Tried searching for my specific situation and couldnt find what i was looking for. Here is the skinny... My wife and I are on a family plan. I have the 4s and she has the 4. I'd like to use her upgrade which is coming up in a few weeks and then give her my 4s. More specifically, i'd like to trade in her 4 at a local retailer and then use that $ toward the 5. From there, i want to have my # setup on the 5 and give my wife my 4s (she could care less about having the latest and greatest). My thought is that i can literally swap SIMS between my 4s and her 4 so it then becomes setup with the wifes #. However if i get the 5 would i need to then go to ATT or call them up to have my # setup on that new nano sim? Will a store like Best Buy be able to hand me/wife and un programmed phone so that i can have ATT set it up with my info or can they do that?