I am thinking the more flexible way to talk internationally without spending main balance. Yes whats whatsAPP is giving only through message transfer. But if we can talk directly through one application, then it would be a huge gain for the users and lose for telecom providers. I am not telling about video conference, also audio conference. I do not know whether such app is available or not. If the app is not available, then it would be a huge. I would try to work on that. Please XDA members give me suggestions on this.