I recently spoke with an ATT rep, and asked them if I could cancel an iphone data plan if i didn't still own an iphone. They told me I could as long as I was using a dumbphone on that line. Great! I wanted an iphone4 (currently own 3gs), but didn't want the early contract upgrade cost. One of my relatives (on completely different service plan) never gets nice phones. He usually destroys his phones in about a month of use and just buys another gophone to put his current sim into. He agreed to buy an iphone4 upgrade online and cancel the data plan that month so I could use the phone. This exchange seems kind of complicated and I've read some conflicting things about transfers like this. I've read about people doing "upgrade swaps", but those seem to always be on the same account. I don't think this applies to my situation. Questions: 1. Does he need to activate the iphone 4 normally, and then use mini-micro adapter with the new sim for his current dumbphone? 2. Can he completely ignore activating the new sim, and I can put my current 3gs cut sim into the phone? I've read that you can't activate an iphone4 unless it uses the default/new card. 3. If the iphone4 isn't normally activated, will there be any issue with his account, or does ATT automatically start billing for data use after the phone is sold? 4. Ideally, if he doesn't have to activate it at all, could I just go by an ATT store and get a micro-sim for my account? I can cut my sim, but if att will give me a free sim then I wouldn't bother. Sorry if this has been answered before, but I've read so many different answers for different scenarios that I just can't figure it out.