Hi there, I am finding in as little as five days into my month I'm getting the text from o2 saying that I've used up all my data. No, I don't sit watching YouTube all day on it and automatic downloads are off etc... About half of my friends on o2 are experiencing this problem. I installed Onavo to monitor my data and it's nothing like o2 says. Most the time I'm in WiFi anyhow. When I contacted o2 they claimed that the iPhone uses loads of "phantom data" and basically blamed the iPhone. But if it is the iPhone then how come this same problem doesn't exist on orange etc...? Are you having this problem on o2? Have you had any luck resolving it?