The reason should be that the mobile phone operator reissued the mobile phone number after taking it back, but the mobile phone number was not unbound. After the cancelled mobile phone number was renumbered, the original owner still did not unbind the bank card from the mobile phone. With the increasing popularity of mobile payment, once the mobile phone number is not "unbound" from the bank card and various accounts after cancellation, various accounts of the original owner of the mobile phone number are at risk of being stolen.

When the user's mobile phone number is changed, if it is not handled properly, there is a risk of personal information leakage, financial loss and some accounts being difficult to retrieve. After the mobile phone number is changed, the user should modify the bank card and credit card bound to it in time.

Extended data:

Unbind these three types of information before discarding the mobile phone number.

(1) online banking account number.

(2) Common social media accounts.

(3) Common email accounts.

These three types of accounts are frequently used, and once they are cracked, the losses will be great. Therefore, before changing the mobile phone number, the mobile phone numbers of these three types of accounts must be untied.

People's Daily Online-After the original owner cancels the number, the novice mobile phone number can check that others' Alipay is not "bound".

People's Network-Mobile phone number change is not untied, which is a huge risk. Experts suggest changing three types of information.