this post was submitted on 02 Jan 2025
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[–] culpritus@hexbear.net 25 points 2 months ago* (last edited 2 months ago)

If just one person's phone is listening, it can communicate to other devices using ultrasonic signals about what keywords were heard. This is why a lot of apps request mic/speaker access when they have no real reason to do so.

https://www.wired.com/story/ultrasonic-signals-wild-west-of-wireless-tech/