Develop Bugs

H620 on Fido network

I have an unlocked H620 to be used for data on the Fido network (Canada). I am running on WM6.5 with the ROM 3VO.2.50.080809
on the GPRS settings I indicated both wap.fido.ca and internet.fido.ca with username/pass: fido/fido but I cannot connect!
also tried with/without indicating the IP 205.151.011.011 (this is the one sent by a Fido CSR in a txt message) but still no luck
any ideeas, please?

From what i been searching Fido is now Rodgers i think your search could be considerably better with that criteria.
"I may be wrong as i'm only going on what i read"

G_luck
I'm using Fido with the same smartphone and I think the problem is the network Fido don't let you access for any URL is you use Google map application you will see that you have access to the Internet I lost 20$ from two days just using this application , I'm sure it you try fido.ca it will work if not ask support services again
Hope this can help

Take it into Fido and they will set it up for U.

[Q] Droid incredible 2 verizon phone unlocked to t-mobile!!!!!!!!!!!

hi so i recentlly got a droid incredible 2 and unlocked it to use on tmobile. now my question is can 3g be enabled to use on tmobile network?
i have it working on edge so far but it love to take advantage of the 3g network . plz help!!

Congratulations, you have posted in the wrong phone forum. Also, I don't believe you would have access to T-Mobile 3g unless the Inc2 supported their AWS 3g bands.

figured id post in the wrong place and thanx il check out if it does support the bands

No problem. According to this site:
http://www.gsmarena.com/htc_droid_incredible_2-3938.php
the Inc2 supports gsm 2100 which I believe is one of the same frequencies of T-Mobiles 3g network. I can't help you any further since dealing with frequencies and other networks isn't something I know of.

Can it be used with att? Like say with the straight talk e71 sim card ?
Sent from my Incredible using XDA App

OP, how do you make it work? Have you verified with Tmobile sim card? I unlocked hinc2, but it shows "no service" with tmobile sim under GSM.

el6006 said:
Can it be used with att? Like say with the straight talk e71 sim card ?
Sent from my Incredible using XDA App
Click to expand...
Click to collapse
yep it can be used with any sim carrier. just do not know if it will support their 3g data because the adr6350 opperates on frequency 2100 and not also the 1700

hurstian said:
OP, how do you make it work? Have you verified with Tmobile sim card? I unlocked hinc2, but it shows "no service" with tmobile sim under GSM.
Click to expand...
Click to collapse
you have to set up a new apn for t mobile. you have to go into settings-wireless and networks- make sure you have it set to gsm not cdma to make it work. - go to mobile networks- GSM/UMTS options. - acces point names and if its blank press the menu button on the phone and select new apn.
this is what you need to write in it.
Name: T-mobile or whatever you want
APN: epc.tmobile.com
proxy : blank
port: not set
username: blank
pass: blank
server: blank
MMSC:ht tp :// mms.msg. eng. t-mobile.com /mms/ wapenc (without the spaces)
MMS protocol: Wap2.0
MCC:310
MNC:260
Authentication type: blank
apn type:blank.
and this shuld enable your tmobile on your htcInc2
hit the thanx button if this helped

Help switching over
raulplete said:
you have to set up a new apn for t mobile. you have to go into settings-wireless and networks- make sure you have it set to gsm not cdma to make it work. - go to mobile networks- GSM/UMTS options. - acces point names and if its blank press the menu button on the phone and select new apn.
this is what you need to write in it.
Name: T-mobile or whatever you want
APN: epc.tmobile.com
proxy : blank
port: not set
username: blank
pass: blank
server: blank
MMSC:ht tp :// mms.msg. eng. t-mobile.com /mms/ wapenc (without the spaces)
MMS protocol: Wap2.0
MCC:310
MNC:260
Authentication type: blank
apn type:blank.
and this shuld enable your tmobile on your htcInc2
I've been trying like crazy to get mine switched over from Verizon to T-mobile and was soo happy to find this!! I'm having a problem finding my apn numbers and that data listed. When ever I try to switch mine to GSM or Global it say there is no SIM card installed and automatically switches back to CDMA. How can I stop this or how can I change the info another way. I have it rooted already and I'm running the ClockworkMod. The phone doesn't have service but I have activated the Tmobile card already, just can't get the bloody thing to work!
Any help you can give you'd be extremely appreciated.
Click to expand...
Click to collapse

