Question: how to make free long distance calls using internet?
Answer: Viber. Viber is one of the most popular apps for free international calls. ... 
WhatsApp. Another commonly used app is the Facebook-owned WhatsApp. ... 
FaceTime. If you're connecting to another Apple user, you can use the built-in FaceTime app. ... 
Skype. ... 
Rebtel. ... 
IMO. ... 
PopTox. ... 
LINE.