I sent my iPhone 5 to Apple for repair due to the Sleep/Wake button not functioning. It now is on its way to be delivered to me today. If they were unable to repair it and they send me a refurbished unit, what will I need to do to get it set up? Im on AT&T and have never set up the new phones myself. It has always been done by a clerk at a store on a computer. The phone is backed up on my computer. I did this just before sending it out for the repair. Do I need to contact AT&T to set it up? Do I just connect it to the computer and put the Sim card back in?