Schneier — “The UK company Cobham sells a system that…”

Source: Data and Goliath: The Hidden Battles to Collect Your Data and Control Your World — Bruce Schneier

Book page: schneier-data-and-goliath-part-1

From: Bruce Schneier — Quotes

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The UK company Cobham sells a system that allows someone to send a “blind” call to a phone—one that doesn’t ring, and isn’t detectable. The blind call forces the phone to transmit on a certain frequency, allowing the sender to track that phone to within one meter.