Apparently Apple checks you wireless account (in my case VZW) after you've ordered your phone but before shipping it to you. And any pending changes to your wireless plan will prevent Apple from shipping phone. No matter how small those changes are (in my case - adding Travel Pass option to an international plan). You'll be given up to four days to "resolve" those or your order will be cancelled. VZW did agree to cancel this change, but I'm not sure how it will affect my order or shipping times. It's not a big deal, but it was an unpleasant surprise. S.