I'm sorry guys if this has been covered before. I ordered the 5S through AT&T online using an eligible upgrade (199.99 16GB) I sold it sealed and unopened to someone. Will the number that I used to upgrade/purchase the phone be deactivated once the buyer turns on the new 5S? How do I make sure that the old phone number and it's original phone (iPhone 5) stay connected to the ATT network? Thank you!!!!