To turn off the charging beep for Huawei mobile phones, please do as follows:

1. Click the "Settings" button on your phone, and then click "Sounds and Vibration" on the page.

2. Find the "System Sound Effects and Vibration" option on the "Sound and Vibration" page, and click to enter the page.

3. On the drop-down menu page, find the "Charging Prompt Sound" option and turn off the switch button on the right.