When handling the CCB credit card, I wrote the reserved mobile phone number wrong, which made it impossible to mail the credit card. How to change the reserved mobile phone number and how long can it be changed? Bring your ID card to any CCB outlet and modify it through the financial counter. But since you don't have a credit card in your hand, it will take some time, at least three working days, and you must make it clear when you apply for amendment, otherwise the outlets may not accept it. But in fact, the wrong mobile phone number does not affect the mailing of the card. As long as your address is correct, you can still receive it. You can call the customer service hotline to check the registered letter code. With this code, you can track the logistics information sent.