To get enrolled at Bielefeld University, you have to apply directly at the student's office (Studierendensekretariat). You will find the office at D0-104.
You can get more information about the procedure at the student's office or at their
The UniCard is the NEW Card at Bielefeld University which substitutes all older cards. The card has the following functions:
How to get the UniCard:
After that you can start using it.
As an enrolled Ph.D.-student at Bielefeld University you will get the "Semesterticket" to use all buses, trams and trains in North-Rhine-Westphalia. To get the ticket you have to pay the social contributions ("Sozialbeitrag") and it will be sent to you by mail. The ticket is valid for the whole semester.