So I have 2 lines on my att account that are eligible for upgrade. I used one of the upgrades to purchase my iphone 4 and have activated it. I am looking to purchase a 2nd iphone to sell, and am wondering if I get the iPhone and don't activate it (leave it sealed in the box), will I be affected in anyway when the purchaser activates it? My concern is that when i provide the second phone number that is eligible for upgrade to the Apple store, is this number tied in anyway to the phone if the phone is not activated? I want to make sure that my current SIM will not be deactivated when someone else opens the package and connects the unopened phone for the first time. I hope I am clear with my question, thanks for your input!