The steps of coding Huawei mobile phones are as follows: 1. Open the Pydroid3 application and click the "+"button below to create a new file.

2. Enter the code in the new file. You can use any text editor to write code, such as Notepad or text editing.

3. Save the code file and open it in Pydroid3.

4. Click the "Run" button in the upper right corner, or press the "Ctrl+Enter" shortcut key on the mobile phone to run the code.