With the popularity of 4G networks and the increasingly fierce competition among the three major operators, they have launched many special services in order to attract customers and retain users, while the main card and the auxiliary card are actually for the convenience of "family-oriented" users to "manage" the paid package business with one click. But many people don't know the difference between the main card and the auxiliary card. This paper will talk about the difference between the main card and the auxiliary card provided by the network operator.

First, there are differences in payment.

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. Actually, these two cards are for a set meal. 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.

Second, there are differences in numbers.

The relationship between the primary card and the secondary card of a mobile phone is somewhat similar to the mother-child relationship. When the service of the primary card stops, the secondary card cannot use this service. If the secondary card needs to be used independently, it must be re-applied at the service 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.

Third, there are differences in functions.

After two cards are bound to the same package, there will inevitably 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 there are fewer people using MMS and CRBT now, 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.

To sum up, I believe you have a certain understanding of the difference between the main card and the auxiliary card. In fact, these differences are of little use. What is really useful is two points: * * Enjoy the package, and the supplementary card is free of monthly rent.