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I don’t think there is a way to locate it down to the level of what room it is in using GPS unless you have a really, really large house. Or live in a mall. Even if the ringer is off, I am pretty sure that you can use the Android Dashboard that you can access through your google account. There will be an option to “Ring” (as well as “Lock” and “Erase”), click “Ring” and it should, wait for it...ring. Good luck!