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Android 15 will run Bluetooth with your phone still turned off.
(security.googleblog.com)
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this post was submitted on 12 Apr 2024
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Privacy
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That doesn't say that. Although the article linked from there does, for Pixels.
even with a dead battery? how? there must be something 'turned on' to send bluetooth signals or is this magic?
I suspect it still draws battery power, but extremely small amounts. Few mah left in the battery could power a BLE beacon for weeks. There would be some limit to this as draining the lithium battery too deeply will damage it.
Not necessarily, there are lots of completely passive beacon technologies. I seem to remember reading a few years ago about beacons powered by Wifi signals.
Obviously you also need other phones to be able to pick up those signals so it might take until phones with Android 15 become commonplace which might take a while. But it's definitely doable.