Enter the WeChat official account personal center, and release the original bound mobile phone number according to the interface prompts. Then click the new mobile phone number of the binding and enter the verification code to complete the replacement binding. The specific replacement binding method is as follows:

1. Open China Post Express on the mobile phone WeChat, and the official WeChat account can be accessed. Click on more services in the lower right corner.

2. Click on the Personal Center to enter the pop-up more service options.

3. The page jumps to the personal center interface. At this time, you can see the mobile phone number 139 bound by the official WeChat account, and click the set gear sign to enter.

4. After the page jumps, click the Unbind Mobile Number button with the ending number of 4029.

5. Click Unbind in the pop-up Unbind Confirmation dialog box.

6. At this time, the page will pop up the prompt that the mobile phone number has been untied successfully, and click the Close button.

7. The page jumps to the official WeChat account interface of WeChat, and you can see that the original mobile phone was successfully unbound and the link of the new mobile phone number was bound. Click the link to enter.

8. In the interface of binding mobile phone number, enter a new mobile phone number and verification code, and click Bind mobile phone number.

9. At this time, the page will pop up a message that the new mobile phone number is successfully bound.

10. At the same time, return to the WeChat official account interface and see that the new mobile phone number has been successfully bound.