Method for updating subscriber data in a cellular radio system and a cellular radio system

Method for updating subscriber data in a cellular radio system, comprising a home location register and a visitor location register, the method comprising the following steps:

• a home location register restart indication indicating that the home location register has restarted is received from the home location register;
• a subscriber-specific restart number is included in the subscriber data of the visitor location register;
• a home location register list is included in the visitor location register, each home location register identity having an associated home location register restart number in said home location register list;
• the visitor location register changes the restart number of the home location register which sent the restart indication in the home location register list of the visitor location register;
• when the visitor location register receives from a mobile exchange an indication of the establishment of a radio connection with a subscriber, the visitor location register compares the subscriber-specific restart number of the subscriber with the home location register restart number of the subscriber, and initiates the updating of the location data of the subscriber in the home location register if required on the basis of the comparison.