As an update to my previous post (turning off 5 G to make a SLIGHT improvement)….
I had complained about this new phone to Verizon and it was within the initial 30 days. They offered to send a new phone. I waited, preferring to try some other fixes to see if anything improved. I was also skeptical it would make any difference, as so many users here reported the same issues on a replacement phone.
Then a friend of mine got a new iPhone 13 Pro Max, same model as mine. He primarily uses the speakerphone for work, as do I. His new phone didn’t have the problem.
I then went back to Verizon under my original ticket and they sent me a new phone. This new phone doesn’t have the problem. That was evident from the first call.
I have saved my identifying numbers from the first phone…..perhaps there was a large batch that had this issue, and the newer batches don’t. I don’t know if there is any way for us afflicted users to compare our serial numbers on the problem phones…..
I am almost certain that the radio antennas are/were bad.