Google Voice is very seamlessly integrated into the Google Talk program and the Gmail service. It’s extremely easy to make calls and deal with all of your phoning needs while you are logged into your Gmail account. You can add credits using Google Play, you can manage your contacts, you can read your voicemail, you can record your voice and transcribe it to text for sending by email and a host of other features, such as SMS to email, conference calls and some of the best VoIP/SIP rates in the world. In fact, if you are located in the United States then the rates are completely free for all of North America.
IDC projected over 9 billion minutes of voice traffic to travel over worldwide packet networks in 2000, exceeding 135 billion minutes in 2004. Service revenue is projected at 1.6 billion in 2000 and 18.7 billion in 2004.