Google has indicated it has no plans to release a version of its Google Voice app for Windows Phone, although it may change its mind if there is "greater demand from Windows Phone users"



From Neowin:

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.

  Google: No plans for Google Voice for Windows Phone