1. Telephone inquiry: Call the customer service hotline of the bank card issuer, and ask the customer service staff for help by connecting the hotline to obtain complete bank card number information. The official customer service hotline of the bank can be obtained through various channels. For example, if you check the nearby outlets on the map of Gaode, you can have a bank phone number, or you can query directly through Baidu.

2. Counter inquiry: If you forget the bank card number, you can bring your ID card to the counter of a nearby card-issuing bank outlet for inquiry.

3. official website inquiry: If you forget your bank card number, you can directly log in to the issuing bank official website and enter the personal online banking, and then you can find relevant service functions to inquire your bank card number.

4. Mobile banking inquiry: Users only need to download an official bank app themselves, then register and log in to their own account, and after logging in, they can see their complete bank card number. If you want to check the card number of China Construction Bank, please log in to China Construction Bank app 1, click on the three bars in the upper left corner to open the side menu bar; 2 Select the security center and click the information switch; 3 Select "My account shows all accounts" in the page, and then click the option on the right to open it; 4 Return to the CCB app interface, select Wealth, and then open "My Wealth Center" to see the complete bank card number.