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Digital radiotelephone installation with mobile terminals

  • US 5,875,404 A
  • Filed: 04/24/1996
  • Issued: 02/23/1999
  • Est. Priority Date: 10/26/1993
  • Status: Expired due to Term
First Claim
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1. Digital radiotelephone installation with mobile terminals, said installation including a network with at least one fixed base station transceiver, and mobile terminals at least some of which are designed to be unable to access the network until a user has inserted therein an extractable personalized SIM card,said mobile terminals being each designed to receive, in addition to said extractable SIM card, an auxiliary SIM card which remains in said mobile terminal at all times,said auxiliary SIM card corresponding to the same personalized subscription as said extractable SIM card,said extractable SIM card taking precedence over said auxiliary SIM cards when said extractable SIM card is inserted into said mobile terminal, and having the same functionality as said auxiliary SIM card,wherein said auxiliary SIM card is assigned by said network, or by said terminal, only specific predefined services, such as an answering function, a short messages service function, or an outgoing call restriction.

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