People talk loudly into cell phones, annoying others nearby, but the technology exists (has existed for a very long time!) so that they don't have to. Pick up quiet speech with a microphone placed close to the mouth, even in a loud environment.
People also l talk loud so they can hear themselves speak. This can be done in a loud environment by echoing what the microphone picks up through the earpiece.
Old landline phones did these just fine. Create a cell phone that does these. For nostalgic effect, or for highly practical reasons, one might reuse the form factor of old handset phones.
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