Madwheeler21 said:
...I've been trying like crazy to get mine switched over from Verizon to T-mobile and was soo happy to find this!! I'm having a problem finding my apn numbers and that data listed. When ever I try to switch mine to GSM or Global it say there is no SIM card installed and automatically switches back to CDMA. How can I stop this or how can I change the info another way. I have it rooted already and I'm running the ClockworkMod. The phone doesn't have service but I have activated the Tmobile card already, just can't get the bloody thing to work! Any help you can give you'd be extremely appreciated.
Click to expand...
Click to collapse
Did you get this as a pre-owned phone from someone else? Is it Sim unlocked - do you know?
If the answer is yes, when you go into APN - you need to create the above and SAVE it first. What ROM are you running?
I've uploaded 2 *.jpg images - not sure if it's showing up correctly? Can you reference & compare the screens and share what yours are?

Letitride said:
Did you get this as a pre-owned phone from someone else? Is it Sim unlocked - do you know?
If the answer is yes, when you go into APN - you need to create the above and SAVE it first. What ROM are you running?
I've uploaded 2 *.jpg images - not sure if it's showing up correctly? Can you reference & compare the screens and share what yours are?
Click to expand...
Click to collapse
No this was my phone to begin with. I just got tired of Verizons BS and switched to the Walmart Family mobile that is a third the price, but I couldn't afford a new unlocked phone.
I did manage to unlock the Sim, called Global Support from Verizon and they gave me the code no questions asked.
After I unlocked it and got it to recognize the Sim card I found the APN section and got all that setup like it was shown on here now it's working perfectly!
I'm running the stock ROM. I would like to upgrade to CM7 or something like that but I don't know how to upgrade my Kernal to accept the upgrade so I get stuck at the White HTC boot screen whenever I flash a new ROM. So I just defaulted back to 2.3.4 til I can figure it out.

Madwheeler21 said:
No this was my phone to begin with. I just got tired of Verizons BS and switched to the Walmart Family mobile that is a third the price, but I couldn't afford a new unlocked phone. I did manage to unlock the Sim ... now it's working perfectly!
I'm running the stock ROM. I would like to upgrade to CM7 or something like that but I don't know how to upgrade my Kernal to accept the upgrade so I get stuck at the White HTC boot screen whenever I flash a new ROM. So I just defaulted back to 2.3.4 til I can figure it out.
Click to expand...
Click to collapse
Great, glad to hear that you got it working on Walmart's T-Mo family plan now, it is "slow" on mobile data but just as good when you are on WiFi. We retired our 2 DI2 last month and ditched Big Red, I hear ya - we saved 50% each month, more than enough to pay for two Nexus 5.
If yours is rooted/bootloader unlocked with CWM, you don't need to do anything with the stock kernel - just leave it alone, find the custom rom's zip file that you want - copy to mSD card, boot into recovery - do a full wipe, flash & reboot, then setup as usual & restore your apps. The stock VZW rom has all the bloatware that are useless, especially on other carriers - use Andy Bone's stocked Rom instead, or SkyRaider's Zeus or TSM Sense, all 3 of them works 99.89999% in GSM (using 2 of them now) - read the FAQ / Sticky first, as it is detailed & explained it all with how to's. I have those roms in offline storage - PM me if you cannot find a working public links to download them.
Prices for brand new 4G LTE smartphones are mad crazy, I understand - VZW wanted about $300 each to upgrade + fees + ETF & 24 months contract, if you shop around when ready on eBay, you can find some pre-owned ones that are solid with custom Rom, and reliable with reasonable prices on the 3G HSPA side, i.e. saw pre-owned Motorola Atrix 4G with 4" screen in good conditions for about $70 - in exchange, you get much faster 3G/HSPA+ speed with mobile data (if you need it on the go)
Have a safe & happy holiday.

