Open the Find My app on another Apple device
Sign in with your Apple ID if needed
Tap Devices
Select your iPhone from the list
View its location on the map
Tap Play Sound to help locate it nearby
Tap Directions to navigate to it
Turn on Notify When Found if the phone is offline
Use Mark As Lost to lock it and display a message
Go to iCloud.com/find in a web browser if you do not have another Apple device
Sign in with your Apple ID
Select your iPhone
Check whether Location Services and Find My iPhone were enabled before it was lost
Contact your carrier if you need to suspend service
Report the device to local authorities if it was stolen