How to SIM unlock Samsung Galaxy S4 SGH-M919 (works)

 

How to SIM unlock Samsung Galaxy S4 SGH-M919 (tested - works)

 

Here are the steps:

1. Goto phone dailer, and enter *#27663368378# for the debug service menu.
2. In "ServiceMode", select [1] UMTS
3. In "UMTS MAIN MENU", select [1] DEBUG SCREEN
4. In "DEBUG SCREEN", select [6] PHONE CONTROL
5. In "PHONE CONTROL", select [6] NETWORK LOCK
6. In "NETWORK LOCK", select [3] PERSO SHA256 OFF
   It should show:
   SHA256_ENABLED_FLAG[1]
   SHA256_OFF => SHA256_ON
7. Now touch the first line SHA256_ENABLED_FLAG[1]
   It should show:
   MENU NOT EXIST
   PRESS BACK KEY
   Current Command is 116631
8. Now press the menu button and select "Back"
   It should show:
   SHA256_ENABLED_FLAG[0]
   SHA256_OFF => Not Change
9. Again, press the menu button and select "Back", and you're back in the "NETWORK LOCK" screen
10. Press the menu button and select "Back", and you're in the "PHONE CONTROL" screen
11. Press the menu button and select "Back", and you're in the "DEBUG SCREEN" screen
12. Finally, press the menu button and select "Back", and you're back in the "UMTS MAIN MENU" screen
13. Select [6] COMMON
14. In "COMMON" screen, select [6] NV REBUILD
    Now you are in the "NV REBUILD" screen, you should see the following text:
    ------------------------------
    Golden-Backup exist
    You can Restore Cal/NV
    ------------------------------
15. Now for the final step.
    In "NV REBUILD" screen, select [4] Restore Back-up
    The button lights for menu and back should come on, and the phone will auto reboot in a few seconds.
    Note: chavxxx's post of selecting "[1] Load default NV" DID NOT work for me.

Congratulations, your phone is now unlocked.