Viber, the popular iPhone application that allows for free calling to other Viber users, has been updated to version 2.0.1. After applying the update, Viber users will be able to send and receive free text messages to one another, complete with notifications. Viber has also been updated with a number of UI changes — the favorites have been moved, the calling mechanism has been improved and now shows the current state of any Viber call, and the application now has a deactivation feature. The update is availa...