Abstract: A processor responds to first and second specific sequences of data by providing the same first expression. The first and second specific sequences of data are derived from sequences of telephone digits which are typed in by a telephone caller. The first expression is transmitted by the processor back to the telephone caller in a spoken language. The processor first receives a general sequence of data before responding to either the first specific sequence of data or the second specific sequence of data. The processor receives the actual locations of a plurality of telephones in a region. The processor uses these actual locations to produce a first estimated location of a telephone in the region. Distances of the actual locations of the plurality of telephones in the region from the first estimated location are calculated by the processor. The processor then preferably eliminates telephones that are located above a threshold distance from the first estimated location.

Abstract: A portable tracking system that includes one or more portable units for determining their respective locations and communicating it to another unit or to a remote telephone unit. Each unit includes a global positioning system GPS for determining latitude and longitude, a micro-computer, a cellular telephone, and a digital data to voice for converter and batteries.