A system for communicating location data regarding the present service area for a "roaming" cellular paging device in a paging system. Each cellular paging device monitors a cellular network control channel to detect a cellular system identification signal transmitted by a cellular mobile ...http://www.google.fr/patents/US5797097?utm_source=gb-gplus-shareBrevet US5797097 - Method and apparatus for identifying the location of a roaming pager
Method and apparatus for identifying the location of a roaming pager
