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 deviceNote: If you put your iPhone 6 or iPhone 6 Plus in Lost Mode and you have credit and debit cards in Passbook for Apple Pay, Find My iPhone attempts to suspend your cards immediately, even if your iPhone is offline.
Remotely erase all of your personal information from the deviceNote: If you erase your iPhone 6 or iPhone 6 Plus and you have credit and debit cards in Passbook for Apple Pay, Find My iPhone attempts to remove your cards immediately, even if your iPhone is offline.
If you’re a member of a Family Sharing group, you can also use Find My iPhone to help find and protect your family members’ iOS 8 devices and Mac computers with OS X Yosemite. Family devices and computers must be set up to share their locations with other family members. For more information, see Set up Find My iPhone.
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.