What does mobile phone secondary card mean?

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The secondary mobile phone card is also called a sub-card, which means a mobile phone number that is different from the main card phone number, but a mobile phone card that shares the package with the main card. When paying with the primary card, the fees for the secondary card are included in the package of the primary card, and the primary and secondary cards can be paid together. This topic provides you with various articles, downloads and courses related to mobile phone supplementary cards.