I get that. I've had 2 since apple replaced one and have same issues. No phones regardless of manufacturer are identical which is why not everyone has same issues. I think this falls under how apple programmed their phone to handle 4G and 5G same the carrier doesn't work with it. Just a guess.My apologies that you assumed just because I’m not having problems that nobody else should be having problems either.
However, I am inclined to believe that not all iPhones are built identically either.