There are three ways to change the mobile phone number reserved for Hua Xia Bank's credit card:

First, the cardholder can directly call the Hua Xia Bank credit card customer service hotline 400-669-5577 to use the original mobile phone number. After leaving your mobile phone number for identity verification, inform customer service of your change requirements. After confirming your identity, your new mobile phone number will take effect immediately. However, if you call from a non-reserved mobile number, the change will take effect the next day to ensure account security.

Secondly, if the mobile phone number reserved on the credit card needs to be changed due to loss, it is recommended that the cardholder bring their ID card and credit card to a Hua Xia Bank counter branch to make the change. This can ensure that the information is updated accurately.

Regarding the application for a Hua Xia Bank credit card, qualified individuals must be over 18 years old, have legal sources of income and have good credit. They only need to provide valid identity documents to apply to the card issuer. For the main card, the applicant can apply for a supplementary card for his or her qualified immediate family members, such as persons over 15 years old with limited capacity for civil conduct or minors under the age of 18, but the consent of the legal representative must be obtained. The cardholder is fully responsible for the debt incurred by the supplementary card.

The above information comes from the official website of Hua Xia Bank. For more detailed credit card operation guidelines, you can visit the official website of Hua Xia Bank.