If you are the owner of a Samsung Galaxy Note 3, 2, S4 or S3 and you bought a handset that was locked to the carrier you might now want to unlock it to take the device to a carrier of your choice. You can now do this very easily via a leaked code that allows you to unlock your handset free of charge.
Anyone with a Samsung Galaxy Note 3, 2, S4 or S3 can now unlock their device and take it to whatever carrier they want by following the steps outlined below.
One: Insert a new SIM card into your Galaxy Note 2 or Galaxy S4.
Two: Turn off your device then turn it back on again.
Three: Head to the dialpad and enter in *#197328640#.
Four: Choose  UMTS >  Debug Screen >  Phone Control >  Network Lock > Options  Perso SHA256 OFF.
Five: Wait for 30 seconds or so before heading back into the main menu by choosing “back”.
Six: In your main menu, you’ll see “Network Lock”, so now choose  NW Lock NV Data INITIALLIZ.
Owners of other Samsung devices including the Samsung Galaxy Note 3, 2, S4 and S3 have said that they have used this code to unlock their handsets.