Regulations on Users of Telecommunications Businesses Inquiring Communication and Account Records Article 7
Records for subscribers’ inquiries about communication records and accounting records shall be kept by the telecommunication enterprise for two years and destroyed after the expiry date.
中文原文 電信事業用戶查詢通信紀錄及帳務紀錄作業辦法第7條
用戶查詢通信紀錄及帳務紀錄之請求紀錄，電信事業應保存二年，逾期予以銷毀。