Skyraider is probably one of the best sense roms on gingerbread with a few tweaks to it. Thing with unlocking the sim on this phone to work on a different network u will eventually start to have issues since it was designed for only verizon cdma and global gsm only. A lot of the gsm is still in the work. When unlocking any phone to work on a different network ur mostly always gonna have an issue with 3G bec gsm is on a totally different band and unless the phone itself was designed specificially for gsm itll be an issue ull more than likely have. An apn change might fix it but not a lot of roms have the apn settings unless its more the line Cyanogenmod. There is an apn settings shortcut in the playstore u can use to set it. Me personally i wouldve stuck with Verizon because the majority of the worlds population is cdma service towers and tmobile has less coverage then sprint or at&t but too each his own. Good luck and hope the apn change helps gain u 3G

No Unlock Prompt

Hey guys,
I'm knew to these forums and I just made the switch from an iphone to the galaxy s3. My dad is with Rogers and he gave me his Samsung Galaxy s3 i747m. I'm with Fido and I purchased a unlock code from cellunlocker.net. The issue I am having is that when I put in my foreign sim card there is no prompt that asks for me to insert an unlock code. Can anyone help me out?

Might sound silly but did u reboot.
Sent from my SAMSUNG-SGH-I747 using xda premium

rail205 said:
Might sound silly but did u reboot.
Sent from my SAMSUNG-SGH-I747 using xda premium
Click to expand...
Click to collapse
Do you mean just powering the phone on and off? Yes I did that already and I've tried these codes from the dialling screen:
#7465625*638*UNLOCKCODE#
#0111*UNLOCKCODE#
#7465625*638*#

Fido, being a Rogers subsidiary, might not need an unlock for a Rogers phone. (Just an educated guess on my part.)
Is the SIM working for you? Are you getting network access? If so, can you find another SIM to try (perhaps enlist a friend's help), and if not, are you perhaps on a non-stock ROM, most of which have issues with the unlock screen?

smelenchuk said:
Fido, being a Rogers subsidiary, might not need an unlock for a Rogers phone. (Just an educated guess on my part.)
Is the SIM working for you? Are you getting network access? If so, can you find another SIM to try (perhaps enlist a friend's help), and if not, are you perhaps on a non-stock ROM, most of which have issues with the unlock screen?
Click to expand...
Click to collapse
I think this is actually the case. I get a signal but my data/3G/HSPA doesn't really work...I read somewhere its probably because my SIM card has been on an iphone for so long that I need to get a new one. Do you think this would help?

You need a different SIM
I went through the same problem (trying to unlock my Rogers S3 for Fido). Because Fido and Rogers are sister companies, a Fido SIM won't bring up the prompt. The phone will work for voice on Fido but not for data until you unlock it.
You need to run out and get a prepaid SIM for a different carrier (I chose a Bell one), or put one in if you have one lying around. The Bell SIM cost me about $10.50. Reboot with that inserted, and the prompt will come up where you can enter your code. Then, you can reboot with your Fido SIM inserted and all will be well.
If you can't get data at that point, make sure the APN settings are correct for Fido. You'll be good to go at that point.

EndlessBliss said:
I went through the same problem (trying to unlock my Rogers S3 for Fido). Because Fido and Rogers are sister companies, a Fido SIM won't bring up the prompt. The phone will work for voice on Fido but not for data until you unlock it.
You need to run out and get a prepaid SIM for a different carrier (I chose a Bell one), or put one in if you have one lying around. The Bell SIM cost me about $10.50. Reboot with that inserted, and the prompt will come up where you can enter your code. Then, you can reboot with your Fido SIM inserted and all will be well.
If you can't get data at that point, make sure the APN settings are correct for Fido. You'll be good to go at that point.
Click to expand...
Click to collapse
Thanks, I'm going to try and put in my friend's Telus SIM card and hopefully that works later today. Your post was very helpful/encouraging, thanks!

Glad to be of help. Let us know how it works.

FPCPineapple said:
Thanks, I'm going to try and put in my friend's Telus SIM card and hopefully that works later today. Your post was very helpful/encouraging, thanks!
Click to expand...
Click to collapse
Click the member's "thanks" button if it was helpful to you!!

