If you want a good security app for your phone, then Android Device Manager -- which has been renamed Find My Device -- is a good choice.
As the name suggests, the main function of Find My Device is to help you locate your Android phone if you misplace it. You link the app to your Google account, so it can help you locate any device that's linked to the account.
Find My Device also performs other security functions, including allowing you to remotely delete date from a lost device and reset your screen lock password.
The app is free to download and easy to use, and because it links to your Google account, it gives you convenient access to all your devices under one account.
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