Turn on Android Device Manager
Open Google Settings from your device’s apps menu.
Touch Android Device Manager.
You can turn on the following options:
Remotely locate this device. Find your device and show its approximate location on Google Maps. For devices running 4.1 and higher, location access must also be enabled.
To turn it on, go to Google Settings > Location > Access location.
Allow remote lock and factory reset. Lock your device and erase everything on it. You can also change the lock screen passcode. Touch this option, then select Activate to turn on the device administrator.
If more than one person uses a tablet, only the tablet owner can turn on Android Device Manager.
Find Your Device
Sign in to your Google Account on android.com/devicemanager. If you're using a Google Apps account, you will sign in to your My Devices page.
You'll get a notification on each of the mobile devices that are linked to your Google Account. The notification asks you to turn on Android Device Manager.
If you have more than one device, select the arrow next to the device name to change the one displayed. To rename the device, use the Edit icon.
Locate a friend's device
If a friend loses their device, they can sign in to Android Device Manager on Chrome using your mobile device. They should follow the instructions below instead of adding their account to your device.
Open Chrome, and create an incognito tab.
Have your friend sign in to the Google Account that they use on their mobile device.
After locating the device, have your friend follow the steps below to remotely lock or erase the phone or tablet.
When your friend is finished, close the Chrome tab.