Obviously, this is a long term issue with no proven solution. I have Moto X Play (same as Droid Maxx turbo 2) and recently discovered no one can hear when I make phone calls except when using loudspeaker. Believe me: No dropping and no water is involved here; it's just that everything was fine about one month ago until I downloaded "Sound Check" app. It worked fine when I used it a couple of times, but since I'm not a heavy caller, I didn't noticed my microphone was not working properly until recent date. Something happened inside the curse of that month and it's probably related to that app. Probably. Deleting it didn't work, BTW. Whatever, I'm in strong doubt about the microphone being actually damaged (unless Moto X Play has two mics, which as far as I know is not the case) since videos made with camera app are recorded with sound. However, Google TTS is useless and sound test apps don't register ambience sound, though a noticeable "hiss" sound is perceptible when playback. I use earphones very often for music and I already had suspicion about the earphones socket being related with the issue, as someone suggested above... 5 years ago! I haven't checked for it yet, but I'll do and see what happens... Though, I don't think it's a dirt related problem indeed
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