I got my s9+ as a pre-order, so I've had it since they were released. My call volume just started being extremely low yesterday after being fine for months. It's not the screen protector, and I haven't installed any new apps or updates or changed any settings. It works fine on speakerphone and with headphones. No phone drops or liquid damage either. I'm on the Galaxy S9+, US version through T-Mobile, model SM-G965U. WTH is going on!
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