What message does Unicom send to unbind the primary and secondary cards?

Unicom can't send SMS to unbind the primary and secondary cards. Can only go to the business hall. Release method:

1. If the main card and the auxiliary card with different account names want to dissolve the relationship between the main card and the auxiliary card, both parties must go to Unicom's own business hall where they belong to handle it in person with valid identity documents.

2. If the main card and the auxiliary card with the same account name want to terminate the relationship between the main card and the auxiliary card, they should go to the business hall where they are located with the original valid ID card of the owner (the handler carries the original valid ID card of the owner and the original valid ID card of the handler). Tips: It can only be handled when it is available normally.