Viber is one of the most popular instant messaging apps on the market.
If you decide however to close your account, I’ll explain below what you need to do:
1 Click on More > Settings
when you’re in the Viber app
2 Select Privacy
3 Deactivate account
is an option you will discover when you scroll down now.
4 Confirm the deactivation
and be aware of the fact that you’re about to remove all data with your account.
Your account has successfully been deactivated. You’re now free to delete the app from your iPhone or Android phone.
Source screenshots: Viber app on iphone