GoKawiilApple's Find My network lets iPhone tracking work even after power off
Apple's Find My network is a separate, crowdsourced Bluetooth feature from the standard Find My app, and it must be manually enabled to locate an iPhone that is offline, in Power Reserve mode, or powered down. Users can verify and adjust these settings under Settings > [Name] > Find My, and should also enable Send Last Location, Location Services, and Bluetooth to ensure tracking works. Disabling Control Center access from the lock screen can also stop thieves from quickly enabling airplane mode to cut a stolen phone off from the network.