What should I do if the credit card number and password are known? Because the credit card has the function of overdraft, the safety of using the card has always been a hot topic. There are often incidents of credit card theft in the society, which makes people feel scared. So, what if the credit card number and password are known? As we all know, the card number and password of a credit card are two important information for the security of the card. Besides, the validity period, verification code and reserved mobile phone number of the credit card are also very important. If your credit card number and password are known, you must pay attention to it. If your credit card has online banking, others can complete "card-free payment" through the card number, expiration date and verification code, usually online payment and telephone payment. < /p > In addition, the credit card must not be lost. Once it is lost, others can make a barrier-free consumption, because the important information of many cards is directly printed on the card. < /p > what if the credit card number and password are known? In fact, whether it is the credit card number, password, validity period or verification code, it is important personal information that cannot be leaked, and the password leakage should be changed as soon as possible. In addition, to ensure network security when shopping online, it is best not to conduct online transactions in public online places such as Internet cafes, shopping malls and cafes. As long as cardholders can protect their credit card information, they can enjoy the convenience and benefits brought by credit cards with peace of mind.