CCB changed the reserved mobile phone number. Why did the text message get sent to the original mobile phone?

1 Log in to CCB Personal Online Banking and click Customer Service. \r\n2 Come to the customer service column. \r\n3 You can see the customer's mobile phone here. If you are not an online banking signing customer, you can better bind your mobile phone here. You can re-log out and re-register your mobile phone. If you are a contracted user, you can only change it at the front desk. \r\n4 Click Security Center. There is also a mobile phone number binding service, namely SMS. \r\n5 Select SMS reminder settings. \r\n6 Some customers can make changes here, while others can't. If they can't make changes here, they can only go to the front desk. \r\n7 What users can change by themselves is the bound mobile phone of some services. As for the reserved mobile phones, they must only go to the front desk to exchange them, and bring their ID cards, bank cards and new mobile phone numbers. It is better to go to the front desk to change your mobile phone, and it is better to log in to the online business hall to see if it will take effect after changing your mobile phone. Some CCB users will obviously change their reserved mobile phones, and SMS reminders will still be the original mobile phones. Because only the mobile phone was changed, the staff at the front desk did not change the corresponding SMS reminder settings.