Major telecommunications companies may be in for some serious competition now that Google Inc. has decided to press into the telephone market, offering Gmail users as well as standalone users of Google Voice to make international (Canada / U.S.), long distance, and local phone calls for free via computer.How to Make Free Phone Calls Through GmailGoogle Voice is conveniently installed into the Gmail chat interface for users who prefer to have all of their communications solutions in one single place. The service is currently available for users in the United States and Canada.To make a free phone call with Google Voice from within Gmail, simply log into your Gmail account. Observe the chat panel which loads on the left hand side of the internet browser window. Just above the names of your o