The Google Voice service is more of a “phone number management” service than a typical Internet phone service so it does a lot more than let you make free phone calls. Still, if all you want to do is to make free phone calls, Google Voice is your best bet.Google Voice was formally known as GrandCentral.
Types of Free Calls With Google Voice:
Google Voice can be used to make free PC to phone calls and free PC to PC calls.
The easiest and most common way to use Google Voice, however, is to allow the service to connect your phone to the destination number for free. I suppose you could call this a free “phone to phone” call.
Sign Up for Google Voice:
You can sign up for Google Voice for free here using your Google Account, the same information you use to access other Google services.
How To Use Google Voice:
To use Google Voice to make free phone calls, log in to Google Voice and click the Call button. Enter a US or Canadian number in Number to call, choose a Phone to call with (this is your home or mobile number you told Google about when you signed up), and then click Connect. Google will dial the number you entered and connect the call to you for free.
To use Google Voice to make free PC to phone calls, install the free Google Voice and Video Chat Plugin, also called the Hangout Plugin. Once installed, you can make free calls from the Chat or Hangouts area in Gmail to real phones using just your PC microphone and speakers.
PC to PC calls, usually called voice chat or video chat, can be made using Google+ Hangouts.