I need to make international landline/mobile calls. My laptop with Debian is failing me [here](http://askubuntu.com/questions/177611/x220-mic-not-working-in-debian) and iPad failing [here](http://apple.stackexchange.com/questions/61146/google-voice-in-ipad). I want to use Google Voice because it is far cheaper than my local carriers. So how can I call (and use Google Voice) in my Android -phone?