How to Unlock Network of SGH T999 on CM12.1? - T-Mobile, Samsung Galaxy SIII

hi,
is there any way to unlock sim card on SGH T999??

To sim unlock, the phone needs to be running a stock Samsung dialler in order to enter the unlock code.

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[Q] SIM Unlock Code From T-Mobile Not Working For T999L

I requested and received a SIM Unlock Code From T-Mobile for my S3 T999L (LTE version). However it does not work. I have tried 4 times. Questions:
1. Could it be possible that the code is correct but the "PERSO SHA256" setting is set to OFF? That's the setting from the *#197328640# ServiceMode trick. I did try to unlock the phone using *#197328640# unsuccessfully. I read somewhere on the internet that it should be ON to unlock using SIM code. Are these two really related?
2. How many more times do I have to enter the SIM code before it is permanently locked?

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

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.

[Q] Will a custom ROM eliminate network lock?

Bought a D851 and when I go to SIM unlock process and I tap Service Provider Lock I get a message "Your phone is not personalized." Will a custom ROM carrier unlock a phone? I can enter a SIM network unlock PIN however.
No. You would still have to get it unlocked by T-Mobile.
OK. Thank you.

sm- p607t tmobile unlock

p607t unlock
i havep607t tmobile i unlock sim card in cellunlocker.com its working but no wifi and bluetooth my friends told me that must root it to get full option he did but after that its locked again give me massege this is unauthrized software so sim card unlock how i get original case make it unlock again its didnot ask to unlock code

How to unlock the phone without no-AT&T SIM card

have Samsung Galaxy s7active g891a locked at at&t have no sim card how to unlock without sim number ?how to get unlock number ?my imey 351713081002043

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