I understand that 3g and wi-fi are different things. The wi-fi part works fine. If i'm at home or work or a wi-fi area and have the password it works and i can access the internet.

If i'm not in a wifi area or don't have the password but want to access the internet the iphone should do this via the 3g or edge network although it doesn't. This is the problem i'm having and wondered it anyone could take the trouble/time to talk me through. I can't even find a 3g menu on the phone?