No sound can be heard when making calls on Xiaomi mobile phone, but it works normally after removing the back cover

Hi! ① Please adjust the volume in the system settings - sound and vibration. Secondly, during the call, please pay attention not to block the bottom of the phone and the mic near the flash on the back. If you still have problems, you can backup the line and flash your phone. system version, or go to Xiaomi's repair point for after-sales inspection ② Because Xiaomi mobile phones have a unique noise reduction mode

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