Develop Bugs

Need help unlocking

I need to unlock my wife's S3 and I got the unlock code from AT&T but when I try to do it, it says unsuccessful. The phone is completely stock not even rooted. Can anyone help cause AT&T is useless?

Does the imei match the imei on the phone's printed label?

Yes it does

When you insert a non-ATT sim, you get the prompt to enter the unlock code? If you do and you enter the code provided by ATT based on the phone's imei, sounds like ATT may have given you the wrong code.

audit13 said:
When you insert a non-ATT sim, you get the prompt to enter the unlock code? If you do and you enter the code provided by ATT based on the phone's imei, sounds like ATT may have given you the wrong code.
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Yes then it gives me and sim unlock unsuccessful. I am getting sick and tired of sitting on hold with them

I'm not sure if the s3 gives you a limited number of tries to unlock it but I would not attempt more than 2 attempts each day.
I assume you confirmed the imei # with ATT? Is it possible the phone is hard-locked to ATT? Did ATT give you any other codes such as unfreeze codes, PUKs, etc.?

i know you said stock , unrooted. dont you have to be on 4.1.1 to unlock? prob. are, just asking.
err on the side of kindness

What ROM is on your phone? If it is 4.1.1 or 4.1.2, you could try using the free unlock method.

I'm having the same problem here. Received a code from AT&T on Oct 26th and they're still trying to figure out why it doesn't work. Bought the locked phone at BestBuy and never touched it until I tried to use the code they gave me.

ninaviana said:
I'm having the same problem here. Received a code from AT&T on Oct 26th and they're still trying to figure out why it doesn't work. Bought the locked phone at BestBuy and never touched it until I tried to use the code they gave me.
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What ROM version is on your phone?

audit13 said:
What ROM version is on your phone?
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I have no idea what that is. The phone runs on Android 4.3 if that helps.

ninaviana said:
I have no idea what that is. The phone runs on Android 4.3 if that helps.
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If you were on 4.1.1 or 4.1.2 and the code didn't work, you could revert back to stock 4.1.1 and unlock the phone for free. Since you're on 4.3, you can only unlock the phone with an unlock code. Seems strange that the unlock code doesn't work. Did you confirm you phone imei and the imei you submitted to ATT?

audit13 said:
If you were on 4.1.1 or 4.1.2 and the code didn't work, you could revert back to stock 4.1.1 and unlock the phone for free. Since you're on 4.3, you can only unlock the phone with an unlock code. Seems strange that the unlock code doesn't work. Did you confirm you phone imei and the imei you submitted to ATT?
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Yes, I checked everything. Today I spent almost an hour on the phone with them trying to figure out the problem. They even called Samsung and they didn't know what was wrong either.

ninaviana said:
Yes, I checked everything. Today I spent almost an hour on the phone with them trying to figure out the problem. They even called Samsung and they didn't know what was wrong either.
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Is it possible that the phone has become hard-locked to ATT due to too many unsuccessful unlocking attempts?

audit13 said:
Is it possible that the phone has become hard-locked to ATT due to too many unsuccessful unlocking attempts?
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I read that the phone displays a message when that happens, and none has been presented so far... It always asks me for the network unlock code.

Problem solved
To whoever is going through the same trouble. This is not the "unlock it for free" method, for you will need to insert the unlock code
For Samsung Galaxy S3, S4 and Note 2. Device must be updated to the latest firmware.
Phone MUST prompt for the code. This is the "release method" on the phone(s).
a. Go to the Dial pad and dial *#197328640#
b. Click on number [1] UMTS > [1] Debugging screen > [8] Phone Control > [6] NETWORK LOCK
c. You will see 3 options. Click on number [1] Perso Sha256 INFO, the screen will change slightly
e. Hit the MENU button then when the menu pops up carefully hit BACK to return to the previous screen
f. Click on number [2] Perso Sha256 ON, the screen will change again to a one line message
g. Restart the phone on the screen by holding the power button and click RESTART
h. When the phone prompts for the unlock code simply enter the unlock code
END

Unlock Code

I recently purchased an unlock code from a company online. I finally received my code tonight but I'm unsure how to go about using it to unlock the device. The Device Unlock application wouldn't allow me to enter anything, so I dialed #7465625*638*# and entered the code that way. I followed a few trouble shooting techniques but it still won't work on AT&T. Does anyone have any experience with this using this device? If so, I'd love to hear what to do.

Try flashing a different Rom from another carrier through recovery. Maybe the AT&T rom. I simply put a tmobile sim in the phone and it successfully my phone through the application.