EndlessBliss said:
Glad to be of help. Let us know how it works.
Click to expand...
Click to collapse
Hey so yeah I got the unlock prompt to come out. What APN settings? My data is still kinda messed/doesn't work.

Go into System Settings, then More Settings -> Mobile Networks -> Access Point Names
Sometimes, "Fido Internet" or "Fido LTE" shows up automatically. If it doesn't, click the Menu button, then Add, then use the settings found on this page:
[I'm not allowed to post links, so Google fido apn settings unlocked device, and click the first link]
Go to "How to configure an Android device." Don't use LTEMOBILE.APN unless you have LTE in your area. When you're done entering, hit the Menu button, then Save, and make sure it's selected in the list. It should start working right away!

EndlessBliss said:
Go into System Settings, then More Settings -> Mobile Networks -> Access Point Names
Sometimes, "Fido Internet" or "Fido LTE" shows up automatically. If it doesn't, click the Menu button, then Add, then use the settings found on this page:
[I'm not allowed to post links, so Google fido apn settings unlocked device, and click the first link]
Go to "How to configure an Android device." Don't use LTEMOBILE.APN unless you have LTE in your area. When you're done entering, hit the Menu button, then Save, and make sure it's selected in the list. It should start working right away!
Click to expand...
Click to collapse
Thank you so much that was really helpful. Everything is good to go now!

Excellent. Enjoy.

Galaxy S4 4.4.2 NB4 won't send MMS or receive em =/

I got this phone for my dad, as he had this old crappy phone for years and overpaid for his cell bill every month for minute plan lol i know.
So i got him this Galaxy s4-m919 model to find out that it was upgraded as part of a plan, then the person claimed it they lost it to sell it to another person, and ofc they wouldn't refund me.
So i took another path and came on here to get help, ofc it was a T-mobile phone, so I guess i'm blacklisted on t-mobile networks, but i flashed to 4.3 modem, did sim unlock, then flashed back to 4.2.2.
Put in my new Att sim card, and service has worked ever since, the lame part is now he wants to use MMS, and it keeps on failing to send/receive, when he recieve a mms from someone, it comes up as a huge ass url(you have to click it to see the picture in the browser or w.e, but never ever loads rofl, idk y.)
He doesn't use any apps, he just uses it for calling, internet at times, navigation, wants to use MMS, takes pictures/video, etc. But MMS doesn't work, I ever called the H2O to help me, and they said that i needed to change my "Message Center #" for it to work, seriously? My other phone has "+12063130004", and my dad's is "+13123149810", i think H2O rep wanted me to change it to the # my other phone has which is the first number i listed. Is this really the care? If so, how can I change it? =/

First thing to check, in my opinion, is to see if all the APN options are set correctly. Settings \ Mobile Network \ <more> APN Settings will usually get you there. The ATT APN settings can be found here but you may need to search around if H2O requires different ones. I'm on standard ATT and the settings at that link work for me, with my M919 phone.
Good luck!
Marc

Frankenscript said:
First thing to check, in my opinion, is to see if all the APN options are set correctly. Settings \ Mobile Network \ <more> APN Settings will usually get you there. The ATT APN settings can be found here but you may need to search around if H2O requires different ones. I'm on standard ATT and the settings at that link work for me, with my M919 phone.
Good luck!
Marc
Click to expand...
Click to collapse
Just tried ATT Phone APN settings, and my internet nor MMS work; yeah H2O has a bit different settings then att.
They're:
name: h2ointernet (doesn't do anything but eh)
APN: att.mvno
proxy: not set
port: not set
server: not set
MMSC: http://mmsc.cingurlar.com
Multimedia message proxy: 66.209.11.33
Multimedia message port: 80
MCC: 310
MNC: 410
Authentication type: not set
APN type: *
APN roaming protocol: IPv4
Turn APN on/off: on
Mobile virtual network operator type: none
I also saw somewhere that you can hook up your phone to the computer and change the Message Center # using Root Explorer(just re-read the post on xda about this and u have to have it rooted =/), then 'SilverEdit' to edit the xml to enter the message center number?( also heard it wasn't permanent either, if u turned it off, or battery died or w.e. it would revert to the previous #, not sure tho) Not sure what to do here. The internet works fine, but H2O rep says i need to change my Message center number to a different one for mms to work. Also tried changing default msging app to hangouts and sending a mms, and it came up with " mobile plan blocks MMS." I also put his sim card into my working phone, and ofc the message center # was the same when i switched it over to my phone and ofc it won't send, says "mms not supported by network, service response error"

Anyone?

