So I want to get a 3G iPhone, but the 3G service isn't really in my area (yet). What I'm wondering is if I will still be charged as if I am using the 3G service even if I have it turned off on the phone? For example, the data plan on iPhone right now is what, like 20 dollars? And supposedly it will be 40 dollars for the 3G service. If I'm not using 3G, is it reasonable to assume that I would not be charged as such?