Google Voice, which Google officially announced last week, lets you create a single phone number from which to manage all of your cell phone numbers, phone numbers, voice mail, text messages, and more. As you may recall, Google Voice was originally called GrandCentral, which was bought by Google last year. Google Voice retains a lot of GrandCentral's original services, but they also add some cool features. If you've been a GrandCentral customer before, you can now experience Google Voice directly.