Can anyone help me with "Message Center"? My MMS doesn't work, can't send or receive(when i receive an mms, it comes as a big ass url something like "viewmymessage.com/webgui/bla bla/ bla bla/ and so on/", can't open the link on the phone.

If you have AT&T service on a t-mobile phone it needs to be unlocked. He is using it to call people, so I guess it is. You should try flashing an AT&T modem.
Before that, try making your APN type: IPv4 or IPv6. And MM message proxy:0

I'l try that, just put in my H2O settings: APN type: IPv4 or IPv6. And MM message proxy:0; Can't try atm, as for some reason his data went down to 0, even tho he wasn't even using internet for anything on his phone...which was weird. The way I unlocked this phone was flashing the 4.2.2. modem, then went thru "service mode" and did step by step. If the Apn settings you gave, wouldn't work, would flashing the att modem 100% work(got link for the modem, cba to find it atm, last time if flashed it, i used odin)? I'm on 4.4.2 Android version, Baseband: m919uvufnb4.

Den Den said:
I'l try that, just put in my H2O settings: APN type: IPv4 or IPv6. And MM message proxy:0; Can't try atm, as for some reason his data went down to 0, even tho he wasn't even using internet for anything on his phone...which was weird. The way I unlocked this phone was flashing the 4.2.2. modem, then went thru "service mode" and did step by step. If the Apn settings you gave, wouldn't work, would flashing the att modem 100% work(got link for the modem, cba to find it atm, last time if flashed it, i used odin)? I'm on 4.4.2 Android version, Baseband: m919uvufnb4.
Click to expand...
Click to collapse
You're with AT&T on a Tmobile phone right? You should still need to have an AT&T modem. In the slot where it says "APN type", put it as IPv4 and the slot below "APN type", put it as IPv4, also. But non of that is worth trying if you are using AT&T service. You need AT&T modem and APN settings.
Edit: I was watching a movie and read you comment wrong lol. Yes you need to flash AT&T modem and APN

Kriptik210 said:
You're with AT&T on a Tmobile phone right? You should still need to have an AT&T modem. In the slot where it says "APN type", put it as IPv4 and the slot below "APN type", put it as IPv4, also. But non of that is worth trying if you are using AT&T service. You need AT&T modem and APN settings.
Edit: I was watching a movie and read you comment wrong lol. Yes you need to flash AT&T modem and APN
Click to expand...
Click to collapse
No problem, I was just wondering, is it safe to use other carriers modem onto T-mobiles phone, yet using At&ts modem(diff carrier), some people said it could screw up your IMEI or w.e rofl. I found the modems for i335 which is Att here: http://forum.xda-developers.com/showthread.php?t=2496517

Den Den said:
No problem, I was just wondering, is it safe to use other carriers modem onto T-mobiles phone, yet using At&ts modem(diff carrier), some people said it could screw up your IMEI or w.e rofl. I found the modems for i335 which is Att here: http://forum.xda-developers.com/showthread.php?t=2496517
Click to expand...
Click to collapse
I think you are safe.

Kriptik210 said:
I think you are safe.
Click to expand...
Click to collapse
Ahh okay, so I can just flash ATT NI1 KK modem(9/18/14) modem thru odin and i'm good? ;p
Off-topic, if you flash to att modem and you already unlocked your phone or w.e., nothing gets effected, once unlocked, stays unlocked eh?

