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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Subscriber Identity Module
   SIM
      <telecommunications, wireless> (SIM or "SIM card") A component,
      usually in the form of a miniature smart-card, that is
      theoretically tamper-proof and is used to associate a mobile
    subscriber with a mobile network subscription.  The SIM holds
      the subscriber's unique MSISDN along with secret information
      such as a private encryption key and encryption and digital
      signature algorithms.  Most SIMs also contain non-volatile
    storage for network and device management, contact lists, text
      messages sent and received, logos and in some cases even small
      Java programs.
      (2007-01-06)