to backup important data before you execute this procedure - you always want to use the full CSC file in the relevant Odin slot when you change a device's ROM not the HOME_CSC (you can get away with it if you're changing CSC on same rom) because you need a wipe to ensure the best possible flash on your device - don't dirty flash the U1 ROM in an attempt to avoid backup & keep your data it will bring problems down the road.
Take out your sim before flashing the new rom
Flash your SM-A505u device with the orginal CCT CSC to a u1 (originally unlocked) device with the XAA CSC as follows:
Download the latest XAA rom for the sm-A505U1 device
here's one place that usually does a decent speed download:
https://samfw.com/firmware/SM-A505U1 then go choose XAA in the CSC box,
If you did it today this would be the latest ROM https://samfw.com/firmware/SM-A505U1/XAA/A505U1UESCCUD2
I usually recommend the latest unless you have some reason you don't want to increment your bootloader or etc. not usually relevant.
You have the patched ODIN from above, already, so now you DL the latest rom for the U1 device with the XAA CSC (American Multi-rom has a bunch of US CSC's
Extract the ODIN, unzip the Rom zip file into its parts - run the ODIN find the unzipped roms pieces and put them where they go -- except home_csc won't need that one this time. Reboot phone into download/odin mode adb reboot download at the adb prompt ought to do it 4u, and then when it comes up you can flash the rom... as i stated above
After a successful flash/reboot change CSC to VZW by rebooting after you insert the sim card of your preferred network and then it should change you over to the new CSC appropriately. In your case VZW (Verizon) should be on point.
If for some reason it doesn't, I'll give you another samkey credit or you can go for the 2nd method you won't need any credits - enter the service mode by
*#*#197328640#*#* instead of my first code and let's see where that gets us...
You could use this same situation for an international A50 device but you'd have to sub the correct ROM for your region..
Sorry this one was a little convoluted but we'll get there... Maybe I'll come back and clean it when it works for you so it will be more useful to others.
L4XS
Click to expand...
Click to collapse
Yay! success at last. I can't thank you enough. Did what you said, it flashed fine, and inserted my Verizon sim, and the phone switched right over. Phone works, for data, text and voice!
Interestingly enough, the APN section of settings is still greyed out for adding or editing APN's, but since everything is working, I can live with that.
Best of all, no more Xfinity Mobile branding on the phone!
Thanks a million.

android94301 said:
Yay! success at last. I can't thank you enough. Did what you said, it flashed fine, and inserted my Verizon sim, and the phone switched right over. Phone works, for data, text and voice!
Interestingly enough, the APN section of settings is still greyed out for adding or editing APN's, but since everything is working, I can live with that.
Best of all, no more Xfinity Mobile branding on the phone!
Thanks a million.
Click to expand...
Click to collapse
I'm glad you were able to achieve a good outcome finally brother just had to fully understand where we started before we could get to the finish line-
FYI, I think in this case the grayed APN's are because it's actually being managed by Verizon's high permissioned carrier specific app which has the ability to enable/disable settings which it wants to take over itself and manage this 4u - they will send out configuration info over the air and your device will make the adjustment automatically with no intervention required from Joe User. Verizon is notorious for thinking they know better and doing this sort of thing - Xfinity that you had before runs entirely on the VZW network so you probably had the same thing there... you might be able to get em with an management app or a hiddensettings app if you really want to play around with your APN's but Verizon's thing actually does a pretty good job of keeping you on the network at a decent speed - most people wouldn't be able to improve on the verizon privileged app and it's management anyway so there's not much upside to making minor tweaks.
Hope you enjoy your sojourn on the Verizon network
L4XS

Howdy all-
I have a similar situation....I have a Galaxy A50 that was previously on Xfinity mobile. I just unlocked it with the code Xfinity provided but it is not working on US Mobile for me. No voice, text or data. USMobile tech support says it could take a day or two to "fully" unlock but I think that is a crock of $hit.
I can't change APNs and Network Operator is greyed out and says Xfinity Mobile with the new US Mobile SIM card installed.
It's my son's phone and I really do not want to wipe it to make it usable on US Mobile. Any way to adjust the settings without wiping the phone?

