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That would significantly increase its value: a button on the unit to cause the phone to buzz, so that one can always be used to find the other.

Can't you just call your phone? If you can't find another phone from which you can make a call, you can always use Google voice from inside gmail or use http://www.wheresmycellphone.com/

Use Apple's "Find iPhone" app from your computer or a friend's phone

Tim: that's our #1 FAQ entry! You can definitely use Hone for anything, we just wanted to focus on keys because it's the clearest use case.