Hi there, I have an iPhone 4 on O2 Pay & Go. I've noticed that since I've had it (About 3 months) my credit would gradually decrease. I've been keeping a check on it now and noticed today that as I was playing Bejewelled 2 (using an offline game mode) all of a sudden I got a message pop up saying that I'd not be charged for 3G as I had just used £1 of data, even though as far as I'm aware I'm not using any data! This was also while on a train with free wifi. I'm just wanting to use my phone for entertainment more than anything else. I never phone anyone and I send about 5-10 text messages a month, so £10 should last me a long time. Unfortunately this is not the case... As of today, I have switched my iPhone 4 to Airplane mode, hoping that this would cut any sort of data transferring. But is this also blocking calls and messages? (I don't really understand what it does) I can confirm that while I am not using my phone, my credit remains perfectly intact. It's as though I'm actually using internet features without meaning to do so, so could you suggest any way to make sure I don't actually have apps trying to connect? I have apps such as Windows Live Messenger, Facebook, Twitter etc. is there a chance these apps could stay active after I return to the home screen? I noticed the app store alert me that I needed to update an app while I was out, also. Any help or suggestions? Sorry for the looong post!