Incase anyone didn't know, the sim card does work in every other phone and is removable. I just took mine out (need to put a paperclip in the sim tray and pry it out) and then you can pop your sim back in any other phone. The guy at AT&T told me this was not possible and that if I wanted to have a different phone (weekends, bars etc.) that I would have to add another line or get a go-phone and use call forwarding. For everyone out there, just pop it out and go. Also, everything else works on the iphone without a sim card, the ipod etc.