I currently have an iPhone 3gs (which isn't upgrade eligible), and I'm on a family plan with my wife (who doesn't have an iPhone). I'm thinking of having my wife buy an iPhone 4 (because she'd qualify since she's not under contract at the moment), and then switching phones with her (so I get the iPhone 4 while she uses the iPhone 3gs). But since 3gs uses a normal sim and the iPhone 4 uses a microsim, I'd have to find some way to turn my sim into a microsim and turn her microsim into a normal sim. 1. Will AT&T do this kind of sim swapping for me if I visit one of their stores? Or is it more complicated than that? 2. Also, if there are 2 iPhones on a family plan, will the cost be the same as what I'm paying now, except an extra $15/month for the minimal data plan on the second iPhone? Thanks for any help.