Hey all, I'm brand new here and I've got a quick question. I'm on Verizon with an iPhone 4S. I plan on getting the iPhone 5 through a friend's upgrade on AT&T. I want to pre order the phone and have it sent to me, from AT&T, and activate it on verizon since I assume it's a world phone and any SIM card should work with it, correct? Or am I missing something? Thanks!