If it is a China Merchants Bank credit card, if you need to modify the mobile phone number, the mobile phone number can only be bound to a unique number, then log in to the professional version of online banking (credit card), click "Customer Management-Modify Phone Number and Organization Name", Follow the prompts and take effect immediately. (Please confirm that your professional version has been associated with a credit card. Customers and supplementary cardholders who have not applied for the professional version should call the customer service hotline to modify their mobile phone numbers. The manually modified mobile phone number will take effect before 24:00 the next day)