Patent ID: 8112073

Claim:
A communications system for mobile radio telephony the system comprising: a plurality of mobile devices operable within a total territory of the communication system, the total territory being divided into a plurality of location areas, each mobile device comprising a module insertable into, removable from and distinct from the mobile device, each mobile device being associated with at least one subscriber territory being fixed inside the total territory, wherein the at least one subscriber territory includes at least a portion of at least one location area from among the plurality of location areas wherein said at least one subscriber territory is fixed by data including a location and the radius of a circle surrounding the location as a center, and wherein each module comprises a processor configured to determine whether a respective mobile device is located inside the at least one subscriber territory by checking whether the received coordinates of the at least one location area in which the mobile device is located falls into the at least one subscriber territory associated with the mobile device, wherein said checking step comprises: comparing a received location area/cell (LAC/CI) identifier with pre-stored LAC/CI identifiers to determine whether the received LAC/CI identifier is in the range of the pre-stored LAC/CI identifiers, and determining if the received LAC/CI identifier matches one of the pre-stored LAC/CI identifiers, in the case where it is determined that the received LAC/CI identifier is in the range of the pre-stored LAC/CI identifiers, wherein said pre-stored LAC/CI identifiers are stored in a memory on the subscriber identity module (SIM).