After a lot of searching and contacting Viber, I found out that, such version of android does what is regarded as unusual activity by Viber. This results in blocking all phone numbers used in such version of Android.
To unlock my phone number, I insisted sending messages to Open a Ticket, explaining the situation. They sent an email and I had to explain again as a reply to that email. Their first answer was a template answer:
Our system has identified your account as a source of spam messaging
due to an increased activity on Viber. The account has been
automatically added to a block list and can not be unblocked.
No further information is available at this time. Please do not reply
to this e-mail.
And I opened another ticket explaining that I could not be a spammer only in a few minutes. This time they had a non-template answer:
Your numbers seems to be blocked at this time due to unusual activity
on Viber. We have unblocked them and you should be able to register to
Please note that if your numbers are blocked again after being removed
from our block list, we will not be able to unblock them in the
Best regards, Orlando Viber Support Team
So the answer is that such widely used virtual versions of android are in Viber black list and may result in clocking your phone number in Viber.