Unlocking you older Samsung Galaxy Note can’t get any easier now that the unlocked code for the device has been leaked. The code is said to be for the Samsung Galaxy Note 3 although some people have reported that it works on some other Samsung devices as well.
To unlock your Samsung Galaxy Note 2 or Note 3, you will need to start by sliding in a new SIM card. Restart the device after you’ve replaced the old SIM card with a new SIM. Next, open up the dial pad and key in the code *#197328640#.
Now, choose UMTS >  Debug Screen >  Phone Control >  Network Lock > Options  Perso SHA256 OFF. Wait for a least 30 seconds before proceeding. Select Back to enter Main Menu and from there select 4] NW Lock NV Data INITIALLIZ.
Your Samsung Galaxy Note 2 and Note 3 should be unlocked now.