I want to bring my New Zealand-bought iPhone 3G to the US for an extended holiday. As I understand it, iPhones bought in NZ are genuinely "factory unlocked" - they work with any SIM card. Have I got that right? My question is: what will my options be when I get to the States? I want to be available and to make calls, but I don't want to pay huge amounts for data since I will be within WiFi reach 95% of the time. Will I be able to just buy a SIM card from any carrier and use my iPhone to make calls as if it were any other type of handset? Can it be a pay-as-you-go SIM card or do I have to have a plan? I've tried to this up all over the interwebs but I'm really confused. Can someone on the ground over there who understands the US carriers etc please give me some tips? Thanks heaps, really appreciate it!