Administrative Regulations of Amateur Radio Operators and Radio Stations Article 26

The call sign of an amateur station shall be assigned by the competent authority on the issuance of the amateur station license. However, the call sign may be assigned directly by the competent authority when the application is made for establishing a temporary station.No amateur operator shall be allowed to request the assignment of a certain call sign. However, the competent authority may assign the call sign as applied for when the call signs of the temporary station meet the requirement of Article 27 and this does not cause duplicate assignments.When having obtained the qualification for a higher class, the amateur operator may apply to the competent authority for changing the call sign of the originally established amateur station.Once the call sign of the aforementioned amateur station has been reassigned, the former call sign shall be returned and shall no longer be used.