A Digital Cellular Telephony System
GSM Info - Overview of the GSM System (very basic & high level), including European coverage maps
GSM encryption - analyzed by the CypherPunks
GSM Security and Encryption - An Overview, by David Margrave
apparently is not - A5 Key analysis and conclusion by CypherPunks
GSM_Hack - software apparently for users of Ericsson's GSM switch
SMS Information - Information on how to receive and send GSM SMS information
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