Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1993-07-01
1995-08-22
Kuntz, Curtis
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
379357, H04M 1100
Patent
active
054447640
ABSTRACT:
A radiotelephone system (100) includes a radiotelephone (103) having a subscription lock and a removable subscriber identification module (SIM) card (105) containing an international mobile subscriber identification (IMSI). The subscriber lock is used to restrict registration into the radiotelephone system (100) to only those radiotelephones which contain a SIM card which has an IMSI which falls within a range of valid IMSIs programmed into the radiotelephone or the user has entered a subsidy flag personal identification number (PIN) for permanently disabling the need for a valid IMSI.
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patent: 5237612 (1993-08-01), Raith
patent: 5257414 (1993-10-01), Trahan et al.
patent: 5266782 (1993-11-01), Alanara
Rahnema, M., "Overview of the GSM System and Protocol Architecture" IEEE Communications Magazine, vol.: 31 Iss: 4 pp. 92-100 Apr., 1993.
Vedder, K., "Smart Cards" CompEuro 1992 Proceedings Computer Systems and Software Engineering (Cat No. 91CH3121-1) pp. 630-635 1992 (Conf. Date May 4-8, 1992).
Chernoff Michael B.
Dailey Kirk W.
Kuntz Curtis
Motorola Inc.
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