How to distinguish parent-child cards

The method of distinguishing parent-child cards is as follows:

1. The difference between a supplementary card and a parent-child card is that the supplementary card is an accessory card of the main card, and the tariff is the main card. The secondary card uses the tariff and flow of the main card, while the parent-child card is an independent card, which is different from the secondary card.

2. The cost of the parent-child card can be paid separately by the main card. You can't use the phone bill and traffic of the main card with your own tariff and traffic, so there is a difference between the supplementary card and the parent-child card.