21stNow wrote:My question, for those familiar with iTunes unlocking, do you have to have a foreign SIM card in the iPhone to initiate the unlock process?
That's a great question. I ulocked a 3G through AT&T last week under this new program. Some people on this forum didn't believe me whan I posted that experience 
I did have an active foreign sim in the phone. When the iTunes update finished up popped a message in ITunes that the phone was unlocked and it found AT&T, the foreign carrier's roaming partner. It also found T-mobile and switched to T-Mob when the AT&T signal was weak.
Don't know what would have happened if I didn't have the foreign sim installed. I'm assuming" the unlock would have worked anyway as an AT&T sim would have activated the phone.