Patent ID: 6871069

Claim:
A method for managing a foreign mobile subscriber in a visitor location register (VLR) of a mobile switching center (MSC) to provide a roaming service, comprising the steps of: (a) upon receipt of a call request from a mobile terminal, determining whether a subscriber of the mobile terminal is a foreign mobile subscriber by checking a mobile country code (MCC) and a mobile network code (MNC) of an international mobile subscriber identification (IMSI) number received from the mobile terminal; (b) determining whether roaming service is established for a country of the foreign mobile subscriber by checking if a number of a country code received from the foreign mobile subscriber exists in a country code index table of the VLR when the subscriber in step (a) is determined to be a foreign mobile subscriber; (c) determining whether the service provider of the foreign mobile subscriber is a roaming service provider by checking a service provider index table after determining that roaming service for a country of the foreign mobile subscriber is established by checking the country code identified in step (b); and (d) providing service to the foreign mobile subscriber while managing the corresponding number in the order of the country code index table number, the service provider index table number and a mobile station identification number (MIN) after determining that the service provider of the foreign mobile subscriber is a roaming service provider identified in step (c).