I ordered an iphone 4s from AT&T with the 2 week wait time. In the mean time I went into a non corporate AT&T store and they had 1 in stock. They told me to call att and cancel my online order and it would free the system up so I could buy it in store. I called and att said that my order was cancelled. I activated the in store phone and all was good. A week later my original ordered iphone came in the mail. I want to know if I can activate this phone by replacing the sim on the new phone and use it with another iphone 4 sim on my contract that's not available for an upgrade now or return the phone to the store?