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Find My Device: What it is and how to use it to find your Android phone
Find My Device is an invaluable tool to locate your phone, and it's about to get much better.
Find My Device easily lets you remotely track, lock, and erase the data on a lost or stolen phone. (Image credit: Harish Jonnalagadda / Android Central)You'll need to sign in to Find My Device from your Google account. In addition, you can display a message over the lock screen and add a button to call back your number so that anyone that comes across your phone can easily get in touch with you.
Or read this on Android Central