It may be because the card is frozen, or the card core may be damaged.

The general reasons why a credit card cannot be used are as follows: 1. The card is not activated. When we apply successfully or replace the card, we need to activate the card. Without activation, it cannot be used.

2. If the chip is damaged, we can go to the counter of the card-issuing bank's branch to try the card. If it is confirmed that the chip is damaged, we can go directly to the counter or call the bank's credit card hotline to apply for a card replacement.

3. Card freezing The bank system monitors credit cards. If any abnormalities are found in the credit card, the system will freeze the credit card to reduce the cardholder's losses. You can call the customer service hotline or bring your ID card to the bank for unfreezing procedures.

4. The card has expired. The validity period of the credit card is usually displayed on the card. If it is found to be expired, we can directly call the bank's credit card hotline to renew the card.

A credit card, also called a credit card, is a credit certificate issued by a commercial bank or credit card company to consumers with qualified credit. It takes the form of a card with the issuing bank's name, validity period, number, cardholder's name and other contents printed on the front, and a magnetic stripe and signature strip on the back.