Kriptik210 said:
You're with AT&T on a Tmobile phone right? You should still need to have an AT&T modem. In the slot where it says "APN type", put it as IPv4 and the slot below "APN type", put it as IPv4, also. But non of that is worth trying if you are using AT&T service. You need AT&T modem and APN settings.
Edit: I was watching a movie and read you comment wrong lol. Yes you need to flash AT&T modem and APN
Click to expand...
Click to collapse
Actually, be careful with this. The modem (which is two parts) has to be paired with the phone model. For example, an M919 can't use the modem from an I337. The Modem runs the radio hardware, which varies by phone. ATT & T-Mo variants have different antennae bands supported, so need somewhat different radios. I'm not sure if trying a different radio will brick anything, but numerous threads have said it doesn't work. The modem consists of the modem.bin (the "GSM Modem") which can be flashed at will, and the non-hlos.bin ("LTE Modem")which needs to be paired with the phone bootloader, or else chaos ensues.
You DO need the right APN settings. Unfortunately, I have no experience with the message center thing... can't help there.
Marc

Den Den said:
Ahh okay, so I can just flash ATT NI1 KK modem(9/18/14) modem thru odin and i'm good? ;p
Off-topic, if you flash to att modem and you already unlocked your phone or w.e., nothing gets effected, once unlocked, stays unlocked eh?
Click to expand...
Click to collapse
Your phone will still be unlocked regardless. Try to change the APN setting to AT&T first. Like Frankenscript said, both phones have different radios so changing the modem might not work.
Frankenscript said:
Actually, be careful with this. The modem (which is two parts) has to be paired with the phone model. For example, an M919 can't use the modem from an I337. The Modem runs the radio hardware, which varies by phone. ATT & T-Mo variants have different antennae bands supported, so need somewhat different radios. I'm not sure if trying a different radio will brick anything, but numerous threads have said it doesn't work. The modem consists of the modem.bin (the "GSM Modem") which can be flashed at will, and the non-hlos.bin ("LTE Modem")which needs to be paired with the phone bootloader, or else chaos ensues.
You DO need the right APN settings. Unfortunately, I have no experience with the message center thing... can't help there.
Marc
Click to expand...
Click to collapse
I seen people say it works and others say it didn't. Nothing about bricking the phone tho but I do understand what you are saying.

I tried ATT settings, didnt work. I put on H20 settings that were on the site, didn't work. Tried my bros H2O settings that he got from chat rep on their site, then 4G started working, but I keep getting "Mms failed, server error" or w.e. keeps failing, put the H2O internet settings(on), and mms settings. Not sure if his phone is missing something or because his phone is blocked on tmobile's networks, his using H2O meaning his on ATT's network.(i bought him a cheap 1$ mirco-sim, off ebay) Not sure if that plays any role, the calls are good, dats works now, etc, just mms wouldn't work. Suggestions? Some1 on H2Os rep side said it could be the "message center #", that's y it can't be sent or receive or w.e.(His is atts message center #, and its greyed out"

Anyone know how to fix mms problem?(cant receive or send atm, tried a lot of things). Mms keep failing, server error, not supported by network or w.e., lost on wut else to do.

Anyone?

Den Den said:
" then the person claimed it they lost it to sell it to another person,"
Click to expand...
Click to collapse
This is the root of your problem, buying stuff from other people, it's probably stolen.
Throw it away and go buy a new phone from Att and this issue will go away.
Somethings fishy here.
Pp.

PanchoPlanet said:
This is the root of your problem, buying stuff from other people, it's probably stolen.
Throw it away and go buy a new phone from Att and this issue will go away.
Somethings fishy here.
Pp.
Click to expand...
Click to collapse
Cell 4 sale store was selling it, not just a random person. I guess they probably either do it themselves ir buy it from ppl who do it.(upgrade their phone to gs4 or w.e. then claim it lost or stolen, thus keeping their old one and selling the new one) I think they probably flashed it to work for internation, but idk, might've been rooted before 4.4.2, since ota got installed, means root is gone. Anyway to fix the problem instead of just replying with a negative reply? I want to use the phone, calling etc works fine everywhere, 4g is a bit in some places, mms doesnt work at all, one rep at h2o said it might be cuz of message center number, he wanted me to change it to a diff one and see if it solves it or not, but my message center is greyed out.

Apparently there is something wrong with it, at least you should be able to get it replaced for one that works. It could be a build.prop issue. Just guessing.
Pp. Good luck.

