Right so I convinced my dad to use his eligibility for an AT&T upgrade to buy an iPhone 4, which he's going to give to me. They'll get another upgrade in Sept. then we'll be able to do Facetime while my family and I are overseas. I'm just not sure how to activate it without compromising his existing AT&T SIM (lest the Blackberry he's still using cease to work). I will put my temporary (cut to size - done this before successfully with iPad) AT&T SIM card in for the time being, then I'll figure out how to JB/UL when I leave the country in early August. My point of confusion was that even when we tried to put an iPad Micro SIM in the iPhone 4 (just to play and test) iTunes still knew the phone was associated with his account. Input really appreciated! Thanks MacRumors collective!