What you want to ask is what if CCB can't find the unbind button? If you can't find the unbind button in China Construction Bank APP, you can try the following steps:

1. Open the China Construction Bank APP and click "My".

2. Slide the "My" page down and find the "Binding Device".

3. After entering the "Binding Device" page, click "Unbind" below. If the unbind button is still not found in the above steps, it may be necessary to check whether the correct bank card reserved mobile phone number is used for authentication. If the authentication fails, you can try to authenticate in the security center-device binding, or open the authorization management of the mobile phone construction bank and use the mobile phone to log in with one button for authentication.