In case you got a new phone number or have to change it, it is now possible to change your Viber number without having to delete it, thanks to the v.7.3 and the subsequent updates.
To switch phone numbers without losing your Viber account, follow the following instructions:
• Open the Viber app and go to the more screen
• Go to the Settings option, and touch Account
• Choose the “Change phone number” option
• You may be prompted to back up your chat history. Do so if required.
• Input your new phone number in the next page and tap continue
• Verify your new number.
Now your phone number is switched successfully.