We are enclosing a response from Viber's Support organization on how to get the Authentication code
"Please try removing Viber, wait 24 hours, reinstall and try again (make sure you try both the SMS and the automated call options).
In addition, you may try to register to Viber with a different number (for example - your home landline number, a friend's number, etc.), in order to determine whether the problem is specific with your number, or a general one.
If this doesn't help, contact our support team at http://support.viber.com and give them the details of the problem. "
Delay in receiving Viber Activation Code?
Some users have reported problems with receiving the Authentication code. Some users have either no received the code at all, some others have experienced long delays and dropped calls. Please note that the delay in receiving the activation call is an issue that Viber Support deals with, this is not a BlueStacks issue.
Here are a few helpful posts from Viber's site.
Detailed FAQ's can be found at http://helpme.viber.com/Knowledgebase...