TOOLS:
Microusb
Sgtool

PROCEDURE:

1: Power on your phone.
2: Go to Menu > Settings > Applications > Development (on phone)
3: Switch on the option USB DEBUGGING
4: Connect your phone to the computer. (install USB drivers)
5: Click on Read Unlock Codes.
6: Start your phone with new simcard and enter the code.

TICK: READ UNLOCK CODES

- Starting ADB Server
- ADB Device: GT-I9100
- SW Version: I9100BUKI1 (Android: 2.3.5)
- Phone Imei: 358848042983825
- Checking SU Root Access..
- Rooting phone.. Please Wait (some minutes).....
- ROOT Access: True (Shell)
- Sha1 Hashed codes detected (blk1).
- Unlock Codes:

- MCK: 53935384 (Master Unfreeze)
- NCK: 83713857 (Network lock) [Locked]
- NSCK: 00000000 (Subset lock) [Unlocked]
- SPCK: 00000000 (SP lock) [Unlocked]
- CPCK: 00000000 (CP lock) [Unlocked]
- SIM : 00000000 (Sim lock) [Unlocked]