A method for collecting tolls for location usages of an on-board unit, which has a unit identifier in a road toll system and a mobile telecommunications identifier in a mobile telecommunications network. The method includes storing the unit identifier and the mobile telecommunications identifier of the on-board unit in a control centre of the road toll system, sending the position-fix data from the on-board unit, under the mobile telecommunications identifier as sole identification, to a toll calculation server, calculating location-anonymised toll data in the toll calculation server, and sending said toll data under the mobile telecommunications identifier to a control centre of the mobile telecommunications network, charging a user account assigned to the mobile telecommunications identifier in the control centre of the mobile telecommunications network, sending a confirmation to the control centre of the road toll system under the mobile telecommunications identifier, and retrieving the unit identifier associated with the mobile telecommunications identifier and providing the confirmation in the control centre of the road toll system.