The main credit card and the supplementary card can generally be distinguished according to the following methods:

Judged by the limit. The main card has a higher limit than the supplementary card;

Using the annual fee to judge, the annual fee of the secondary card is generally lower than that of the main card;

Using the management rights to judge, the main card has higher rights, and the main card can Cancel the supplementary card and recover the credit limit of the supplementary card;

Judging by the application conditions, you must have the main card before you can apply for the supplementary card.