To enter a different phone number,

To enter a different phone number, please follow these steps:
Exit from this screen and start the Viber app.
Make sure that you are on the activation screen. Press the 'Back' button if necessary.
Enter your phone number without the country code, and press "Continue".
You should now receive your code by SMS. If you do not receive your code within 30 seconds, press the "No code" button.