Embodiments of the present disclosure include methods, systems, and vehicles for disabling a function of one or more mobile devices within a passenger cabin of a vehicle. A method of disabling a function of one or more mobile devices within a passenger cabin of a vehicle according to the present disclosure includes determining a number of occupants within the passenger cabin based on one or more occupant sensor output signals output by one or more occupant sensors. A disable message is sent to disable a function of the one or more mobile devices in the passenger cabin when the number of occupants present in the passenger cabin is determined to be one. A disable message is sent to disable a function of only the one or more mobile devices associated with a driver of the vehicle when the number of occupants present in the passenger cabin is determined to be greater than one.