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How does China Mobile view the secondary card number?

China Mobile inquires about the number of the secondary card as follows:

1. Open the mobile phone business hall client or log in to China Mobile official website.

2. In the main interface, find and click the "secondary card management" option.

3. On the secondary card management page, find and click the "secondary card query" option.

4. You will be prompted to enter the secondary card verification code. Enter the correct verification code to query the secondary card number.