iPhone Find My iPhone can help you locate and secure your iPhone using the free Find My iPhone app (available in the App Store) on another iPhone, iPad, or iPod touch, or using a Mac or PC web browser signed in to www.icloud.com/find. Find My iPhone includes Activation Lock, which makes it more difficult for anyone else to use or sell your iPhone if you ever lose it. Your Apple ID and password are required in order to turn off Find My iPhone or to erase and reactivate your iPhone.
Turn on Find My iPhone. Go to Settings > iCloud > Find My iPhone.
Important: To use Find My iPhone features, Find My iPhone must be turned on before your iPhone is lost. iPhone must be able to connect to the Internet for you to locate and secure the device.
Use Find My iPhone. Open the Find My iPhone app on an iOS device, or go to www.icloud.com/find on your computer. Sign in and select your device.
Play Sound: Play a sound for two minutes.
Lost Mode: You can immediately lock your missing iPhone with a passcode and send it a message displaying a contact number. iPhone also tracks and reports its location, so you can see where it’s been when you check the Find My iPhone app.
Erase iPhone: Protects your privacy by erasing all the information and media on your iPhone and restoring iPhone to its original factory settings.
Note: Before selling or giving away your iPhone, you should erase it completely to remove all of your personal data and turn off Find My iPhone Activation Lock. Go to Settings > General > Reset > Erase All Content and Settings. See Sell or give away iPhone?.