Why can't the secondary card * * enjoy the free SMS of the main card without free SMS?

Different types of secondary cards have different resource ranges. For example, the national primary and secondary cards of Sichuan Unicom (one package) can * * enjoy the voice, data traffic, MMS messages and traffic presented by the primary card, while the secondary cards cannot * * * enjoy the voice, traffic and MMS messages presented by the primary card. If your secondary card can't enjoy the free SMS of the main card, it doesn't rule out that it is caused by the free SMS given by the system. For details, please contact Unicom's manual customer service for consultation. The actual situation is subject to local policies.

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4G primary and secondary cards:/02 UPY;