Method for effecting telecommunication connections at low cost and a device for carrying out the method

A method for effecting telecommunication connections for users in a telecommunication system having competing rates, wherein a selection of a rate which is the most economical for the user is made based on data stored in a memory containing competing rates, wherein these rates represent prices in dependence on at least one of the following parameters: starting time of the telecommunication connection, day of the week, holiday, and rate zone. The method is characterized in that the ending time and the duration of a telecommunication connection and the data associated therewith are additional parameters belonging to the above mentioned rate data, the communication connection is switched without previously choosing any single one of the rate and, after the telecommunication connection has been ended, the rate data are used to determine that rate which would have been the most economical also taking into consideration the length of the telecommunication connection, wherein invoicing to the user takes into consideration this most economical rate. In this fashion, it is possible to invoice a lower fee for the conversation to the user.