I am planning to buy an Iphone but, I have a few question and whether those could be addressed or not. I already have Verizon but I woun't be giving up my verizon number as I need that number. So I plan to use the Iphone as a backup phone. Can I use prepaid cards so that I am not stuck with the 2 year ATT contract. Also can I use it in other parts of the world just by slipping in a new SIM card from that country. So is this possible at all. Can I get a unlocked iphone or can I unlock an Iphone. Thanks for you help.