This is cool.

J and I no longer have a house phone. Really only telemarketers (and my mom) ever called it, and we decided we didn't need to spend money on it. The one thing that irks me about not having a home line is that it does one incredible useful thing: you can call your missing cell phone on it.

Now I've only had an incredibly lost phone once since moving, but it was a pain. But no longer, my friends!

http://www.icantfindmyphone.com/

I did try it, and it works!