I know you are trying to search easy way to call international with cheap Price. You had searched and found it now. I have been using this app and called thousands time since 2013 and it worked good for me. I am trying to share you guys as well.
It is the easiest way to call. Go to your app store and search RebTel and you need just enjoy the cheapest call over wifi or your free minutes.
Click here to try.