I plan on preordering 2 iPhone 5's one for me and one for my wife. We are currently on AT&T and want to keep our numbers. Do I port the numbers during the preorder or wait till we get our Verizon iPhones and then call Verizon and have the numbers ported? I've heard people have ported before receiving their phones and their current number is immediately disabled or shortly after the preorder is placed. Thanks.