I just received a short message from Bank of China, saying that it is the mobile phone transaction code that needs to be provided for online banking transactions, but I don't think I have the purchase

I just received a short message from Bank of China, saying that it is the mobile phone transaction code that needs to be provided for online banking transactions, but I don't think I have the purchase order at all. After you confirm that your mobile phone is lost, the bank will be responsible for any loss before your account is reopened!

So it doesn't matter.

You received the text message. Are you sure it was sent by five digits starting with 9 in the bank?

Pay attention to the existence of scammers and number changers.