anyone who borrowed a friends iPhone and activated through itunes and switched back to their old phone, did your status change to elegible for upgrade?
I just bought a used iPhone on CL for $250, took it to AT&T for a new SIM card, and activated it on iTunes. My upgrade status on AT&T's website instantly changed from ineligible to eligible. I am sure I can resell this iPhone for at least $250 after I get a 3g next month.
I recently asked the same too. Like if you could just borrow an iPhone from a friend, put in your current AT&T sim, activate on iTunes, then hand the iPhone back to your friend and keep your sim card with an iPhone plan on that account to take to ATT store to buy the new iPhone at a discount.
Will it lock your friend's iphone?
I only know someone at work that has an iPhone, and my cousin is too far away. So I'm not going to risk messing up the account of the person at work. I almost wanted to suggest, I'd buy her old one for $250, then she could upgrade $199. But I'd want to buy her phone and activate it before the 11th to become eligible, but if there's a chance her eligibility is compromised, then the whole plan falls apart.
I just found out, you can always unlock it again free, yourself. Just google unlock iphone and they'll teach ya.