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Use Find My iPhone on your iPhone, iPad or iPod touch
Find My Friends and Find My iPhone have been combined into a single app — Find My 
— available on iOS 13, iPadOS 13 or later. Find My helps you locate your friends and Apple devices using information stored in iCloud.
If your iPhone, iPad or iPod touch has iOS 12 or earlier, use Find My iPhone 
to see the location of your Apple devices and protect them if they ever get lost or stolen. Find the software version of your device.
First, set up Find My iPhone by adding your Apple devices. Then learn what you can do in the app on your iPhone, iPad or iPod touch.
What can you do with Find My iPhone on iOS 12 or earlier?
Locate a device: see the location of your iPhone, iPad, iPod touch, Mac, Apple Watch or AirPods on a map. Play a sound on a device to help you find it.
Mark a device as lost: if you lose a device, you can use your iPhone, iPad or iPod touch to mark it as lost and help protect your personal information. Display a custom message on the lost device’s screen, telling people that the device is lost or how to find you. Once you find the device, you can turn off Lost Mode.
Erase a device: remotely erase all your personal information on a device from your iPhone, iPad or iPod touch. Activation Lock remains on to protect the device.
Remove a device from your account: if you are no longer using a device, or you have sold it or given it away, remove it from your account so it does not appear in Find My iPhone.
Learn how. You can open Find My iPhone Help on your iPhone, iPad or iPod touch. Open the Find My iPhone app, sign in with your Apple ID, then tap Help in the top left-hand corner.
You can also use Find My iPhone in a web browser on an iPhone or iPad. See Use Find My iPhone on iCloud.com on your iPhone or Use Find My iPhone on iCloud.com on your iPad.