1. SMS query: Use the mobile phone number reserved in China Construction Bank to edit the text message "last 4 digits of CCZD card number" to 95533 to query.
2. Inquiry at CCB outlets: Bring your ID card and credit card to CCB outlets for enquiries.
3. Telephone inquiry: Call the CCB Credit Card Center and follow the voice prompts or transfer to manual customer service for inquiry.
4. Online banking inquiry: Log in to China Construction Bank's personal online banking and select the "Account Inquiry" function in the "Credit Card" service to inquire about credit card arrears.