When I talk to people on my iPhone 6 they can’t hear me, but if I select speaker mode I can be heard. It stops working when I put the iPhone next to my ear and then it switches back to microphone. I have had the screen replaced but no other works.
The microphone, which is used during a phone call, is situated at the bottom of the iPhone. When the iPhone is put into speaker mode it automatically changes to the microphone at your ear speaker. It maybe the case that some dirt is jammed in the holes at the bottom of your iPhone. You can do that carefully remove dirt with the tip of the SIM pin or maybe some canned air.
If that isn’t successful, try a Settings ‘Reset’.
- Reset All Settings
Alternatively, the screen may not have been properly aligned when you had your screen replacement. If you can be heard very faintly on a call, the microphone has probably been dislodged.