2, through the mobile phone WeChat query. First, you need to know which bank the balance card belongs to, and then enter the names of relevant banks in WeChat search, such as China Bank and Weizhong Bank. After clicking "Follow", enter the official account interface of WeChat, click "Small Loan", and "My Debit Card" and "My Credit Card" will appear here. The user will choose the binding according to the card type. Binding requires users to enter authentication information before they can query the balance in the card.