I currently am on Virgin Mobile, and have been with them for many years. My bill is $27 a month after tax, 300 minutes, unlimited text and data. But of course the phones are pretty lame. And I really want something to sync up nice with my Macbook Pro, so I'm looking into the iPhone. The only way I can justify the higher cellphone bill is if I get the 200MB data plan (and 200 text package), otherwise the monthly cost gets to pricey and I can't sell myself (or my wife) on it. A good majority of the time I'll be home (wifi), and I have a wifi router in my office at work I have set up as well. So I do see most of my data activity being over wifi. But since I've never had a phone capable of so much, able to use data over 3G, I have no idea how much data I can expect to be using while out and about. My gut feeling is I'll use much less than I think I will, as again, most of my activity will probably be over wifi. But who knows. I know 200MB is NOT a lot. And maybe I can bump it up to 2GB at some point, but for now I just want to know if I'll be screwing myself by limiting myself to 200MB. How much do you all use? And is most of your data activity over Wifi?