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Samsung Galaxy 5 Mobile Phone Unlocked Black. To use this you need to update your S3 to 4.1.1 Jelly Bean which was released on December 3, 2013 by Samsung: • dial the following keys *#197328640# • Main Menu >UMTS >Debug Screen > Phone Control > Network Lock >Options Perso SHA256 OFF • After choosing this option, wait about 30 seconds, then go back one step by pressing the Menu button then select Back, now you are in  Network Lock then choose  NW Lock NV Data INITIALLIZ: wait for a minute then reboot your phone. (I personally don't have the  NW Lock NV Data INITIALLIZ, but I guess it might help others).