With iOS 15, your iPhone is still traceable through Find My Network, even when the device is turned off. It seems like the phone with iOS 15 is not really ‘turned off’, it stays in low power mode and acts as an AirTag, so any iOS device nearby can pick up the Bluetooth signal and send back the location.
This also means that if the iPhone runs out of battery during the day, you still have the chance to find its location for several more hours. In fact, Apple says that position tracking will even continue to work while the phone is reset to factory settings with the activation lock enabled.
Apple informs users about this new behavior with an alert dialog when the recently updated iOS 1
Interestingly, the copy of the alert dialog refers to this feature for recovering stolen items. In general, Apple does not recommend using the Find My features to combat theft.
If you want iPhone to actually shut down, you can change the behavior in Settings and disable Find My Mode with low power.
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