
Researchers discovered 234 Android apps that could be spying on users CREDIT: GOOGLE
Hundreds of Android apps could be covertly tracking users via inaudible sounds emitted by nearby devices, researchers have found.
Researchers discovered technology that lets devices talk to one another for tracking purposes using ultrasonic tones on 234 Android apps.
Televisions, billboards, websites and shops can emit the high frequency sounds, which can't be heard by humans but are picked up by the apps. This signals whether a person has engaged with an advert by watching it, or visited a shop, and how long for.
Apps featuring the technology include those from McDonald's and Krispy Kreme....