so im using my wifes upgrade to get the 5s (but I'm taking it muuuhaaa). anyway i plan on taking my iphone 5 sim and moving it to the 5s. that should work correct? if so, i don't think i can take her iphone 4s sim and put it in the 5 correct? so can i use the one that came with the 5s in the 5 after i activate(again move the original 5 sim) into the new 5s? basically, i want to try to avoid the att store if i can. if i can't, will att charge me for a new sim?