When ever we read about free calling Android app or iPhone app the first thing that we look for is,whether the other user should have the same app that he is using for calling purpose ie many apps only provide app to app free calling.Yes there are also apps which facilitate app to calling to real mobile or landline numbers,but in this case free calling is not there you will have to burn some bucks to get connected to your dear ones who are in your country or abroad. Dingaling a new free voice calling app for Android and iPhone