Still looking for a solution, anything I could try, to fix Mms to work again?(cant send or receive as it says "server error", failed mms, etc)

Unusual Solution for APN settings that can't be edited normally

If you have a phone which needs APN settings modified for it to function fully this may be of interest. In many cases you can simply go into Settings > Network > Network and Internet > Mobile Data and add an APN or edit an existing APN.
However in some cases you may find as I did that the SIM / phone combination does not allow you to edit or add APN settings. If you have root their may be ways to edit the APN configuration files directly. However with Android 10 and some other situations that becomes difficult if not impossible. In my case even the phone network service support could not update the APN setting. I knew what the APN settings needed to be but since I had an unrooted Android 10 device (a smartwatch in this case but it will work for phones also) I could not get access to folders to edit the configuration and it is unlikely it would have been saved due to Android 10's read only system partition.
On this device I had cellular phone calls and text working but NO Mobile data. I could see the APN settings were not correct for the service I was on for Mobile data to work. I tried everything for days to edit but it was grayed out and I could not add a new APN. In the process of pursuing a solution I found that putting in a different SIM (in this case a Textnow SIM for their new free phone service through Sprint) that I could edit the APN settings when that SIM was inserted. So you will need to find a SIM card that will allow you to edit settings.
Now the real trick involves hot swapping SIM cards so if you aren't comfortable with that then you won't be able to do this. There seems to be differing opinions on this but no phones or watches or SIM cards were damaged when I tried this.
What I did was edit the other SIM by changing the APN settings. Then when I hit the back key it said something to the effect the settings were not allowed on this. At that point I pulled out the SIM with the device ON. I then put back in the SIM for my service provider with the device still on. The settings showed up now on my formerly uneditable SIM ! Mobile data now worked fine. I
I had a second device I wanted to put the SIM in (identical to the first device) hoping the settings would still be there but they were not. Apparently communication between the SIM card and the phone gets APN settings transferred to the phone or watch. So I wanted to do the same procedure on this second device. In attempting that it did not seem to be working the same at first. However after trying for about an hour it finally worked on the second device also. So persistence pays off if it doesn't work at first. I kept turning things on and off in the Mobile data settings, rebooting and playing around with developer options. I wish I could say exactly what got it to work on the second device or why it just worked on the first device the first try but I haven't been able to pin down the variable which achieved success.
But the conclusion is that is you can't edit your APN settings normally you may have success with this method if you keep at it a bit. Good luck and please post here if you have success with this method and share any insights into how you got it to work for your device.

I know I'm a little late your one man party here. I just wanted to finally clear the air on this once and for all. So that every one can edit any and every so called "locked APN" for whatever carrier and or devices. So here we go. First off long time telecom cyber security engineer.
Step 1: Find all the APN's that your specific Carrier used for your Sim card and device. Write them down or screen shot them. Some carriers and devices may only use 1, others 2-3 +.
Step 2: Click and add another APN just as the 1 that is locked on the device. Option for option identical and click save. If you have only 1 APN. It should have now saved, unlocked the APN and you should have 2 identical. You can now go back and edit the APN that you just created. If not or you can't it usually means you have more APN's to add before they will unlock. Ultimately allowing for deletion. Have patience as this may require a little time of trial and error. Good luck all and have fun with it.

daniel081483 said:
I know I'm a little late your one man party here. I just wanted to finally clear the air on this once and for all. So that every one can edit any and every so called "locked APN" for whatever carrier and or devices. So here we go. First off long time telecom cyber security engineer.
Step 1: Find all the APN's that your specific Carrier used for your Sim card and device. Write them down or screen shot them. Some carriers and devices may only use 1, others 2-3 +.
Step 2: Click and add another APN just as the 1 that is locked on the device. Option for option identical and click save. If you have only 1 APN. It should have now saved, unlocked the APN and you should have 2 identical. You can now go back and edit the APN that you just created. If not or you can't it usually means you have more APN's to add before they will unlock. Ultimately allowing for deletion. Have patience as this may require a little time of trial and error. Good luck all and have fun with it.
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Thank you so much for sharing. Worked perfectly.