Google Voice is now available via BlackBerry and Google Android smartphones.

Google began sending invitations to join Google Voice last month, and today said an application for the two smartphone platforms is available.

Before today, BlackBerry and Android device users had to dial a Google Voice number from their phone, or online, to place a call.

The new apps allow users to make calls and send SMS with a Google Voice number directly from their Android or BlackBerry smartphone. The call can be made directly from the phone's address book because the app is integrated with the phone, Google said.

The application means a user can access voicemail, read SMS messages sent to Google Voice and access call history. Users can also place calls and send SMS messages. A video at Google's blog explains some of the functions.

The app is available to Android phone users at the Android Market, but BlackBerry users must download it from m.google.com/voice. Google Voice is by invitation only still, but Google said it is sending out invitations daily to those who have registered.

Google didn't indicate when Google Voice might be available for other platforms such as the iPhone, Windows Mobile devices or Palm's WebOS. Some reports have indicated that Google is working on an iPhone version.

See also:

Google Voice review

Why in the end you'll pay for Google Voice