How to uninstall and reinstall Viber:

1.  Select Viber in your devices Home window.

2. Press on the Viber icon for more than a second.  A pop-up menu will appear

3. Select 'Delete'.

4. Download Viber from the BlackBerry App World or from http://www.viber.com and install it.

5. After re-installing, set Viber up again.

Note that you can use the same access code as before, or receive a new one by registering your number again.

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