Below is part of the Minnesota State System Procedure 1C.0.1 Employee Code of Conduct. Procedure 1C.0.1, Part 3 (Employee Ethics), Subpart D (Use of state property) states that long distance services, business cell phones (including data plans) can not be used for personal or private purposes.

Subpart D. Use of state property. All system property is also state property. With limited exceptions, state property is not to be used for personal or private use except as specifically authorized, such as limited personal use of computers as provided in System Procedure 5.22.1 and incidental use of system cell phones, as provided in System Procedure 5.22.1.  State long distance service or frequent flyer miles earned through state-authorized travel for state- related purposes may not be used for personal or private purposes.