ClockerXP said:
Howdy all-
I have a similar situation....I have a Galaxy A50 that was previously on Xfinity mobile. I just unlocked it with the code Xfinity provided but it is not working on US Mobile for me. No voice, text or data. USMobile tech support says it could take a day or two to "fully" unlock but I think that is a crock of $hit.
I can't change APNs and Network Operator is greyed out and says Xfinity Mobile with the new US Mobile SIM card installed.
It's my son's phone and I really do not want to wipe it to make it usable on US Mobile. Any way to adjust the settings without wiping the phone?
Click to expand...
Click to collapse
So you have an unlocked phone orignating with Xfinity Mobile -
I'll tell ya that's a complete crock of **** - just a phone rep not wanting to ruin his call stats actually trying to solve your problem - they don't have the knowledge to do it anyway so don't worry about it. So you want to get it to work on US Cellular's network without any love - which version of Android is it running? 10?
Tell me what it says in the APN if you have access to APN settings... What I'm asking is does it have any correct settings for US Mobile, or is it still pointing to the Xfinity servers (Verizon) because that could very well be the issue is that your phone needs to be provisioned on the network.
I assume your US Mobile sim is active, just not connecting in that hardware? type into the Samsung dialer (Phone) if you haven't changed anything, *#4636#* put another set of *# #* on the outside if you're using google dialer, shift the cell info refresh rate toggle to immediate, and tell me which toggles are set to provisioned. Go ahead and scroll down to the bottom, trigger a carrier provisioning event there and let's see if that gives us anything.

Thanks for taking the time to try to help me out.
I can get to the APN setting screen but when I get there, all that I see is that it says " Access Point Name settings are not available for this user " . I cannot add or edit anything like I have done on other phones (like my GS9 for example).
It is running Android 11 and I 'unlocked' it using the code provided by Xfinity Mobile although it seems the code does not fully unlock the thing.
I'm trying to get it to work on US Mobile by the way NOT US Cellular (they are different, right?)

Obviously we
ClockerXP said:
Thanks for taking the time to try to help me out.
I can get to the APN setting screen but when I get there, all that I see is that it says " Access Point Name settings are not available for this user " . I cannot add or edit anything like I have done on other phones (like my GS9 for example).
It is running Android 11 and I 'unlocked' it using the code provided by Xfinity Mobile although it seems the code does not fully unlock the thing.
I'm trying to get it to work on US Mobile by the way NOT US Cellular (they are different, right?)
Click to expand...
Click to collapse
Yes they are certainly different US Mobile is an MVNO that operates on Tmobile and Verizon, so thanks for making that clear. OK so your phone is unlocked for network but Verizon/Xfinity (operates on Verizon network exclusivey) like to mess around with their roms and there's a secondary lock sometines on these devices which greys out the APN - they dont want the end user to be able to mess with it... first of all do you have the option to reset the APN settings? Sometimes that will push it out as it did for the OP of this thread. I'm not sure I've ever seen a viable solution to access this greyed out APN so type in the code *#4636#* in the default samsung phone dialer and down at the bottom trigger carrier provisioning and see if you can get US Mobile to push out a new APN to your phone first of all. Sorry for the double post - thought the first one was lost. Had a connectivity issue myself... LOL

