Hundreds of Apps Using Ultrasonic Signals to Silently Track Smartphone Users

By noreply@blogger.com (Mohit Kumar) 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

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