A powered-off phone can't report its live location, but you are not out of options: Google stores the last known location, and newer Androids can be findable even offline.
- 1Open android.com/find and check the last known location, often enough to know if the phone is at home, work or a store.
- 2In Google Maps → your profile → Location sharing / Timeline, check the device's location history.
- 3On Android 9+ with the new Find Hub network, nearby Android devices can relay an offline phone's position, check the map again periodically.
- 4Lock the device remotely so it is protected the moment it powers on.
- 5Report the IMEI to your carrier and the police if you believe it was stolen.
Tip: Enable 'Store recent location' and offline finding in Settings → Google → Find My Device today, it only helps if turned on before the phone is lost.