iCloud: Find My iPhone overview
Locate your device on a map
Play a sound on your device to help you find it
Use Lost Mode to lock and track your device
Remotely erase all of your personal information from the device
If you have Family Sharing set up and your family members have Show My Devices to Family turned on (in Settings > iCloud > Family > Me), you can also use Find My iPhone to help find and protect your family members’ devices. For more information, see the Apple Support article Guide to Family Sharing.
When you set up Find My iPhone, Activation Lock is turned on automatically. Activation Lock makes it harder for anyone to use or sell your iPhone, iPad, or iPod touch if it’s ever lost or stolen. For more information, see the Apple Support article Find My iPhone Activation Lock in iOS 7.
Access Find My iPhone from any computer at icloud.com/#find, or download and use the free Find My iPhone iOS app. If you’re having trouble with Find My iPhone, see the Apple Support article Troubleshooting Find My iPhone.