I'm getting an iPhone 3G from a friend and do NOT have a data plan at all. I do have an AT&T plan and have unlimited texting. From what I'm gathering, when I get it, all I have to do is change the APN or get data transfer blocked by AT&T so no data is transferred and I'll be good to go, right? I won't get a crazy high bill next month? I'm gathering this info from another thread, specifically this post: Any help is appreciated. EDIT: If I just throw my SIM into it, use something like iphonenodata.com and block the data, will I be fine?