Regulations for Administration on Type II Telecommunications Business Article 27-1

Mobile Virtual Network Service Operators or E.164 Internet Telephony Service Operator who provide service with prepaid card or other prepaid expenditure shall review and verify its customers' information weekly. If the users have activated service without user information, Operators shall inform the users of supplementing in one week. For the users who are overdue but don't complement, Operators shall pause their communication.Operators shall establish the regulations in the proceeding paragraph in their Code of Practice and service contract.
中文原文 第二類電信事業管理規則第27-1條
虛擬行動網路服務經營者或E.164用戶號碼網路電話服務經營者以預付卡或其他預付資費方式提供服務者,應每週複查其用戶資料,如有使用者已經啟用服務而無使用者資料之情事,經營者應暫停其通信。
前項規定,經營者應於其營業規章及服務契約內定之。

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