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New research: your phone can do ultrasound sonar tracking against you
https://www.privateinternetaccess.com/blog/2017/09/your-phone-can-now-be-turned-into-an-ultrasound-sonar-against-you-and-others/
Saturday 16 September 2017 -New research shows that your phone and TV can be subverted into indoor tracking devices for your motion, using inaudible ultrasound sonar.
