The reasons why the card cannot be used may be as follows.

First, the card status is abnormal, such as card degaussing, chip damage, etc.;

Second, the card does not support transactions, such as VISA single-logo cards/JCB single-logo cards. UnionPay transactions are not supported, and some online transactions are not supported;

Third, there is no problem with the card. The POS machine signal is not good, and the transaction will fail if it is not connected to the network;

Fourth , IC chip credit card, because UnionPay has closed the downgrade transaction function, if the cashier still operates the transaction by swiping the card instead of inserting the card, it will also become unusable;

Fifth, transactions on some overseas websites , does not support domestically issued credit cards, or does not support credit cards from China Construction Bank;

Sixth, the credit card limit is insufficient.

Extended information:

Consequences of overdue credit cards

1. Liquidated damages, usually 5% of the unpaid portion of the minimum repayment amount.

2. The interest is high, and the interest is compounded. The interest rate is very scary when the debt is large.

3. Overdue credit records will be stained, resulting in the inability to handle financial needs such as house purchases and loans within the next two years.

4. If the payment is overdue for more than 3 months, and the amount exceeds RMB 10,000, and the bank has failed to pay multiple reminders, you will not only have to bear the repayment, but may also bear criminal liability.

China Construction Bank-Card Security