Administrative Regulations on the Establishment and Operation of the Dedicated Taxi Telecommunications Network Article 24

Where the telecommunications network establisher applies for returning the radio frequency prior to the expiry of frequency use certificate, the Ministry of Digital Affairs shall revoke the frequency use certificate and the competent authority to revoke the network approval certificate.
中文原文 計程車專用電信網路設置使用管理辦法第24條
電信網路設置者於頻率使用證明屆滿前,申請繳回無線電頻率者,數位發展部廢止頻率使用證明、主管機關廢止網路審驗合格證明。

English translation for reference only; the Chinese text prevails. Not legal advice.