Let me start out by saying that I have done a lot of researching, not necessarily on MacRumors as I am new to this site, BUT I have been in contact with Apple and AT&T and have been getting conflicting information. I got my 3GS last summer shortly after release; therefore, I am not eligible for an upgrade until February 2011. However, there are three other numbers/phones on my family's plan that are eligible to be upgraded. I have previously used other lines on my family's plan to upgrade my phone and just swap out the SIM cards. Obviously the new iPhone uses the mini-SIM, which is where I anticipate issues. Basically what I am asking: Can I go to the Apple store and purchase the new iPhone using my dad's upgrade eligibility for the agreement pricing, and either have them switch the number to my phone number, OR would I be able to go to AT&T and get a mini-SIM that I can just put into the new iPhone?