This has nothing to do with genealogy, but I am a big fan of Google's free telephone service and have written about it several times. See http://goo.gl/Qxg0K for a list of my past articles about Google Voice. Now Google has announced that the service will continue to be free through all of 2013. The official, although brief, announcement is available on the Official Gmail Blog at http://gmailblog.blogspot.com/2012/12/free-calling-within-us-and-canada.html.
GoogleVoice is available to all U.S. residents. It provides FREE telephone calls to any telephones in the United States and Canada and calls to other countries are available at very, very low prices, much lower than what most telephone companies charge. Google Voice does NOT replace your present telephone. You keep your present phone or else replace it with a lower-cost service obtained elsewhere. Google Voice simply adds extra functionality to your present phone, regardless if it is a standard, old-fashioned phone, a cell phone, or a VoIP (Voice over Internet Protocol) computer phone. There is no need to use a headset on your computer or anything similar. You also (optionally) can use a new telephone number for use on incoming calls, again at no charge.