Useful information from John Tangent:
If the link failed goto https://accounts.google.com and look for the Device Manager. You can make it ring no matter the setting, lock and even erase it.
And from Kirin Wagle:
iOS devices do include a standard feature that emits a beeping sound when you go to Find My iPhone and clap the "play a sound" button. They also report their last known position when the battery dies.
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