According to the regulations of the Ministry of Industry and Information Technology on port number transfer:

Individual customers who have registered their real names, have no arrears, have normal customer status, have no activities with agreed time limit on the Internet or have business that affects others' use or payment, and have been transferred to the Internet for 120 days since the last time, can apply for network transfer if all the above conditions are met.

This loan was accepted by the operator who paid the phone bill in advance, and the operator's fee was not settled before, which led to the display of the loan.