I am to be picking up 2 iPhone 5's at the Apple store on 9/21. I also pre ordered one. One of those 2 lines are not upgrade eligible. How would I use another line that is upgrade eligible (which is a basic phone, not a smartphone). Do I just use the eligible line to pick up the iPhone 5 at the Apple store and then go home and call AT&T to have them swap it over to the line I want to use it on without activating it?