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Android's Find My Device network will get a huge upgrade soon – here's how it'll work
(www.techradar.com)
this post was submitted on 27 Aug 2023
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Find My Device is completely useless until the device is unlocked. As long as it is rebooted and not unlocked, there is no way to detect its location. Since most phones (if not all), use an encrypted filesystem. With such, no service can't start if the device isn't initially unlocked after reboot, including Find my device.
This isn't only a issue with Google's implementation, it's the same with other implementations to.
That's not how that works. There's special access to some apps that get unencrypted right at boot. That's how your phone can reboot in middle of the night and your alarm will still go off despite you doing the initial unlock. Find my device also has that ability.
See the "ACTION_LOCKED_BOOT_COMPLETED" permission for how it works.