Originally Posted by jarablue
So does it or does it not use your minutes?
Google Voice by itself will use your minutes.
Some people around it if they already have VOIP service. Also, if you have free calling to / from a number (like some sort of friends & family plan), you can add your GV number to your list of free number. Then, you will have to get a special dialer to act as a calling card to dial your GV number.
This document goes into it in great detail:
Unlimited Free Calling with Google Voice - Google Docs