Z51 said:
Try flashing a different Rom from another carrier through recovery. Maybe the AT&T rom. I simply put a tmobile sim in the phone and it successfully my phone through the application.
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Youre saying to flash the stock rom from AT&T? Have you done this? What do you mean you put a TMobile SIM in and it unlocked it..
1. Did you have a TMobile S6?
2. Did you flash an ATT rom to it? Custom recovery or stock?
3. Did you use a code?

Returning to stock rom from CM 12.1 to Android 4.2.2

Hello
I am currently running CM 12.1 on my SGS3 i747m.
I want to return back to stock rom, the current version offered by Rogers is Kit Kat 4.2.2.
Is this considered a downgrade? (from CM 12..1 to Android 4.2.2) Will I brick my device?
Is returning back to stock rom the only way I can network unlock my phone?

1) it is a downgrade in android versions (lollipop to kitkat. not bootloader/modem).
2) no , will not brick your device as long as not downgrading bootloader/modem.
3) what is your current bootloader/modem version ? (if unsure , you can DL the "samsung info" app from playstore and it will tell you).
http://forum.xda-developers.com/showthread.php?t=2609045
here's the xda thread for that.
4) i belive its the only free method. i think you can pay for an unlock code and not have to return to stock.
5) if returning to stock , here are directions posted by @audit13
http://forum.xda-developers.com/showthread.php?p=66306367
"err on the side of kindness"

So you're telling me I do not have to revert back to stock in order to network unlock? =D
That was my only reason for reverting back to the stock rom.

correct. but i've never had to unlock one so i wouldnt know where to go or how much the code cost.
"err on the side of kindness"

***update: i just bought an unlock code
didn't work. my phone says perso lock.
sigh
if i revert my phone back to stock rom, does the recovery have to be reverted too? or it's all good.

Recovery can be custom or stock. You need to revert to the stock Samsung dialler in order to enter an unlock code.
Easiest method would be to flash the latest 4.4.2 stock Rogers rom from sammobile.com, skip through the set up, power off, insert non-Rogers sim, boot phone, enter unlock code, done.

could I install stock rom via recovery or does it have to be through Odin?

so... I tried to install the stock rom via Odin3 as instructed on Sammobile... but it gets stuck in the glowing Samsung logo during boot.
any ideas?

try thru recovery :what:
"err on the side of kindness"

Did you perform a factory reset/wipe in stock recovery before booting the phone with the newly-flashed rom?

audit13 said:
Did you perform a factory reset/wipe in stock recovery before booting the phone with the newly-flashed rom?
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i can't access stock recovery
I pressed power+vol up+home button. nothing.
although i get into download mode

i tried this: http://forum.xda-developers.com/gal...13-nightly-t3356062/post66306367#post66306367
and doesn't help =(

Are there any error messages in Odin? You're flashing the correct firmware?

audit13 said:
Are there any error messages in Odin? You're flashing the correct firmware?
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So I went back to flash the latest stock firmware... and I was able to access the recovery and wipe cache and then factory reset/wipe! it worked!
=D
but I am having the same problem I started. I couldn't unlock my phone.
I entered the unlock code I got from MobileInCanada.com... and it still doesn't work.

I see that there is a free method for Android 4.1.1.
I am currently running Android 4.4.2
From Phone INFO app
Bootloader Version/PDA/CSC/Baseband: I747MWLUFOB3
Do you think I can revert back to Android 4.1.1 and try the free method? Or should I complain to the MobileInCanada about unlock code not working. Seeing as it looks like going back to stock, everything should be easy as pie to network unlock.

So you flashed back to a completely stock rom, inserted a foreign SIM card, you were prompted to enter the network unlock code, and it didn't work?
The imei in the phone matches the imei provided to mobileincanada? I have used mobileincanada but it was a long time ago. I get all my unlock codes from eBay because it's cheaper.
Do not attempt to flash any rom that is 4.3 or older as attempts to do so may hard brick the phone. Once an i747m is running a 4.3 or newer bootloader, the phone can only be unlocked with a code.

audit13 said:
So you flashed back to a completely stock rom, inserted a foreign SIM card, you were prompted to enter the network unlock code, and it didn't work?
The imei in the phone matches the imei provided to mobileincanada? I have used mobileincanada but it was a long time ago. I get all my unlock codes from eBay because it's cheaper.
Do not attempt to flash any rom that is 4.3 or older as attempts to do so may hard brick the phone. Once an i747m is running a 4.3 or newer bootloader, the phone can only be unlocked with a code.
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Yes! completely right! I inserted my foreign SIM card, entered the unlock code from MobileInCanada and it didn't work.
I double/triple checked the IMEI.

