Well, my dad got a new phone, and he wants to reset all his settings to factory defaults. He's went in to the Settings, and it asks him for the Phone Unlock Code. He has never set a code, and I doubt any of his friends @ work have. We've tried "1234" "0000" "4321" and what I found on an AT&T forum post: "111". We have no idea what else it could be, and he has NOT set one. He got the phone, and hasn't messed with anything in the "Security" section