Mobile phone appears sound silent, sound too small and call intermittent in calling mode

Solutions:
1. Due to usage problems, when holding the phone in right hand, the little finger of right hand will block the microphone feed hole at the lower end of the phone (the hole to the left of the USB charging interface), resulting in no sound of the microphone when sending the sound to phone; move the little finger of right hand to return to normal.
2. Check whether there is any foreign body blocking in the main microphone. If there is, it is advised to clean at the after-sales outlets instead of cleaning it by one's own.
3. Ask whether the third-party calling application or recording software has been installed or not, and try after uninstalling it.
4. It is recommended to try after updating to the latest system version.
5. Try to talk with others while ensuring the normal signal of mobile phone. If the signal is normal, it may be because the receiver of the other party's mobile phone is out of order.
6. If talking with other people, they can't hear voice, and the signal is normal, open the "record" system software, and see if there is something wrong, if the normal main mic hardware has no problem, if it is unable to record, doubt main mic failure, it is suggested to go to Xiaomi authorized after-sales center for inspection.