I used to have a first gen iPhone unlocked with AT&T. I never had any data plan and only hopped on free wifi spot (at college so they're a-plenty). Anywho, it got stolen a month ago after 2 years of great service. I found another pretty cheap 3G iPhone on craigslist, advertised to be jailbroken and popped a new SIMs card in it. It works very well EXCEPT for the fact that AT&T seems automatically sign me up for a dataplan every couple of days. i wonder; is it that the phone wasn't actually jailbroken OR is it impossible to bypass a data plan on the 3G?