Got the same issue on Pixel 4a 5g. I got my phone 10 days ago, initially seemed fine, now can’t hear anything when I make a call, and no one can hear me. Tried turning off wireless calling, no benefit - but I am also noticing that my 5g signal is at zero or just above, and often it says LTE instead of 5g. I just called the cell phone from a land line, didn’t ring, went straight to message, then after I leave a message I get a pop-up message. So phone function is reduced to that of an answering machine.
Resetting all network settings seems to have restored it for me. that is under the “Reset wi-fi, mobile, and bluetooth” option. Hopefully it will last!
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