Telecommunications Universal Service Regulations Article 18

Universal service providers shall not reject any service applications in the areas in which they serve without eligible reasons; apart from the approved fee charges, the providers are not permitted to charge subscribers extra costs.
中文原文 電信普及服務管理辦法第18條
普及服務提供者於其提供普及服務之地區,無正當理由不得拒絕用戶要求服務之申請;除經核准之資費外,不得向用戶收取額外費用。

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