Lifehacker points out that you can make absolutely “free” phone calls to U.S./Canada businesses by using Skype and GOOG-411.
Skype calls toll-free numbers in the U.S. or Canada for free. Google’s GOOG-411 directory service is a toll-free number, and can connect you to any searchable business. Combine the two, and any business is accessible for free, from anywhere in the world.
This could be a great way to make those calls finally to the U.S. when you are out of the country without wasting precious international minutes.