Android Device Manager is Google's rather handy package of web and mobile software that allows you to remotely locate, ring, or lock your phone or tablet. Of course, it's not especially useful if it can't actually interact with your device. Most of the time errors are because a phone can't be reached via data, or because permission has been reset in the ADM app itself. But a small group of users are having trouble with getting ADM to recognize their devices at all.

In a detailed post on Google's Nexus Help Forum, Nexus 5 owner Sandra Buensalida recounted her frustration when the Android Device Manager wouldn't recognize her phone after trying it out on several different network and hardware configurations, and applying every possible troubleshooting solution she could find.
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