Method in conjunction with updating one or more HLR-databases included in a mobile telephone system

A method of updating a home location register (HLR) database stored in a home location register provided in a mobile radiotelephone system, wherein an update of the HLR database is initiated by transmitting to a visitor location register an update message identifying the HLR database, comprising the steps of:

• storing and updating, in a visitor location register (VLR) database stored in the visitor location register, a time of receipt of the update message;
• storing and updating, in the VLR database, times of contact between the visitor location register and a mobile station;
• searching, at each time of contact between the visitor location register and the mobile station, the VLR database to ascertain whether the mobile station belongs to the HLR database for which an update message has been stored;
• comparing, when the mobile station has been ascertained as belonging to the HLR database for which an update message has been stored, a stored preceding time of contact between the visitor location register and the mobile station to the time of receipt of the update message;
• and
• updating the HLR database with data stored in the VLR database when the stored preceding time of contact is earlier than the time of receipt of the update message.