Milestone 3G?

Hi everyone,

Im not the hottest when it comes to mobile phones, but the other day I got a motorola milestone.
I really love the phone and think its really great, but I cannot find how to turn off the 3g and just use the wifi.
Is this even possible? What it is, I have a limit with vodafone about the about of mb that I can use, and I dont want to get charged for going over this.

I want to be able to use the 3g when im out and about, but when im at home at there is wifi I would rather use that as its free.


So how do I turn it off? Or is it just the case that its always on and the mb usage only counts when I go on the internet?

Sorry if this seems a bit simple,

Thanks in advance

Amy