1, it may be that the mobile phone speaker has noise due to long-term high-volume music;

2. It may also be caused by the low sound quality of ringtones and music;

3. There are some problems with the mobile phone microphone itself. It is recommended to check after sale.

Solution:

1, turn down the volume in the settings;

2. Check whether there is dust in the microphone of the mobile phone;

3. Download music with higher definition.