Question: app to do international calls?
Answer: WhatsApp. The world's most popular communication app. ...  WeChat. China's #1 chat app. ...  Skype. For the business person on the go. ...  Rebtel. WiFi free international calling. ...  LINE. For emoji fiends. ...  Viber. Make calls to landlines. ...  Google Voice. For traveling in the U.S. ...  Voxofon.