The reasons are as follows:

1. The credit card limit has been exceeded;

2. The card has expired, the card has expired, the card has been frozen, and the card has not been opened. Not activated successfully

3. The credit card exceeds the set credit limit.

During transactions, sometimes the card issuing bank cannot process or make transactions. In addition to the above, there are other reasons. Generally, the transaction forms that are not supported by card issuance are mainly because the bank's magnetic strip is damaged, causing the ATM machine to be unable to recognize the bank card. Another possibility is that the bank card status is frozen, or the operation amount exceeds the balance in the bank card account.

When operating a bank card that has been reported lost at an ATM, the issuing bank may not support transactions. If the magnetic stripe is damaged, you can directly go to the bank to replace it. In other cases, you should contact the bank counter for confirmation.

Precautions for using bank cards:

1. When entering the password, be sure to cover it with your hands. If there is any abnormality in the password protection cover and card entry protection slot of the ATM machine, for safety reasons , do not use it, and inform the bank immediately;

2. In order to prevent fake ATM machines, customers should try to choose self-service banks with obvious signs and use ATM machines under the bank’s video surveillance;

3. It is best to store bank cards and ID cards separately, do not lend bank cards to others, and do not disclose bank card numbers and passwords at will;

4. When swiping cards for consumption[18], do not Keep the bank card out of sight and pay attention to the number of times the cashier swipes the card. When you get the purchase form and card, check whether the amount on the purchase form is correct and whether it is your card;

5. Activate your mobile phone SMS service allows you to keep track of account changes. Once abnormal transactions are discovered, call the bank immediately to report the loss;

6. If you suspect that funds have been stolen, you should immediately call the bank customer service number and report the loss of the bank card account in a timely manner. .

7. Do not put bank cards together with electrical appliances with strong magnetic fields such as mobile phones, TVs, stereos, microwave ovens, etc. It is best to put them far away. Do not keep multiple bank cards and passbooks together.

8. Use pieces of paper to separate cards as much as possible to act as a distance.

9. You can use special bank card holders or anti-magnetic card holders.

You cannot open more than 4 cards from the same bank

In December 2015, the China Banking Regulatory Commission issued the "Notice on Matters Concerning the Banking Industry's Combating New Illegal Crimes in the Telecommunications Network" (hereinafter referred to as "Notice"), the "Notice" stipulates that from January 1, 2016, in principle, the same customer shall not open more than 4 debit cards at the same institution (excluding social security cards). At the same time, the "Notice" also stipulates that "the same agent shall not open more than 3 cards at the same commercial bank in principle. Debit cards issued by an agent must be activated by the agent at the counter with his or her valid identity document before they can be used. ."