How silent signals from your phone could be recording and tracking you

Advertisers may track a customer’s shopping preferences within a shopping centre by using ultrasonic beacons emitted from their mobile phones. Mai Lam/The Conversation NY-BD-CC, CC BY-SA Richard Matthews, University of Adelaide My lounge room is bugged. My phone is broadcasting an ultrasonic signal to my blu-ray player via an acoustic side channel beyond human hearing. The […]

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