Just a quick question. This will be my first time returning my new iPhone and going back to my previous one. Obviously, I just put the 6 back in its box with everything that came with it and return it to the apple store, but what do I do to activate my old 5s again? Do I just switch the active SIM in my 6 with my deactivated 5s and just return the 6? Or do I just return the 6 and then deal w/ ATT to get my 5s back up and running? Thanks for any help!