So I'm on 3g, 3.0, tmobile. I do NOT have the t-mobile data plan. I can surf the net only when I am connected via Wi-fi I get the E (edge) sign, but it doesn't do anything for me. However, I have noticed that the google map app picks up my location wherever I am - regardless of wi-fi access. Also, if I am at home and look up an address through wi-fi - then start driving - the dot follows my location and moves with me -- even though I'm not on any data plan. How is this?