How to cancel the association between Unicom's secondary card and the main card information?

If the secondary card of Unicom needs to be disassociated from the information of the primary card, the owner can take his valid ID card to the main hall of Unicom where the number belongs to split the primary card and the secondary card, which is subject to the actual operation of the business hall. Please consult Unicom customer service for the address, certificates and precautions of the business hall.

Tips: Take Jiangsu Province as an example. There may be differences in policies among provinces and cities, and the attribution policy shall prevail.