My wife and I both have cell phones. We no longer use a home phone since we're on the go all the time. Why pay for a landline you hardly use.
Step 1: Materials and Explanation:
I "misplace" my phone "occasionally", and my normal method to find it is to call my phone with my wife's. There are times, however, when she isn't home, and I can't find my phone.
Here is my solution:
You will need a PC with an internet connection.