N.C. Gen. Stat. § 148-23.2

Except as authorized by Division of Prisons of the Department of Adult Correction policy, no person shall possess a mobile telephone or other wireless communications device on the premises of a State correctional facility. Notwithstanding the provisions of this section, an employee or visitor may possess a mobile telephone or other wireless communications device within the confines of a motor vehicle located in a designated parking area of a correctional facility's premises if the mobile telephone or other wireless communications device remains in the vehicle and the vehicle is locked when the employee or visitor has exited the vehicle.