How does World of Warcraft change its mailbox?

1. Enter official website, Battle.net, log in to Battle.net account with the modified mobile phone number, click the nickname in the upper right corner of the page, and select "Account" in the pop-up window.

2. Select "Security" on the left side of the page, as shown in the figure below.

3. Then find "Protect old recovery account with SMS" on the right page, and click "Update" next to it.

4. Select "Update Number" and click "Modify" according to the page prompts.

5. Click on the expanded list, select the security check verified by security order or SMS security protection, enter the verification code, and then click the "Submit" button below to complete.