This means that the cardholder can't use the credit card normally and the personal information authentication fails. This situation is mostly caused by poor signal of POS machine, abnormal user operation and degaussing card. If this happens, the cardholder can bring a valid ID card and credit card to the bank outlet to ask the reason. After solving the problem, it can be used normally the next day.

What is the reason for degaussing credit cards?

1. The strong magnetic field generated by high-frequency electromagnetic waves of many electronic devices, such as mobile phones and tablet computers, will magnetize credit cards, leading to confusion in recording information and invalidation of credit cards.

2. Some backpacks, wallets and pockets are sewn with magnetic buckles, which will be demagnetized if the cards are in direct contact.

3. The induction cooker, microwave oven, TV and refrigerator at home are all surrounded by high magnetic fields, which will also lead to degaussing of credit cards.

4. In public places, bus card readers, and some hospitals, inspection equipment, such as nuclear magnetic resonance apparatus, can easily lead to degaussing of credit cards.

5. Credit cards and bank cards are stored relatively close, and the magnetic strips overlap or are not used for a long time, which will also degauss the credit cards.

6. The magnetic stripe of a credit card will be worn, scratched, twisted or broken when it encounters sharp objects, and it will also be demagnetized.