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Loaded comments page to post this same thing. For some extra info, based on my understanding of the mechanism:

- Lost devices regularly emit Bluetooth chirps with encrypted payloads

- If any iOS 13 devices hears them, it relays them to iCloud (these devices cannot decrypt them)

- My guess is that the relaying device contributes its own GPS metadata. One of the design goals of Find My is that very low-battery devices can still emit location, so it makes sense they wouldn't spin up their own GPS receivers

I regularly bike around with non-Apple Bluetooth headphones. Anecdotally, I started getting some connection breakups at iOS 13 launch that I had never experienced. I'm pretty sure this is my phone briefly giving the Bluetooth radio more time to receive these chirps, and I'm biking by one.

(I was running the iOS beta since about mid-cycle, and didn't start getting these connection glitches until after public launch)

My home automation scans BTLE to augment my presence information, and these brief interruptions sound a lot like the slight interruption I get when I bike into range of my house.



This feature requires at least 2 iCloud devices to work per this [0] article. In developing countries people only (mosty) got iPhone as their iCloud ecosystem.

[0]https://www.wired.com/story/apple-find-my-cryptography-bluet...


> If any iOS 13 devices hears them

Even devices turned off.




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