Aircraft Flight Operation Regulations Article 289

To prevent interference with navigation and telecommunications during flight, all personal portable electronic devices used by airman, cabin crew or passengers shall comply with Article 43-2, paragraph 2 of the Act.
中文原文 航空器飛航作業管理規則第289條
航空器於飛航中,為避免航空器飛航或通訊遭受干擾,航空人員、航空器上工作人員或乘員應依本法第四十三條之二第二項公告之限制規定使用個人電子用品。

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