There are official Google Voice mobile apps available for iOS, Blackberry and of course for Google's own Android OS. But what about Windows Phone? News.com reports that according to an official statement from Google, it states:
We're focusing our Google Voice efforts on Android & iOS and don't have a plan to extend this to the Windows Phone. This may change if we start to see greater demand from Windows Phone users for Google Voice.
So far, Google has only released one official app, Google Search, for Windows Phone users. It has yet to add any Windows Phone apps for its other popular services such as Google+ or Blogger. There are some unofficial Google Voice apps available to download from the Windows Phone Marketplace, but as the News.com article points out, there are big security concerns with using such third party apps.
On Friday, Google announced that it was shutting down a number of its projects. One of them was the mobile web app for another related Internet-based phone service, Google Talk. In the blog, Google states; "For mobile users who want to continue using Google Talk, we recommend using the native Google Talk app on Android or any XMPP-compliant apps on other mobile platforms."