Actually couple of days ago I did install GrooveIP and have been using Google voice on both Gtab and my android phone. In my case, being in Brazil, I am now able to call US at no charge as a local call. However because my tablet is not rooted I am unable to call the contacts from within the contact list (using GVoice) and I have tried many different contact and dialer applications in addition to the stock. I simply use a headphone when I want privacy. Having only ONE Google number it forwards to all my phones numbers wherever I might be in the world, being Tmobile USA, Oi Brazil or Land Line at no cost to either party. Having said that, considering that my phone has Google Voice , I do not see much reason to use Gtablet as a phone but in case the battery is out or cell is not available, it is a good feature to have. As for using the G-tablet outside a WIFI Zone, I have "Wireless Tether" installed on my android phone. This way I am not dependent on the wireless carrier bring in Brazil or US, no matter who my 3G is coming from. All this from a non-rooted $269 tablet , I think I am getting more than I bargained for. By the way, I have not been able to share GPS and I have played with the recommended applications.