How To Use Find My iPhone
1. If your phone happens to go missing, you can sign in to iCloud.com/find on either a Mac or PC, or on the Find My iPhone app on another Apple device.
2. Once signed-in, select the missing phone to view its current location on a map. If it happens to be nearby, you can have it play a sound to help you find it. If the phone happens to be far away, you can turn on Lost Mode.
3. Lost Mode will ask you to enter a phone number that will display on the lost device’s screen, this will allow a person to call that number if they happen to find the device.
4. If you feel that you won’t be able to find the phone, you can remotely delete all your personal information. However, once you erase your information you’ll no longer be able to track it.