Help friends find their Android device with the Android Device Manager
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If you haven't started using the Android Device Manager for your phones, we recommend that you do. But did you know that there's a guest mode you can use to help out other people? Just like how you would use the app. You can let a friend log in through guest mode to help them locate, lock, or wipe their device.
Source: Lifehacker | Download: Google Play Store (Free)