Hi all! I am moving to Spain this summer, and I will be there for a year. I currently have an iPhone 3G, and I don't want to have to buy another phone in Spain. I know that it's possible to unlock iPhones for overseas use, but how does that work?? Would/Can I use a prepaid SIM card after unlocking it? Would it maintain all of it's functionality? Sorry if this question has been asked before, but thanks in advance for your help!!