Hi! Okay, so starting in September I will be studying abroad in London until June 2012. My dad, who is on AT&T, has the iPhone 4, but he also has an extra iPhone 3GS that he's not using. He's willing to let me take the 3GS with me to London. Problem is, I only want the phone for local calling/texting in London, not to call home to the US, so I don't want anything to do with AT&T's international data plans. It's not really important to me to use data at all. I just figured that I have a phone that no one is using, might as well take it with me rather than getting one in London. With all that said, would I be able to unlock/jailbreak the iPhone, and buy a pay as you go SIM card in London? Also, how would I go about unlocking it? Thanks!