Hi. I am planning to buy an iPhone 4S, but I wouldn't like to be on a contract with a carrier. Boost mobile has very great deals, and I've heard of people that have been able to use their iPhone on it. Boost uses Sprint towers, and I believe the same baseband. It uses CDMA, however, I believe you can get a SIM card for it. IDK, I just saw it on their website, under 'Activation'. I've looked all over the internet, but I haven't found any hard evidence, if you know what I mean. Is there any way to achieve this? A way to change your ESN, or something like that?(Which, before anyone yells at me, is not illegal anywhere in the US.) Or if I buy an unlocked iPhone 4S, will that work with a SIM card? Thanks for any help!