• culpritus [any]
    ·
    edit-2
    4 days 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/