How can I disable viber on my stolen device? My mobile phone has been stolen. How can i stop viber services process?

I need your urgent help to stop the people reach my friends.
Viber is linked to you phone number, not to the Device? Why don't you block your SIM-card (this will not deactivate your Viber), get a new card from your cell operator, then install and activate viber on it, then deactivate youe account?