Anyone have any experience porting their number via the apple online store? Looking to switch from Verizon to ATT for the 5S. Option A) It appears you can get a new ATT plan and port the number right away, however would that auto-cancel my Verizon service immediately? Would not want to be without a cell between the order and phone shipment. Option B) Sign up for a new ATT contract and number and then port later after I receive it? Does ATT allow this or charge any additional fees? Thanks in advance!