Use Find My on another Apple device or at iCloud.com/find
Sign in with the Apple ID linked to the iPhone
Check the last known location shown on the map
Enable Notify When Found if available
Mark the iPhone as Lost in Find My
Keep checking Find My for updated location if it comes back online
Check Family Sharing if the iPhone is in a shared Apple account
Review Google Maps Timeline if location history was enabled
Contact your carrier to suspend service and ask about device tracking options
File a police report with the serial number and IMEI
Report the device as lost or stolen to Apple Support
Use the serial number or IMEI to ask local pawn shops or resale stores to watch for it
If the battery is dead and Find My was not enabled, use the last known location only
If it was stolen, change your Apple ID password and review account security