So I preordered two iPhone Pros... but I am not sure which is which. When I get them, do I just pop the SIM out of my previous iPhone and put it in the new ones or will I have to figure out which number goes with which phone before i set up? In the past, I would see each phone number as a reference number on UPS, but both references are the same phone number. I looked in my order history on Apple, it there is nothing jumping out saying which is which!