Is Viber really secure?

Related questions

1. Can I use Viber without data?
2. What does Viber cost?
3. Is Viber safe for privacy?
4. Where are Viber messages stored on PC?
5. Can I use Viber on Computer?
6. Can I have same Viber account on two different devices?
7. Is Viber traceable?
8. Does Viber work without WiFi?
9. Is there Viber for Desktop?
10. Can you install Viber without a phone number?

Tags

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18. #authentication
19. #leads
20. #access
21. #ceremony
22. #called