Many people own a Samsung handset that they purchased with a contract initially but they now want to take it to another provider. There is now a code going around that is going to allow you to unlock Samsung devices and they include unlocking the Samsung Galaxy Note 3, 2, S4 and the S3, plus others.
Most people buy their handset locked as it is cheaper. But then when the contract runs out the handset has to be locked and this means it needs unlocking. Luckily you can unlock your handset with a code that has leaked.
If you do want to go ahead and unlock the Samsung Galaxy Note 3, 2, S4 or the S3 you can check out the steps 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.
If you have followed the steps above you should now be holding the Samsung Galaxy Note 3, 2, S4 and the S3 unlocked. You might also want to try the code with other handsets in the Samsung range.