Hundreds of Apps Using Ultrasonic Signals to Silently Track Smartphone Users


Your smartphone may have some apps that are continuously listening inaudible, high-frequency ultrasonic sounds from your surroundings and they know where you go, what you like and dislike — all without your knowledge.

Ultrasonic Cross-Device Tracking is a new technology that some marketers and advertising companies are currently using to track users across multiple devices and have access to


Source: TheHackersNews Hundreds of Apps Using Ultrasonic Signals to Silently Track Smartphone Users