How can I cancel the China Unicom supplementary card if I don't want it

1. Open the China Unicom App and log in.

2. In the main interface of China Unicom App, click the "Business Service" function button to enter the function menu.

3. In the "business service" function menu, select the "secondary card management" option to enter the secondary card management interface.

4. In the secondary card management interface, find the secondary card to be cancelled, and then click the "Cancel" button in the secondary card information column. You will be prompted to confirm whether you want to cancel the secondary card, and then click OK.

5. It will take some time to wait for the system to automatically cancel the secondary card. After successful logout, you will no longer be able to use the secondary card.