I have an iPhoe 3g, on 3.1.2, with a voice only plan, with all IPX connections blocked. Lately, Fido(my carrier) must've allowed push notifications, because my iPhone gives me the "cannot access data network" message at random times(whereas it did before only when I actually asked it to access data when not on wi-fi). ical is not allowed to fetch data, mail isn't either. I have no apps that allow push notifications that I know of, I deleted the only one(facebook app), but the phone still wants to access data out of nowhere, about once every 5 minutes, it happens especially on the SMS screen, but it may be my imagination. I have not tried resetting the phone or restoring it, though I don't think that would change much. The "pop-ups" telling me I don't have cellular data network are starting to annoy me, and I'm trying to find their source so that I can eliminate them, if anyone has an idea, I'd much appreciate it.