Taking Huawei Glory 20 mobile phone as an example, the specific operation steps are as follows:

1. Turn on the power of the mobile phone, select Settings on the main page of the mobile phone, and click Enter, as shown in the figure below;

2. Select a voice on the current page and click Enter, as shown in the figure below;

3. Select "Call Ring" and click Enter, as shown in the figure below;

4. Select the default ringtone of the current page, which is the original ringtone of the mobile phone. Click Select to complete the operation.