I have an iPhone 3GS 8GB, and I stream the radio a lot on it when I'm at home. Sometimes, when a song that I have on my phone is on, I forget I'm streaming and I leave the range of my WiFi. The other day I went out for a walk and did this. The radio app stopped so I started selecting another song, when it started again. It turns out it was shifting over from WiFi to 3G. here's the thing though: I don't have a data plan. I'm on prepaid. I pay for my service, and I keep no money in my account. Is it typical for AT&T to randomly neglect to block data usage from certain accounts? This has happened multiple times. It's not just the radio either; Facebook, Twitter, email... You name it. I'm getting full data access. Is there anything they can really do about it? My phone has been allowing data since I switched from the pay-per-minute plan to the $25 unlimited messaging/250 minutes plan. Can it come to bite me in the ass, or should I take advantage of it? And has anyone else encountered this? Additional detals: I'm running on iOS 4.3.3, I was jailbroken with Redsn0w, now Jailbreakme. Data came through on both jailbreaks, so I don't think that is the issue. I also notice it's happening when I'm out and about and I get an email or other notification. I am also on baseband 5.16.02.