The service contract agreement states, "If your minutes of use (including unlimited services) on other carrier networks ("off-net usage") during any two consecutive months exceeds your off-net usage allowance, AT&T may at its option terminate your service, deny your continued use of other carriers' coverage, or change your plan to one imposing usage charges for off-net usage." Just got an iPhone. I live where there are at&t coverage towers and work (often staying overnight) where there aren't any (but its covered by another carrier). I dont make many calls at work, so I shouldn't exceed my limit on calltime for off net usage (40% of your anytime minutes). But I AM worried about the internet. I read that you can only use up to 6MB of EDGE thru other networks, which is extremely small. Questions: 1. Does this off net usage include the free night/weekend minutes? 2. How does this apply to internet, maps, weather, and email use thru the EDGE network? Is it the amount of data received (and if so, it is really only 6MB)? 3. Does the iPhone automatically use the internet to update weather, check email, etc? If so, is there a way to disable it so I don't risk exceeding my monthly data limit? and related questions: 4. What is the "mobile to mobile calling area"? Can you only make free calls to other AT&T customers if you are calling from an area with AT&T towers? 5. Where is my "calling plan area"? I signed up for the iPhone plan, which I assumed was national. thanks for anyone who can answer my questions so I can understand whats going on!