First, modify the mobile phone number information in the login settings:

Step 1: Log in to the seller backend, click [Settings] in the upper right corner to expand the [Account Information] below.

Step 2: Click [Login Settings (Change Name, Email, Password and Security Settings)] under [Account Management] in the lower right corner. If it shows that you need to enter a verification code, just enter the original mobile phone number for verification.

Step 3: Select [Two-step Verification Settings: Manage Two-step Verification Authenticator] under [Login and Security] and click [Edit];

Step 4: On the [Two-step Verification Settings] page, you will see that the modification methods for [Preferred Method] and [Alternative Method] are the same. Click [Change]. If you are prompted to need a verification code in this step, enter it and verify it.

Step 5: Enter the new mobile phone number to be modified in the input box, select [CN +86] and click [Continue]. The new mobile phone number receives the verification code, enter it and click [Continue] to successfully modify it.