Method of and a system for establishing presence of a mobile station in at least one dedicated service area of a mobile telecommunications system

A method of establishing presence of a mobile station in at least one dedicated service area of a mobile telecommunications system providing service to a plurality of geographically spread service areas, said method comprising the steps of:

• a) determining whether said mobile station receives service from a telecommunications systems providing service to the or each dedicated service area;
• b) determining whether said mobile station receives service from a service area comprising the or each dedicated service area and, in the affirmative,
• c) triggering said mobile station to provide location information relating to the presence of said mobile station at a location receiving service from said service area comprising the or each dedicated service area, and
• d) establishing presence of said mobile station in the or each dedicated service area by comparing said location information provided by said mobile station and stored location information relating to the or each dedicated service area.