If you’ve got a locked Samsung Galaxy Note 2 or Galaxy S3, you can easily unlock it, and for no extra charge, so that you can take your device onto any carrier you like, anywhere in the world.
Say you have a locked Galaxy S3 on Verizon – you’re tied to that carrier, but if you unlock it you can migrate it to anywhere or to anyone you like. You could emigrate with your phone, or send it overseas to a friend of relative. If this is your sort of thing, read on.
To get started, remove your Verizon SIM and replace it with a “foreign” (not Verizon) SIM. Then turn your phone off and on again.
Then you should go into the dialpad and enter this sequence: *#197328640#. Head to your main menu >  UMTS >  Debug Screen >  Phone Control >  Network Lock > Options  Perso SHA256 OFF. You then need to wait for around 30 seconds before going back into your main menu and selecting back. You should see “Network Lock” now. Choose  NW Lock NV Data INITIALLIZ.
The sequence that you should have typed in is “Asterisk Pound One Nine Seven Three Two Eight Six Four Zero Pound”. Don’t forget that some people call the asterisk the star button, and call the pound button hash.
If all’s gone right you should have an unlocked Galaxy device that can be used on any network anywhere. This code’s been around for a while and might work on other Samsung devices.