The details of this years free sim card offer are online. You can find them here (its a bit long but our team members will answer any questions when you get the card). There is a new flatrate option which is highly recommended. Basically you can call all fellow exchange students who get the same card for free (actually any number in the same network and also all regular Austrian landline numbers) and still have 1000 minutes per month to make calls to other networks. In order to get the free sim card you need to get an ESN card in one of our office hours.