From your Gmail account, users can make calls to home and mobile phone for free until the end of this year for the U.S. and Canada, and the super-low fare to the phone to another country.
For example, if a user wants to call to England, Germany, China, France, and Japan, it cost only 2 cents U.S. per minute.
First you must have Google email account , here Step by Step how to make Gmail.
Step #1 : Login to Gmail
type url : www.gmail.com
user name: your user name
and password: your password
then click Sign In
Step #2 : Right site Menu Click Chat
Step #3 : Click Accept And Install to install plugin
Step #4 : Click Install Voice and Video Chat to download
Step #5 : Click GoogleVoiceAndVideoSetup.exe, after install, restart browser.,
Step #6 : Login to your gmail account
and ready to free call