Please first determine whether you want to modify your bound mobile phone or the business contact mobile phone, and then follow the steps below:

1. Modify the bound mobile phone number

1. Log in to the "My Alibaba" homepage, enter "Account Management" in the search box on the right side of the blue navigation bar, click Search, and you can find and enter "Account Management" in the service;

2. Click the "Account Security" button, and then click "Modify" after logging in to the mobile phone; follow the prompts on the page.