I went into the AT&T store this afternoon and I pre-ordered two (for my wife and myself) new iPhones 7 plus'. The estimated ship date isn't until 10/7-10/14. My question is... Is it possible to go into the AT&T Store (after they are released) if they have them in stock, can I get them in-store and cancel my pre-order or do I have to wait until the pre-order finally ships? Of course, assuming that they have some in store to sell. It would make sense that I could but sometimes places have strange rules that don't make any sense.