Can't activate Viber

Hello,
I have a Lumia 620, and have been using "Viber Messenger" app from one month ago with no problems.
But now, "Viber" application released and it supports Voice Call and other features. But after installing it, when I enter my phone number, it says: "No Viber Service. Viber service is currently unavailable or being blocked. Please try again later."
But Viber Messenger app is already working on my phone. Also Viber is working on my friends android phones.
my data connections are Wi-fi and GPRS (EDGE)... both has the same problem with new Viber, and Viber Messenger is working on them.
I also tried to use a Proxy Server to prevent our government censorship policies, but the problem persists.

What should I do?

have u tried to delete it and re install it?

Just reinstalled Viber, and problem still exists :(

Now it passed the activation stage, but stuck at "your details" page with same error :((

I made fix of this by MITM server http://viber.uax.co