How Your Dead iPhone Secretly Stays Alive to Guide You Home

Losing an iPhone with a dead battery used to be a one-way ticket to despair, but Apple’s clever engineering changed the game. Thanks to a feature called Power Reserve, your dead iPhone isn't actually completely dead. It saves a tiny, secret reserve of battery power to keep essential chips running. For up to twenty-four hours after shutting down, your iPhone essentially mimics an AirTag. It uses Bluetooth Low Energy and the Ultra Wideband chip to broadcast silent, encrypted signals. Any nearby Apple device belonging to a stranger silently picks up this signal and securely relays your phone's location back to the Find My network. It is a brilliant, invisible rescue squad working behind the scenes to make sure your lost device can always find its way back home.