I have a Visorblade that sits on the ashtray and all I do when I get in the car is switch it on and it pairs automatically, the phone stays in my pocket, to receive a call, it rings, you press a button and talk, when finished just press another. To make a call (only when stationary o'course ossifer :D ), press the same button as picked up the call and it uses voice tags to dial. The battery life is HUGE!
The phone never leaves your pocket.
Dave