I'm thinking of getting a G2 with a prepaid data plan, which means I'd like to use as little data as possible. I spend the majority of my time where I have wifi access, yet me iPhone will still use 6-10 megs in a week if it never even leaves the house. I assume this is because when it's locked, it checks for new mail, events, etc over 3G, not wifi. How is the situation on Android? Can I still expect to use 40 megs a month even if I never browse the web away from home? Are there ways to get that number down? I plan on setting up gmail and my calendar on my phone. I'm not likely to set up sycing to Facebook, Twitter, etc.