Abstract: The invention relates to a method, which can be used to determine the local itinerary of a user of a variety of public means of transportation. Based on said determined itinerary then the travel cost can be equitably distributed among the individual operators of the means of transportation. The basis of the method is a comparison of the coordinates of stops of the public means of transportation with the coordinates of base stations for sending and receiving operations in mobile phone communication (GSM). Said coordinates must be determined only once and can be stored in a memory. If the coordinates of a base station into which a mobile phone is logged are close to the coordinates of a stop, it is assumed that the user of the mobile phone is located at said stop. During the travel of the user of the public means of transportation, it is detected at regular intervals—for example in intervals of 30 seconds—into what base station the mobile phone is logged.