Google announced a new application called Google Voice that helps you better manage your voice communications. Google Voice is a service that gives you one number for all your phones, voicemail that is easy as email, and many enhanced calling features like call blocking and screening, voicemail transcripts, call conferencing, international calls, and more. Google Voice will be available initially to existing users of GrandCentral.
The new application improves the way you use your phone. You can get transcripts of your voicemail and archive and search all of the SMS text messages you send and receive. You can also use the service to make low-priced international calls and easily access Goog-411 directory assistance.
Google Voice gives you one number for all your phones - a phone number that is tied to you, not to a device or a location. Use Google Voice to simplify the way you use phones, make using voicemail as easy as email, customize your callers' experience, and more.
Google Voice isn't a phone service, but it lets you manage all of your phones. Google Voice works with mobile phones, desk phones, work phones, and VoIP lines. There's nothing to download, upload, or install, and you don't have to make or take calls using a computer.
Google Voice will let you define which phones ring, based on who's calling, and even let you ListenIn on voicemail before answering the call. It uses smart technology to route your calls. So, if you're already on a Google Voice call, it'll recognize that and use call waiting to reach you on the phone you're on.
See the below video for more details :
Check out the features page for videos and more information on how these features work.