okay my gophone had got stolen and my friend had at&t right.. she already had her upgrade and she has her old phone she said i can use until time pass by.. okay she is on the at&t contract and i'm on gophone. can a gophone sim go into a regular at&t? like if i was to buy just a cheap gophone and swich the sim to regular phone will it still work?? PLEASE HELP ME OUT YALL!! thanks