A computer application for preventing a mobile device user from operating a mobile device while operating a motor vehicle. The computer application determines pertinent mobile devices within the motor vehicle. The application provides a user interface to each of the pertinent mobile devices for selecting a motor vehicle operator device. The application causes all pertinent mobile devices to move into a locked configuration if a motor vehicle operator device is not identified and causes non-operator devices to move into the unlocked configuration if a motor vehicle operator device is identified. The computer application causes the motor vehicle operator device to remain in the locked configuration if the motor vehicle is moving and causes the motor vehicle operator device to move into an unlocked configuration if the motor vehicle is not moving, or if the motor vehicle operator device is no longer one of the pertinent mobile devices.