- Switch off your phone
- Insert a new SIM card
- Turn on the device
- Now, enter the code *#197328640# in the dial pad and enter
- Choose  UMTS >  Debug Screen >  Phone Control >  Network Lock > Options  Perso SHA256 OFF
- Now wait for around 30 seconds, and then select ‘back’ to go back to the main menu
- In the main menu, you will find ‘Network Lock’. Choose  NW Lock NV
Incidentally, the code can be used for unlocking many handsets of Samsung, including Galaxy Note 2, Note 3, S-3 and S-4. Try it, and see how it works.