Hi All, this is my first post, so please be gentle! I have someone who wants to sell me 2 iphone 4 sprint cdma, but i notice that they do not have a sim card slot, he told me there something called "flashing" where i can flash the iphones to another network. I asked around and some people tell me it was illegal and some say it's not. my question is it illegal? and if so, is there any other way that the sprint iphone 4 CDMA can be unlocked to use on another network.