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Method and apparatus for control of a subscriber identity module in a data communication system

  • US 6,934,391 B1
  • Filed: 11/24/1999
  • Issued: 08/23/2005
  • Est. Priority Date: 06/04/1997
  • Status: Expired due to Fees
First Claim
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1. A method, for use in a mobile data communication system that includes:

  • first and second subscriber registers (HLR1, HLR2) for maintaining subscriber records;

    a message transmission system (SMSC) for transmitting messages in the communication system; and

    a mobile station (MS) for use by a subscriber in effecting mobile communications through said mobile data communication system said method being for controlling a subscriber identity module (SIM) attached to said mobile station (MS), in which subscriber identity module (SIM) is stored subscription data comprising a first subscriber identity code (IMSI1) and an encryption code key (Ki) corresponding to a first subscription for the mobile station subscriber such that when said first subscription is opened for said mobile station subscriber, a record of data corresponding to said first subscription, with said record comprising;

    a first subscription-specific call number (MSISDNx), said encryption code key (Ki), and said first subscriber identity code (IMSI1) for said mobile station subscriber, is created in said first subscriber register (HLR1);

    said method comprising the steps of;

    a.) opening a second subscription for said mobile station subscriber;

    b.) creating in said second subscriber register (HLF2) a record of data corresponding to said opened second subscription, and comprising;

    a second subscription-specific call number (MSISDN), said encryption code key (Ki), and a second subscriber identity code (IMSI2) for said mobile station subscriber;

    c.) transmitting through said mobile data communication system to the mobile station (MS) a message (SMS) addressed to said first subscription-specific call number (MSISDNx), said message instructing to change said first subscriber identity code (IMSI1) comprised in said subscription data stored in said subscriber identity module (SIM) into said second subscriber identity code (IMSI2); and

    d.) changing, at said subscriber identity module (SIM) attached to said mobile station (MS) and in response to receipt of said message (SMS), said first subscriber identity code (IMSI1) into said second subscriber identity code (IMSI2).

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