@Usta - Video calls in Viber and a PC/Mac version are two things we are considering to develop. Stay tuned for updates.
@jimmyr - we didn't dupe your details. Our Beta version is a closed-group project, and we can't instantly allow all subscribers (we have tens of thousands) to immediately start using the Beta. When we launched the Beta, we officially announced that there is an order to which users will receive the application - first-sign first-get.
So what you need to do now, like all other subscribers, is wait until you receive the invitation email from us. Only then will you be able to complete the setup and use Viber on your Android.