https://support.apple.com/en-us/HT203792
https://support.apple.com/en-us/HT203800
Although, if you're having problems with the microphone and receiver, it's probably time to consider a new phone...
https://support.apple.com/en-us/HT203792
https://support.apple.com/en-us/HT203800
Although, if you're having problems with the microphone and receiver, it's probably time to consider a new phone...
https://support.apple.com/en-us/HT203792
https://support.apple.com/en-us/HT203800
Although, if you're having problems with the microphone and receiver, it's probably time to consider a new phone...
Have you tried rebooting your iPhone?
I can’t hear from clearly from my iphone