First, the secondary card also has an annual fee: Like the main card, the secondary card also has an annual fee, which is generally about half of the annual fee of the main card. Like the main card, most supplementary cards can reduce the annual fee by spending a certain number of times or a certain amount.

Second, the auxiliary card and the main card share the line: the auxiliary card and the main card share the line, and the line of the auxiliary card cannot exceed the main card.

For three years, the loss of the main card will not affect the use of the secondary card: except for the shared quota, the main card and the secondary card can basically be regarded as two independent cards. After the main card is lost, it will not affect the use of the secondary card, and vice versa.