So I'm on an ATT family plan. I preordered an iPhone 5 from Apple.com using my sisters upgrade with the intentions of selling it for profit. She lives out of state and happy with her iPhone 4, so I used her upgrade for the iPhone 5. Upon receiving the iphone, there is the activation screen asking for SSN and zip. I DO have this information, but I don't want to put it in for fear of her CURRENT sim on her iPhone 4 will become deactivated. Then she would have no service and her phone line will become activated on the iPhone 5. Is there a way to ACTIVATE the iPhone 5, WITHOUT deactivating the sim my sister is using in her iPhone 4?? I tried popping in my own nano sim that is currently activated on my own iPhone 5, but I still get that activation screen. I was just hoping popping in my ATT sim would have bypass the activation.