There might have been a change over the years. If there was, I didn't keep up with that. I'd like to transfer service from an iPhone 5 to the 6. Is that a simple sim swap or do I have to call AT&T? I'd try swapping sims now but I don't have the old one with me (daughter's phone, other one is at her Mom's. Mom has been slow to take care of it on her account). Recently with my iPad it was just a matter of moving the sim from the old iPad to the new one.