Hi

I have just got a HTC Desire HD and its great, I have a data usage app and the only thing I'm a bit worried about is that its often using up data over WI-FI and when I go out it'l use 3g instead, the problem is I only have 500mb a month will that be enough?

I have made certain things only update say every 4 hours or so, why is it still using up the data when theres nothing to update?

Hope that made sence lol,
Thanks in advance,