There are many online payment methods that may be used by fraudsters, such as asking you to reserve the mobile phone number provided by the other party when opening the card for some reason, and then finding a specious reason for you to deposit money on the card. When a swindler tries to transfer the funds in your account, the bank will send a verification code (equivalent to a password) to your mobile phone. Once the mobile phone number bound by the bank card is reserved for the mobile phone number of the other party (that is, the liar), the money will naturally be transferred away by the liar.