The present disclosure concerns a system and method with the steps: detecting of the signal strength of a mobile radio connection between the motor vehicle and a mobile radio network at detected positions of the motor vehicle after determining from the detected signal strength that the mobile radio connection has been interrupted and the motor vehicle has been parked as of this time within a predetermined duration: storing of the position of the motor vehicle in which the motor vehicle was situated at the time of the interruption as a dead spot; relaying of vehicle data to a vehicle-external server device as soon as it is determined, after the storing of the dead spot, that the motor vehicle has approached within a given distance of the stored dead spot; providing of the relayed vehicle data by the vehicle-external server device.