Google has recently added a function to Gmail to allow a user to make calls to "normal" telephones right from Gmail. All you have to do is click the phone button in the chat window, select your country, enter the telephone number and click "Call". This allows you to call internationally at very reduced rates and apparently it's free to the United States. It seems that each user has a token $0.10 credit by default to give it a try. so... why not? I've tried to call my cellphone and... well, it works!