How are iPhones still findable even when turned off

Apple revealed iOS 15 back in June, during its opening WWDC21 keynote. While the update wasn’t as packed as we had hoped it would be, it still brought some significant improvements to the table. One of these additions is Find My support, even when iPhone is turned off. However, it is only available on select models. So why isn’t this feature supported on all iPhones running iOS 15, and how does it exactly work?

According to a post by Naehrdine:
All the iPhone needs to have Find My enabled while it is “off” is some basic power control as well as a Bluetooth chip that can send Bluetooth LE advertisements. Moreover, these advertisements require secret key material bound to the Apple ID on the iPhone.

So when a supported iPhone is powered off, Find My runs in the Bluetooth chipset via a custom applet. The rest of the device is completely off, so only this chip is awake and running on low power to transmit BTLE beacons. While the article mentions AOP (always-on processor), Hector Marti…

Written By: Mahmoud Itani

Original Article: https://www.xda-developers.com/iphone-findable-turned-off/

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