Google Voice, New Free Call Features with GMAIL

With integration of Google Voice and Gmail , which essentially allows users to place voice calls via Gmail to phones anywhere in the world. Calls to both landlines and mobile phones within the U.S. are free; 

Google charges a small fee to dial numbers in other parts of the world, depending on the region and whether it's a landline or a cell phone. 

users with Google Voice can take advantage of Google voice features within the Gmail context, such as the ability to record phone calls, listen to users leaving a voice mail and then join a call, or have incoming calls "ring" both a separate phone as well as the browser.  

Read How to Make Call Free From Google Voice : Here