A telecommunications data processing system comprising a terminal (T) adapted to send a telecommunications service request to a telecommunications infrastructure (IT1) associated with a data-storage infrastructure (IT2) for storing data (DE) about the utilization of the telecommunications service. The telecommunications terminal (T) includes means for producing service utilization data (DE), which data relates to the telecommunications terminal (T) and is based on data (DT) contained in an end-of-service and triggering message sent by the data-storage infrastructure (IT2).