Hubs and I will be swapping iPhones. We will both have the same size Sims so no problem there. I also know to call AT&T to have the correct IMEI numbers associated with the correct phone, so again, no problem there. My question is, when I do the "Erase All Content and Settings" on each phone, do I do this while the sim cards are still in or do I take them out? Then or course, after the content is all erased I will swap out the sim cards to get them activated on the right phone. I just can't remember if I leave the sim card in while doing the erase or take them out beforehand? THANKS!