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Mobile telephone with function to prevent illegal use and method and system for preventing illegal use of mobile telephone using the function

  • US 5,734,978 A
  • Filed: 12/15/1995
  • Issued: 03/31/1998
  • Est. Priority Date: 12/28/1994
  • Status: Expired due to Fees
First Claim
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1. A method of preventing illegal use of a mobile telephone, comprising the steps of:

  • repeatedly originating a call to said mobile telephone over a wireless path;

    when the call is received by said mobile telephone over the wireless path so that a communication channel is established, transmitting a destruction code including a cryptographic data to said mobile telephone;

    said mobile telephone receiving the destruction code and comparing the cryptographic data of the received destruction code with a preset data stored in said mobile telephone to determine whether both the data are matched; and

    said mobile telephone destroying a telephone functioning information stored in said mobile telephone when it is determined that both the data are matched, said telephone functioning information being information necessary for performing communication.

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