I drive a truck, delivering product from Arcata,CA in the north to Lake Elsinore,CA in the south. I have the phone mounted on the dash so I can see when the company sends me texts of my next pick up or delivery. I drive highway 101 to San Francisco then jump over to I-5 via hwy 580. I have yet to have full service anywhere. Most of the time it's just 2 bars. The company has called several times but the system doesn't hold it and drops the call. Beginning to think I spent all that money on a system that doesn't work.