Ok im planning to buy the iPhone 4 pay as you go on O2 (im in the UK so it can happen) and basically theres this Text & Web tariff where it gives you 300 texts and 500mb of data when you top up. What I don't understand is that is the 500mb of data the 3G? Or is that the WiFi? If its the WiFi, then can i not connect to my own Bt-Home-Hub at home and get free WiFi? Im Confused Also is 500MB good enuf for when your not at home if you can use the WiFi at home? Sorry for the confusing question.