Do both parties need WhatsApp to text?

Related questions

1. Should I use SMS or MMS?
2. How much does WhatsApp API cost?
3. What is twilio API?
4. Does twilio support MMS?
5. Can twilio send international SMS?
6. How do I send a message using twilio?
7. How does WhatsApp API work?
8. Does WhatsApp use SMS?
9. Where do I find SMS in settings?
10. What is the advantage of WhatsApp over SMS?

Tags

1. #although
2. #numbers
3. #connection
4. #therefore
5. #actually
6. #access
7. #telephone
8. #incur
9. #users
10. #internet
11. #mobile
12. #their
13. #parties
14. #whatsapp
15. #messages
16. #conversation
17. #calls
18. #contacts
19. #devices