How silent signals from your phone could be recording and tracking you
- Written by Richard Matthews, PhD Candidate, University of Adelaide
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-SAMy 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 channel...