Use the Find My app on your own Apple device
Sign in with the Apple ID that has permission to locate the iPhone
Open the Devices tab
Select the iPhone from the list
View its location on the map
Play a sound to help find it nearby
Use Directions to get to the phone
Enable Notify When Found if the iPhone is offline
Check iCloud.com/find in a web browser
Ask the owner to share their location with you through Find My
Contact the carrier or local authorities if the phone is lost or stolen