Method for automatically detecting the presence of a user equipped with a mobile terminal device in a vehicle, wherein at least a vehicle transmitter, at least a vehicle receiver and at least a communication device for communication with a central computer are installed in the vehicle, the vehicle receiver and the on-board communication device being networked in terms of data technology and the mobile terminal device being connected in terms of data technology to the central computer via a mobile data network, the method comprising the steps: a) repeated transmission, by the vehicle transmitter, of at least one vehicle data telegram, b) receiving, by the at least one vehicle receiver, at least one vehicle data telegram, c) creating, by the at least one vehicle receiver, a vehicle reference data set form the vehicle data telegram, d) sending, by the on-board communication device, the vehicle reference data set to the central computer, e) receiving, by the mobile terminal device, at least on vehicle data telegram, f) creating, by the mobile terminal device, a terminal device data set from the vehicle data telegram, g) sending, by the mobile terminal device, the terminal device data set to the central computer, h) receiving, by the central computer, at least one terminal device data set from at least one mobile terminal device and at least one vehicle reference data set from at least one vehicle, i) determining, by the central computer, the presence of the mobile terminal device in the vehicle by means of the terminal device data sets and the vehicle reference data sets, wherein a vehicle data telegram contains at least one system-wide unique identifier of the vehicle, wherein a terminal device data set contains at least one system-wide unique identifier of the terminal device and a time stamp and wherein a vehicle reference data set contains at least the system-wide unique identifier of the vehicle and a time stamp. the method comprising the steps: a) repeated transmission, by the vehicle transmitter, of at least one vehicle data telegram, b) receiving, by the at least one vehicle receiver, at least one vehicle data telegram, c) creating, by the at least one vehicle receiver, a vehicle reference data set form the vehicle data telegram, d) sending, by the on-board communication device, the vehicle reference data set to the central computer, e) receiving, by the mobile terminal device, at least on vehicle data telegram, f) creating, by the mobile terminal device, a terminal device data set from the vehicle data telegram, g) sending, by the mobile terminal device, the terminal device data set to the central computer, h) receiving, by the central computer, at least one terminal device data set from at least one mobile terminal device and at least one vehicle reference data set from at least one vehicle, i) determining, by the central computer, the presence of the mobile terminal device in the vehicle by means of the terminal device data sets and the vehicle reference data sets, a) repeated transmission, by the vehicle transmitter, of at least one vehicle data telegram, b) receiving, by the at least one vehicle receiver, at least one vehicle data telegram, c) creating, by the at least one vehicle receiver, a vehicle reference data set form the vehicle data telegram, d) sending, by the on-board communication device, the vehicle reference data set to the central computer, e) receiving, by the mobile terminal device, at least on vehicle data telegram, f) creating, by the mobile terminal device, a terminal device data set from the vehicle data telegram, g) sending, by the mobile terminal device, the terminal device data set to the central computer, h) receiving, by the central computer, at least one terminal device data set from at least one mobile terminal device and at least one vehicle reference data set from at least one vehicle, i) determining, by the central computer, the presence of the mobile terminal device in the vehicle by means of the terminal device data sets and the vehicle reference data sets, wherein a vehicle data telegram contains at least one system-wide unique identifier of the vehicle, wherein a terminal device data set contains at least one system-wide unique identifier of the terminal device and a time stamp and wherein a vehicle reference data set contains at least the system-wide unique identifier of the vehicle and a time stamp.