Can Unicom's primary and secondary cards be interchanged?

If the primary card and the secondary card have no contract at present, they are interchangeable. But you need to go to the business hall to check whether your previous package is on sale. If it has been taken off the shelf, there is no way to deal with it. Specifically, you can go to the local Unicom's own business hall for consultation.

It can be changed to the target tariff of the same platform, and can be changed to other package sales in the last month of the agreement between the master card and the slave card, but the slave card business needs to be cancelled first. Please consult 100 10 for details.

Usually, you can go to Unicom's own business hall to handle the exchange of main and auxiliary cards. In some areas, intermodulation between the primary card and the secondary card is not supported. It is recommended to consult in the business hall. The specific situation is subject to the actual handling of the local business hall and the latest local policies.

The number of the secondary card (slave number) can be changed to the main account number, and you can bring the original ID card to the Unicom business hall. Local and municipal policies are different. The actual situation is subject to the policy of Unicom to which the number belongs. For details, please also consult Unicom's manual customer service.