Scenario: I currently have the iPhone4, my wife has the iPhone 3G. I pre-ordered the iPhone4s, but did the pre-order on my wife's account (but I paid for the upgrade). My plan is to give my wife my iPhone 4 and I will have the upgraded iPhone4S. From a SIM card perspective, all I need to do is take the SIM card out of my iPhone4, put it in the iPhone 4s when it arrives. Will the iPhone 4s come with a new/blank SIM card? If so, I just put that in my old iPhone 4 that I'm giving to my wife and go through the normal activation, right? I just want to make sure I have this straight.