Make free mobile calls for India, US and Canada with Dingaling App

There are so many sites which are providing free calls, but actually they give only 2 minutes free, just as a sign up bonus. But today, I'm going to tell you about a mobile app which offers free voice calling to India, US, China and Canada. The app is called Dingaling App which is available for Android and iOS. Using this app, you can call your friends on mobile and landlines. It is not