Does WhatsApp use data or airtime?

Related questions

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3. How much data does a WhatsApp text message use?
4. Can a WhatsApp call be traced?
5. Is it free to use WhatsApp internationally?
6. How much data does a 1 hour WhatsApp video call use?
7. Can WhatsApp be tapped by police?
8. Who pays for a WhatsApp call?
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Tags

1. #internet
2. #message
3. #receive
4. #friends
5. #whatsapp
6. #every
7. #family
8. #charges
9. #phone
10. #available
11. #messages
12. #mobile
13. #apply
14. #additional
15. #roaming
16. #connection