I take it this is a iPhone you have brought/unlocked and using with a non-iPhone SIM?
have you gone to 'Settings>Network>Cellular Data Network' and added all the setting for your SIM/Network?
got through to 02 and they gave me the right settings. Went into the shop earlier and they were like, you cant do it, you need to change to an iphone tarrif and so on....The people on the phone told me the right answer
yerah its sorted now, just trying to find out if I can sync google calendar with my phone now.