1
Launch the Viber app. Look for the Viber app on your smartphone. It’s the one with the app icon with the purple background and with a phone inside a chat box. Tap on it to launch it.
2
Go to More options. From the bottom menu, tap the icon with the three dots to reach Viber’s extended menu.
3
Go to Viber Out. From the More menu, tap the “Viber Out” item.
4
Check your credit balance. The Viber Out screen displays your current Credit Balance. This is the amount of money you have for use with Viber Out.
- Calling using Viber Out costs real money, and you need to have some prepaid credits to use it.
5
Buy credit. If you don’t have any credit or will like to load some, tap the “Buy Credit” button beside your Credit Balance. A menu of prepaid credit values will be displayed. Tap the one you’d like to buy.
- You have three options to choose from $0.99, $4.99, and $9.99.
6
Pay for the credit. Follow the on-screen steps to complete your purchase. Once the purchase is completed, the credit amount you’ve just bought will be added to your Credit Balance.
RESOURCE : WIKIHOW