of the three iPhones in my flat, my fiances (O2) and my (vodafone) old/2.5g iPhone have Edge signal and work fine. My 3G iPhone cannot connect to safari (except by Wifi). i've tried 3g on or off but i only get 1 bar 3G anyway data roaming doesn't affect it the preset in 'cellular data' is APN: mobile.02.co.uk, user: vertigo, password: password. These were already preset in iPhone. the help section says that only APN is needed so i deleted the user and password and this had no effect either. any ideas?