Why do I get offline on the Viber when I use keypad although I have the Internet connection and I don't close the application?
There could be a couple of reasons why you appear offline:
The SYNC option is not turned on, therefore sync is done at certain intervals showing you offline. To enable this, pull down the notification are, and swipe the bar with functions from right to left. Activate sync and wait.
There is a bug in the application. You can always reinstall Viber as your account won't be deleted if you do this.