What's the difference between a secondary card and a primary card?

There are differences in payment, quantity and function.

1, since the mobile phone card is divided into the main card and the auxiliary card, it must be divided into the main card and the auxiliary card. In fact, these two cards are * * * with a package. Except for the extra charge, all packages of the secondary card are included in the package of the main card, which means that the secondary card enjoys the package business of the main card. In the process of using the secondary card, there is no need to pay again if there are no additional fees, such as telephone charges, traffic charges, SMS charges, etc. If these "free services" are included in the main card package, the secondary card can always enjoy such services.

2. The relationship between the primary card and the secondary card is somewhat similar to the mother-child relationship. When the service of the main card stops, the secondary card can't use this service. If the secondary card needs to be used independently, it must be re-applied at the business point of the network operator. In other words, the primary card bears the cost of the secondary card. Although they belong to the same package, the number of the secondary card is independent and different from that of the main card.

3. After two cards are bound to the same package, there must be a master card and a slave card. Under normal circumstances, the slave card * * * enjoys most of the packages of the master card, but some packages will provide additional functions for the master card, such as MMS, CRBT, etc. Although the number of people using MMS and CRBT is much smaller, some operators will provide these services for free. Generally, this service involves the main card and the auxiliary card, and will only be provided to the main card, not to the auxiliary card. In other words, in the function of the mobile phone card, the main card will be more than the auxiliary card.