Just got my iPhone4 up and running tonight. Transferred all my iPod apps and games, and it's great! Now I am thinking of buying GPS for my iPhone. I have a question: Example: I use the GPS non-stop for an hour. 1. Is this using my voice minutes or my dataplan? 2. Does it use the whole hour?. or, Does it simply log on to update data and then log off? 3. And, BEST ESTIMATE, how much time/data will my hour of GPS use? Thanks, DocTerry PS I asked this same question on a different forum and all I got were recommendations on which application to get!