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What is the reason for the noise of the mobile phone's microphone?

Time：

2022-05-26

1. Please adjust the call volume to the maximum During a call, press the volume up key to increase the call volume.

1. Please adjust the call volume to the maximum
During a call, press the volume up key to increase the call volume.
2. Confirm whether the Bluetooth device is connected
If the phone is connected to a bluetooth device, the sound can be broadcast from the bluetooth device, such as: bluetooth headset, car bluetooth, etc., you can enter the settings - other networks and connections, turn off the bluetooth function to view.
3. Make sure that the sound holes of the earpiece, microphone, and speaker are not blocked or blocked (models that use the screen to sound do not need to check the sound hole of the earpiece)