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Android 15 will run Bluetooth with your phone still turned off.
(security.googleblog.com)
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[Matrix/Element]Dead
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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.