How to Sim Unlock Your Samsung Galaxy S4 of AT&T or T-Mobile retailer?

How to unlock AT&T or T-Mobile Samsung Galaxy S4 (SGH-M919 or SGH-1337 or SGH-1337M) For Free?
Unlocking your mobile is a crime in USA. Toxic Hack will not be responsible for any damage caused by you to your mobile or to other. This is for educational purpose only. If you are thinking to unlock your locked samsung galaxy s4, so it is very easy.
You can unlock your SGS4 without paying for it.

This way of unlocking sgs4 works for AT&T and T-Mobile Retailers only
PLease Note that this method is also find working on canadian variants of the galaxy s4 from BELL , Rogers or Telus.

        While the method given below has been tested by many users and they passed but yet i could not guarantee that it will work for you TOO!!.
As the user makes many mistakes while unlocking it's locked mobile or rooting or unrooting, then it may cause failure. So please read the tutorial several times before proceeding to get safe from being failure.

Steps TO Unlock:
                  First of all open the DIALLER in your S4 and write
*#27663368378#. ( if in case this code does'nt work for you then try dialling *#0011# )

Now you will see a screen saying Service Mode
In this carefully select [1]UMTS ( if you are not getting service mode then tab on select left to the home button and select back) Don't use the back button which is at the right of home button.

Then from UMTS menu select [1]Debug screen. Above

After getting into the debug screen menu you have to select [6]Phone Control

In the Phone Control menu you will see a menu Saying [6]Network Lock

Tap on it

In the Network lock menu select [3] PERSO SHA256 OFF.
After selecting it a new menu will open in it select SHA256_ENABLED_FLAG[1]

Tapping on it will show the following message.
Menu Not Exist Press Back key
Current Command is 116631 or 116621

Now tap on the menu button (left to the home button) and in it select Back. (To go back Do not press the back button which is right to the home button).
When you will do this you will see the following lines or tabs on the screen which is saying
SHA256_OFF => Not Change
 As you know that at the place of 0 it was 1  Now it has been changed.

Ignore this and select the menu button and select back again
Repeat this process until you reach the UMTS MAIN MENU.
In the UMTS MAIN MENU you will find an option called
[6]COMMON Tap on it.

Then Select [6]NV REBUILD.

Now in the NV REBUILD menu click or tap the option saying [4]Restore Backup.

Selecting this option will freeze your T-Mobile or AT&T carrier galaxy s4 temporarily.
The screen will turn off, the menu and back buttons will light up and the device will reboot.
This process can take few minutes so be patient and do not press any button till your galaxy s4 reboot completely.

Finally your galaxy s4 will boot up normally and it will be SIM (GSM) locked Hopefully.
To check if it is Unlocked or not try installing the sim of other carrier or network provider.


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Mohammad Ammad

Mohammad Ammad

Some say he’s half man half fish, others say he’s more of a seventy/thirty split. Either way he’s a fishy bastard.