General banks can handle primary and secondary cards.

1. In terms of card cancellation. The main cardholder has the right to request the cancellation of his supplementary card; while the supplementary cardholder cannot cancel or cancel the main card on his own initiative.

2. Credit limit. The credit limit of the primary card is only subject to the requirements of the bank; the credit limit of the secondary card is designated by the primary cardholder on the premise that it does not exceed the credit limit of the corresponding primary card. If the primary cardholder does not specify the credit limit, , the credit limit of the supplementary card is the same as that of the main card. Extended information

Repeating or consecutive numbers

Many banking systems will set up automatic exclusions, such as setting passwords such as AAAAAA, AAABBB, AABBCC, ABCABC, and ABCDEF. The banking system It will automatically prompt that the setting cannot be successful, and the bank staff will ask you to reset it; it should be noted that this is the default setting of the system program, and the password entered is not visible to bank staff.

Not consistent with APP passwords

Basically, everyone has a few to dozens or hundreds of APPs on their mobile phones. Once an APP registers an account, it must set a password. . For this kind of situation, my personal suggestion is: one password for all APP series; another password for all bank cards. Two sets of passwords, different from each other, one is easy to remember, and the other is safe. It is extremely easy to leak the APP password. Once the two passwords are the same, the bank card password is no longer safe.

Baidu Encyclopedia-Bank Card