Just got off the phone with AT&T and was surprised what the guy told me about activating my new phone on my line, since I'm using my wife's line on our family plan in order to get the upgrade. He said that all iPhone 5s need to have someone call in for activation, since it's a different type of sim card. And when I call in they will match up the sim card to whichever phone number on my plan I'm using the new phone for. This seems weird - I thought I was going to have to bring the phone in and physically get a new card from the AT&T store in order to switch the line. I figured whatever card was in there was already programmed for my wife's line, So I guess this means I don't turn on the phone and try and activate it first, I call AT&T first? Cn anyone who knows more about this stuff than me confirm that this AT&T guy was actually correct? Thanks a bunch.