Mobileincanada has a very good reputation. I recommend contacting them for a refund or have them resend the code.

Thank you!
would it be a different code?

If you supply the same imei, the code should be the same. Perhaps mobileincanada looked for the wrong imei in the unlock database.

need help finding a stock based ROM

Attached is a screenshot of the relevant info about what I'm on now. What I need to know is what stock based ROM can I flash on this device? I need to unlock it for use on T-Mobile, but the unlock code from at&t isn't working. The only method that has worked for other people when it won't take the provided unlock code is to use *#197328640# to turn on the "Perso Sha256" option, then restart the phone and it should accept the unlock code after that.
The problem is, I'm on a slim/AOSP based ROM so the Samsung dialer codes don't work. So I need to know which Samsung based ROM to flash on this device that won't brick it. Not sure what my bootloader version is, but I can check that if necessary. Someone please help!

The free unlock method only works on a stock 4.1.1 dialler, bootloader, and ROM.
Boot into download mode. Do you see anything about Knox or warranty bit? If yes, you can't use the free method and you'll have to buy an unlock code or convince at&t to give you a code for free.

audit13 said:
The free unlock method only works on a stock 4.1.1 dialler, bootloader, and ROM.
Boot into download mode. Do you see anything about Knox or warranty bit? If yes, you can't use the free method and you'll have to buy an unlock code or convince at&t to give you a code for free.
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You're the second person to misunderstand what I'm asking for lol. I do not want to use the code-less unlock method. I have an unlock code from the carrier. It will not accept the code with Perso Sha256 turned off though, so I need to be able to turn it on so the phone will accept the unlock code from the carrier. CM/AOSP-based roms don't accept samsung dialer codes, so I'm not able to access the menu to turn it on. I'm looking for a stock-based rom that will work with my current baseband so that I can use the samsung dialer codes.

Is the phone a i747 or i747m? It can be confirmed in download mode as it is a very important distinction.

audit13 said:
Is the phone a i747 or i747m? It can be confirmed in download mode as it is a very important distinction.
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It's i747
Though I solved this on my own and I'm going to mark the thread as solved and provide a link to the ROM I used in case someone else has this issue. Using an old 4.3 version of venom ROM I was able to use the Samsung dialer code to turn Perso Sha256 on and after a reboot, the phone finally accepted the unlock code from at&t and immediately registered to the T-Mobile network with data, voice and SMS working perfectly.

There's enewmans's S3 Rx custom ROM based on the Android 4.4.2 stock ROM.

Need help network unlocking, flashed to stock

I got a new phone, the LM-G820UM AT&T version. I followed this guide: https://forum.xda-developers.com/t/tutorial-crossflash-bypass-opid-mismatched-error.4345963/ to flash the stock firmware. With my SIM card in it says "network locked", it doesn't prompt for the unlock code. I have the unlock code and I've tried the various unlock commands (2945#*71001# and 2945#*20001#), but nothing comes up when I do these. Do I need to get it back to the AT&T firmware to be able to unlock it? If so, how can I do this?

gunnerone007 said:
I got a new phone, the LM-G820UM AT&T version. I followed this guide: https://forum.xda-developers.com/t/tutorial-crossflash-bypass-opid-mismatched-error.4345963/ to flash the stock firmware. With my SIM card in it says "network locked", it doesn't prompt for the unlock code. I have the unlock code and I've tried the various unlock commands (2945#*71001# and 2945#*20001#), but nothing comes up when I do these. Do I need to get it back to the AT&T firmware to be able to unlock it? If so, how can I do this?
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wow, yeah, that's unfortunate. First, yes, it's the at&t firmware that the unlock code works with, not any other firmware.
second, at&t doesn't make their kdz available, so you have no easy way to get back to their firmware.
you might get lucky and find someone who has backed up all their partitions from at&t. Then u would flash ea one back via qfil.
Important lesson: don't buy a locked phone. if u get a locked phone, don't to anything to the firmware until u unlock the phone.
cheers

@AsItLies would this phone work in it's current state with AT&T?

gunnerone007 said:
@AsItLies would this phone work in it's current state with AT&T?
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To the best of my knowledge, no. At&t is one of the carriers that has restrictions for their networks. Last I read (have never used them personally), they only allow phones that have their IMEI (they check that), and it's using their ROM, to access volte and vowifi.
so, would it work? yes and no. Volte and Vowifi may or may not be important to you.
Additionally, I'm absolutely no expert with at&t, so u might just try and find out, my info could be outdated.