The query methods are:

1. Call the credit card customer service hotline of the relevant bank, follow the voice prompts to transfer to manual service, and explain to the customer service staff that you need to query the mobile phone number bound to the credit card.

2. Go to the business hall of the relevant bank and ask the lobby manager. They can help you quickly check it.

3. Log in to the website of the relevant bank, log in to your account, and click on the relevant query function to perform operations. Or contact the online customer service staff directly on the website for enquiries.