I think I have a settings problem. Begin December I switched carrier for my Hero. I went from T-mobile to Ben, which uses the T-mobile net. When I switch on the GPS receiver and start Google Nav or another GPS program, the data connection drops out. If I use a program without the GPS switched on, there is no problem. Right up until I switch on the GPS, then no more data connection. Is there anything wrong with my settings? Or could it be the carrier? I have an unlimited dataplan. Would a factory reset help?