Yes right now, you can use your GMail account from GMail web interface to make International Call. For example you can make a call from California USA to your friend that live in Paris, France. Of course just like others Internet to Phone Communication, it used VoiP Service
Billing that you have to Pay in GMail
If you used only GMail to GMail Voice, you can used GMail Video Chat that run and works for you as free. But if you used Phone Call you have to pay some money to do that. For list of the Charging Bill of GMail Phone Call you can find it at here.
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