What does China Unicom supplementary card mean?

China Unicom's secondary card refers to the unified account of the primary card and the secondary card after the secondary card opens the designated primary package. All members can pay fees and enjoy the balance of telephone charges. The main card is still charged by the main card, and the auxiliary card can enjoy the voice, traffic, SMS and other resources in the domestic main card package.

Take Fujian Unicom's "3G supplementary card for relatives and friends (this package has been discontinued)" as an example: 6 yuan, a supplementary card for relatives and friends, gives away caller ID (can be cancelled). The secondary card enjoys the voice, traffic, SMS and MMS resources in the main card package in China. If it is exceeded, it will be charged according to the 3G master card package standard, and the communication expenses generated will be included in the master card. The interaction between the main card and the auxiliary card is normal, and it is charged according to the main card package. The main card and the supplementary card need to form an account.