ClockerXP said:
Thanks for taking the time to try to help me out.
I can get to the APN setting screen but when I get there, all that I see is that it says " Access Point Name settings are not available for this user " . I cannot add or edit anything like I have done on other phones (like my GS9 for example).
It is running Android 11 and I 'unlocked' it using the code provided by Xfinity Mobile although it seems the code does not fully unlock the thing.
I'm trying to get it to work on US Mobile by the way NOT US Cellular (they are different, right?)
Click to expand...
Click to collapse
Yes they are indeed 2 separate providers, the one you are trying is an MVNO which operates on T-Mobile and Verizon - so good news at least the device is compatible... LOL... so put in the code that I edited my first post to show you *#*#4636#*#* in the google dialer, or if you still have the default Samsung phone app take off the outside set of *# #* and tell me which toggles are on, you can change which bands it operates on, do a ping test for data connectivity, and down at the bottom you should be able to trigger carrier provisioning - do that please, pull the simcard, put it back in, then reboot your device and tell me if any connectivity was restored first of all - that would mean the APN was pushed out by the network to your device. Verizon & Xfiniity have a secondary lock on the APN they **** around with their ROMS so people have a hard time using a device on another network. Annoying. But we'll get it. Let me know where we stand.

Well...I have used that code before on other phones to find out how it is locked etc. When I put it in on the A50, absolutely nothing happens now, unfortunately. I did do the code before the phone was unlocked and the phone was still on Xfinity, and the only lock that was present was the carrier lock. When I got the unlock code from Xfinity and started the phone with a new SIM from USMobile, I did get the prompt for the unlock code and entering the provided code seemed to get me past the Carrier lock. But...still in my current OP situation...

That second prompt when you put in the US Mobile Sim is deceiving - that's what we wanted... 000000 or 123456 probably would have done it - I think it's the same as the SPC (Service Programming Code) there is almost no research in this area that I've been able to find outside of my own, and I'm limited in what I can do because I'm not in possession of an A-50 with the problem so if we get this you're helping others by bearing with me.
Of course the obvious thing that could be done is to just fflash the multi-rom with the US Mobile CSC included, like we did above, but that still won't unlock the APN - it's just likey to populate it with the correct values from the carrier. To do that properly would wipe your son's A50
So let's try to unlock this as it's the first best choice...
Go get this and tell me what it says on the status of your sim - should be nework unlocked but it may show the secondary protection.
Network/WIFI Info & Sim Query - Apps on Google Play
Get all details of your Mobile Network, WiFi & Sim Information.
play.google.com
This should give you a good shortcut into the APN settings to check and see if you can 1. reset to default if that will give you connectivity, and 2. Add an APN when we unlock the phone
APN Settings Shortcut - Apps on Google Play
1 Tap to open APN settings. This is shortcut app. Minimum ad. No Permission.
play.google.com
As there are a lot of folks who didn't find this obscure thread who will be happy if we figure it out. Let's try the easy stuff first and then I'll get into the ADB command line stuff and tools and codes if we can't get any love with this . So first let's try to clear the prompt "This user not allowerd to change APN Settinggs, etc.::
Make sure that you are in the range of a known Wifi Network and follow the next steps:
Turn on Wifi and wait for your phone to connect to it
While connected to the Wifi Network, reboot the phone
As soon as the device restarts it will automatically connect to the previous Wifi network
Go to APN settings following the above-mentioned path and check if you are now able to view/edit
OR
Turn Wifi ON
Go to Settings -> Mobile Networks -> Network Operators
A search will be executed and afterward, the list will be populated with one or more Network Operators
Choose the Network Provider from where you bought the SIM card
Go to Access Point Names and add the new APN
Save the data and done.
OR
With Wifi on pull your sim and reboot the phone - once booted reinsert your sim and see if it asks for a code....
Try 000000, if that doesnt' work try 123456
If none of that works We will make the attempt to access the APN settings using ADB which is the command line Android Debug Bridge... if you don't have it installed there are guides on how to do so all over XDA, the ADB shell runs not quite as root but at a much higher privilege than the normal user account, so we'll try it from there if none of those work. I 'm sorry I don't have the device or I'd come back with a definitive how to - but for now we'll have to go trial and error, guarantee we'll figure it out, it's I know Samsung devices in general and they're not that different. Many roads my friend.
ADB
Service Mode Codes
My toolbox has utilities that will get it 4 certain if need be.
L4XS