Goole now offers calling free to US & Canada directly-in addition to Google Voice-Call right from your browser

[Ken Sp.]

bazookaman wrote:
can you do that on your cell phone so you just use your unlimited data plan vs minutes?

Not yet--it requires a plug in for the browser, but I bet it is coming.

You can use http://www.whistlephone.com/ on the Mac or iPhone/iPad.Touch but you have to listen to a short ad.