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Samsung Galaxy S4 unlock

The Samsung Galaxy S4 is one of the best Android smartphones currently available!

Before you proceed to unlock your new Galaxy S4 phone (Warnings!!!):

  • unlocking your Galaxy S4 might void it's warrantySamsung S4 Unlock Screen
  • playing around the carrier lock is risky process
  • unlocking your Samsung Galaxy S4 phone is an unauthorized process.
  • I recommend you to proceed at your own risk only

This method applies to Samsung GT-I9505 only, and not to other variants of Samsung Galaxy S4 phone.

  1.  - dial *#0011#  on your Galaxy S4
  2.  - accesing the ServiceMode: menu button followed by the back key, then, hit the Menu button again, select KEY INPUT, enter "1" and press the OK
  3.  - press menu button one more time and tap back again, select  [1] UMTS.
  4.  - select the DEBUG SCREEN [1] and PHONE CONTROL [6], from the next screen, select NETWORK LOCK [6].
  5.  - select PERSO SHA256 OFF [3] .
  6.  - go back to Main Menu, select  COMMON [6] menu item, and then NV REBUILD [6].
  7.  - full reset of your Samsung S4 device

Unlocking your Samsung Galaxy S4

I found an alternative unlocking process on XDA Developers, allowing any Samsung Galaxy S4 SGH-M919 (with T-mobile carrier) owners to unlock their device:

  1. dial *#27663368378# for the debug service menu.
  2. In ServiceMode, select UMTS [1]
  3. UMTS MAIN MENU, select DEBUG SCREEN [1]
  4. DEBUG SCREEN, select PHONE CONTROL [6]
  5. PHONE CONTROL, select NETWORK LOCK [6]
  6. NETWORK LOCK, select PERSO SHA256 OFF [3]
    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 COMMON [6]
  14. In COMMON screen, select NV REBUILD [6]
    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 Restore Back-up [4]
    The button lights for menu and back should come on, and the phone will auto reboot in a few seconds.

How do you know whether the unlock is successful? upon installing a diferent SIM card from another provider, there will be no pop-up dialog asking for an unlock code. If the Samsung S4 is unsuccessfully unlocked, an unlock code prompt will appear.

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