Is it safe for online banking to receive the verification code from the old mobile phone number?

There is no risk in using someone else's mobile phone number to get a bank card and get a verification code. When handling bank cards, it is best to use my mobile phone number, or bind business, use someone else's mobile phone number to handle bank cards, and then get the verification code, which will not pose a threat to the owner. However, when the bank notifies some ideas or changes in the bank card business, it will be sent to other people's mobile phones, and it is inconvenient for cardholders to receive information. So it's best to use his mobile phone number when handling business.