Abstract: A method of determining fees for chargeable telecommunications (TK) services, whereby a counting device is used to calculate the amount of charges accumulated by an individual customer during a predetermined billing period, is characterized in that after exceeding a threshold value of the accumulated amount of charges, which can be individually established for the customer by the provider of the TK services, a limited low-fee, preferably a no-fee usage of the TK services is made available to the customer. To announce the start of the low-fee usage, a signal is preferably transmitted to the customer. This contributes to a further increase in the incentive of using the TK service, and causes an increased utilization of the respective TK service system as well as an increase in the service provider's sales.