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Method and system for detection of fraudulent cellular telephone use

  • US 5,822,691 A
  • Filed: 05/02/1996
  • Issued: 10/13/1998
  • Est. Priority Date: 05/02/1996
  • Status: Expired due to Fees
First Claim
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1. A detection system for detecting the unauthorized use of a mobile radio telephone unit comprising:

  • at least one mobile radio telephone unit including;

    a first memory means for storing first numeric data representative of a last telephone number connected (LNC);

    a first transceiver means for receiving and transmitting radio telephone communications;

    a first control means;

    a user interface means connected to said first control means for inputting a telephone number by a user;

    said first control means coupled to said first transceiver means for making and receiving radio telephone calls, and transmitting said inputted telephone number from said user interface means, said first control means further coupled to said first memory means for recalling and transmitting said first numeric data representing a last telephone number connected (LNC) and stored in said first memory means;

    a first processing means coupled to said first control means and to said first memory means for and responsive to said inputted telephone number from said user interface means and stored in said first memory means to form said first numeric data representing a last telephone number connected (LNC) each time a radio telephone call occurs;

    a radio telephone network includingat least one base station including;

    a second transceiver means for receiving and transmitting radio telephone communications;

    a second control means coupled to said second transceiver means for making and receiving radio telephone calls, said second control means further receiving from said second transceiver means said inputted telephone number and said first numeric data (LNC) transmitted from said at least one mobile radio telephone unit and received by said second transceiver means;

    a network communication means, coupled to said second control means, for connecting said at least one base station to said radio telephone network, said network communication means including;

    a second memory means for storing second numeric data representative of the last telephone number connected (LNC);

    a comparing means coupled to said second memory means and to said second control means for comparing said second numeric data (LNC) stored and said first numeric data (LNC) received to generate a comparison signal;

    a second processing means coupled to said second control means and to said second memory means and responsive to said inputted telephone number received from said at least one mobile radio telephone unit to form said second numeric data (LNC) which is stored in said second memory means each time a radio telephone call occurswherein unauthorized use of said at least one mobile radio telephone unit is indicated by said comparisonsignal when said second numeric data (LNC) stored in said network communication means is not the same as said first numeric data (LNC) received from said at least one mobile radio telephone unit when a radio telephone call occurs.

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