The class group assistant does not display his name and mobile phone number because this function is turned off in the settings. You can turn it on according to the following steps:

1. Open WeChat on the mobile phone and enter the class group assistant.

2. click the three dot icons in the upper right corner and select the "more" option.

3. click "my nickname in this group".

4. Fill in the nickname you want to show in the input box and click the "Finish" button.

through the above steps, you can display your name and mobile phone number in the class group assistant.