I know that your shipping and billing address need to be the same for these iPhone pre-orders, and I want to avoid any conflicts or issues by trying to change my order and changing the shipping address after its been placed. I won't be home on the 19th and it's not guaranteed that anyone will be. Does anyone know if you can pre-sign for your iPhone with UPS or FedEx? So they can still leave it and no one has to be physically there to sign for it? Thanks!