Chosen Solution

Hello all, does anyone know which microphone the iPhone 6 uses while the phone is on speaker? My phone works fine but when I switch to speaker phone the other end can not hear me at all. I already replaced the microphone thats attached to the front camera and it still doesn’t work. Any input is greatly appreciated.

I think its the microphone located near the ear piece speaker, it would be a cheap and easy fix. https://support.apple.com/en-gb/HT203792