There are several possibilities for the ID number to be blacklisted: ① The mobile phone number is in arrears. ② There are more arrears for fixed telephones. ③ Outstanding bank loans. 4 The credit card was maliciously overdrawn. (5) There are criminal records in the Public Security Bureau that have not been sold. There is a case pending in the court. ⑦ The ID card was fraudulently used by others, committing the mistakes listed in items (1) to (6) above. The department concerned made a mistake and wronged her.