Android: Today, Google released an Android version of the Android Device Manager to the Play Store. Previously you could only locate your devices from the web, but now your phone can find your tablet, and vice versa.
The Android app has all the same features of the desktop version. You can find where your devices are, make them ring out loud even if they've been silenced, and add a new password lock screen remotely.
Android Device Manager | Google Play Store via Android Police