So in the craziness of last night and Apple not coming up for hours I managed to finally get my order in for a Space Grey 128GB 6+, but it's not coming on launch day (7-10 days) and since I'm working on a music tour, I don't really have the ability to receive a shipment without it being risky and going to a hotel. I really need to do a store pickup to get a new phone. I'm planning on camping out in San Antonio TX where we've got a day off the night of the 18th to try and score one on launch day, but my question is - can I buy a phone on AT&T at the apple store on launch day and then cancel my order, or will they overlap and cause issues? I really want to keep my order in just in case I turn up with nothing after the night of camping. Thanks!