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Strategies & Market Trends : Gorilla and King Portfolio Candidates

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To: Ausdauer who wrote (27213)	7/3/2000 11:22:10 AM
From: John Walliker	Read Replies (2) of 54805

Ausdauer, The subscriber identity module (SIM) card used in GSM phones is defined in the GSM specification (which can be downloaded from the ETSI web site). At a minimum it has non-volatile memory for account details, network information, user phone numbers and a microcontroller running encryption algorithms. Some of the memory locations are one-time programmable for security reasons. If a preset number of attempts at guessing the security code is exceeded the SIM is locked and can be reset only by the network operator (remotely). If another, higher number of attempts is exceeded the SIM self-destructs. A neat aspect of SIMs is that a perfectly ordinary Vodafone (and probably other networks) SIMs can be placed in a GSM Globalstar phone and used immediately without needing to open a special G* account. This works because from a GSM perspective, G* is just another country. John

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