Call or text the phone from another device
Use Find My Device on Android
Use Find My on iPhone
Check recent locations in your Google or Apple account
Ring the phone if it is nearby
Look in common places you used it last
Ask someone nearby to call it
Check Bluetooth device connections for a nearby signal
Review location history if enabled
Contact your carrier to report it lost
Lock the phone remotely
Erase the phone remotely if needed
File a police report if it was stolen