How do WhatsApp calls work?

Related questions

1. Can I call a landline with WhatsApp?
2. Can the government listen to WhatsApp calls?
3. Does WhatsApp show online when calling?
4. Can you make free phone calls on WhatsApp?
5. Can Police Track WhatsApp calls?
6. Is there a limit on WhatsApp calls?
7. Can I WhatsApp call on laptop?
8. Does WhatsApp calls use a lot of data?
9. Can I use WhatsApp to call someone without Whatsapp?
10. Are WhatsApp calls free on WIFI?

Tags

1. #place
2. #connection
3. #mobile
4. #based
5. #chargeable
6. #whether
7. #however
8. #charged
9. #viber
10. #calling
11. #voice
12. #offering
13. #skype
14. #whatsapp
15. #internet
16. #service
17. #other