1. A vehicle communication system comprising: a mobile communication device; and a control unit in a vehicle, the control unit having an OFF state, an ON state, and a LOW POWER state, the control unit comprising: a wireless communication module operable to communicate wirelessly with the mobile communication device; and a power management module operable to command the control unit to enter the ON state in response to each of a vehicle ignition event, a vehicle running condition, an incoming wireless command signal, and environmental stimuli.