My daughter is planning to head to the US to work for a while and I may give her my unlocked iPhone 3G. (It's an official unlock from O2 in the UK). Would she be able to get a SIM only iPhone plan from AT&T? I did have a look at the AT&T web site but couldn't see anything like that. Or are there other, better plans from other carriers that offer data and WiFi? Any guidance or suggestions gratefully received.