One app that makes Google Voice much more useful is GrooveIP (<a href="https://play.google.com/store/apps/details?id=com.gvoip&hl=en" rel="nofollow">https://play.google.com/store/apps/details?id=com.gvoip&...</a>). It routes calls over VoIP instead of using your phone's minutes. It also makes using a tablet to make calls feasible.