Could anyone tell me what happened when you swapped your bad phone for a new one? I want to know what they did with the SIM card issue. Did they merely swap the cards and do nothing else? Or did you have to go home and do something in iTunes (if so, what did you have to do?) I ask because: I swapped an activated/working iPhone SIM into a new unactivated SIM and all I got was the same "you have to activate with AT&T" message. The iPhone didn't work. I really need to get this to work for me and I'm puzzled as to what I must do. I assume Apple did some type of magic to the new phone besides merely swapping the SIM??