Need help unlocking my Galaxy S3 for AT&T from T-Mobile - T-Mobile, Samsung Galaxy SIII

So my Galaxy S3 is rooted running AOKP. I have an unlock code from T-Mobile so I can unlock it and use an AT&T SIM card. When I enter the code after booting the device with the AT&T SIM in it, it says unlock unsuccessful.
Do I have to be unrooted & on stock to do this? Or maybe just on stock? Kind of annoying, any help is appreciated!
EDIT: So I figured it out myself. If anyone has this problem in the future, just flash a touchwiz based ROM then reboot and use the unlock code and it should work.

Related

[SOLVED] [Q] Never prompted to unlock sim

At what point should my Dinc2 be asking for the unlocking code? I have a GSM sim and its never asked.
Note: I have already rooted with S-off and I am running a GSM compatible ROM by Aerovan CM9
Update::::
After 2 and a half days of googling I found the answer. You have to access a stock rom and go to System settings>security>disable sim unlock then it will prompt for you to enter in the sim unlock code.
Stock ROM required?
Is a stock image actually required for this?
Thanks,
Paul
Where is that option on S3?
OK, so have stock ROM on S3 now... Cant find that option.. Is it available somewhere else on the S3?
Thanks
Paul
Delete my post, made a mistake. :banghead:

[Q] Un doing the JB unlock trick!

Does anyone know how to undo the unlock trick in JB?
I'm currently on the stock telus rom, unrooted
and am having troubles with my network (AT&T go phone)
and would like to re-lock my device to enter in an unlocked code
because my phone will not accept USSD codes ATM on
the AT&T sim card that I am using...
Can anyone help?
Anyone please help?

Need help unlocking my galaxy s3 !

Hey guys i'm new to this forum but i have been having a very frustrated time i really wanna unlock my FIDO galaxy s3 i know it's not listed here but, i want to unlock to so i can use my rogers sim card can anyone give me any tips how to do this i don't wanna pay for a unlock code
You must be running stock 4.1.1 to use the free unlock method. If you are running 4.3, you will have to buy a code.
If you have to buy a code, you may have to return to stock to enter the unlock code.

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.
Click to expand...
Click to collapse
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?

How to Unlock S3 t999 4.3?

Hi to all, im new on the forum, i was looking to find a way to unlock my S3 t999 which has the android 4.3 JB, i got a lot of info but it seems that i only Rooted my S3, i found out that there an easy way to do it whit the Service mode but since i have Stock 4.3 its impossible, was looking a way to downgrade to 4.1.1 but probably ill get a brick, so if there any way that i get some help unlocking my device i sure will appreciate it.
After 4.1.2 I think there is no free alternative available (unless your carrier gives unlock codes for free after a certain time period). The best way to unlock your phone would be by contacting your carrier for an unlock code which usually means paying a fee or using a pay service. I would recommend using your carrier because they will offer better support and this would reduce your risk of getting scammed by a online service.
Help please!
Hi! Where do I begin?! So I have a tmobile s3 T999LTE version. Previously I rooted it because I wanted custom rom on my phone. Then I wanted to sell it so I unrooted it. I had read somewhere that after unrooting I should revert to latest stock firmware which was 4.3...BIG MISTAKE! It's now running on 4.3...LUVUBOH1 and I CAN'T UNLOCK IT! Tmobile had sent me a code which did not work, then I switched to metro pcs and purchased a code off ebay,which was the SAME code tmobile had given me. I now have metro pcs on another phone and when I put in my current sim in s3 it doesn't prompt for code! And no key combos are working due to change in dialer. I am stuck and gave no idea how to fix it. Imei is valid and I'm pretty sure I'm running stock 4
3. Help anyone? Please? ???
Was the phone running a completely stock rom when you tried to enter the code? How many times did you try to enter the code?

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