Can the secondary phone card know when to call and send a message?

No, because the secondary card only binds the fee to your main card, and you can enjoy at most some traffic or telephone charges. Everything else exists independently. Although it is called the same as the main and secondary cards of credit cards, it is different in essence, so the calling card is called the secondary card, but it is still an independent number.

When using a universal secondary card, the traffic in the secondary card package is preferred. After the resources in the secondary card package are exhausted, you can enjoy the free resources in the main package. After the free resources in the primary package are used up, they will be charged according to the charging rules for foreign investment in the primary package. The charges for traffic, voice and short multimedia messages outside the universal secondary card set shall be implemented according to the foreign charges of the main card set.

Matters needing attention in supplementary card business for extended data main cartoon:

1. The universal secondary card is only allowed to handle happy online business (short number group chat network), and it must be in the same short number group as the main number. No other business is allowed. Note: When the universal secondary card does not handle happy online business, the number of the secondary card is too long to dial the number in the main number cornet group, and the number in the main number group will be charged.

2. The main number needs to apply for the 4G main package in 58 yuan and above before it can apply for the secondary card.

3. The secondary card can only be activated after real-name registration.