Why does the secondary card have previous information?

Explain that this number has been used by others before, but it was cancelled by the mobile company because of long-term arrears. The mobile company cleared the number data record and put it back on the market. However, the former owner of this number used this number to register the services of other companies (such as bank card transaction SMS notification, Alipay QQ WeChat binding, etc.). ). Since these services are not provided by the mobile company, the service provider will continue to provide services after the user data is cancelled by the mobile company.