for unlocking your galaxy note 2
Step 1: On the Samsung Galaxy Note 2, launch the phone app and dial the following keys:
*#197328640#
Step 2: From the Main Menu, navigate to [1] UMTS > [1]Debug Screen > [8] Phone Control > [6] Network Lock > Options.
Step 3: In the Options screen, choose [3] Perso SHA256 OFF. After choosing this option, wait for 30 seconds.
Step 4: Now go back one step by pressing the Menu button and then select Back once. You should now be in [6] Network Lock.
Step 5: Choose [4]NW Lock NV Data INITIALLIZ. After that, wait for a minute.
Step 6: After a minute, reboot your Galaxy Note 2.