Can anyone help me with a really strange issue? Using the phone app, if I take or make a call and use the earpiece my voice is really, really quiet. Switch to hands free and all is well. whatsApp calls seem to work well too. calls on Airpods Pro work fine too. I have tried resetting network settings, resetting all settings, erasing and restoring from iCloud backup - none of it does any good. I've tested the bottom mic by making a recording or two and that seems to be fine. I'm now clean out of ideas. Using an SE2020 and IOS15.2 and this problem only seems to have come about in the last two or three days. Can anyone help please?