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> As an example, I never see Japanese people on their speakerphones in public. Some other cultures seem more likely to view it as acceptable.

Demographics is everything. Import speakerphone users, get speakerphone usage.

Some cultural groups also seem more likely to make video calls, where they are walking and talking to someone on their phone screen.

Still not a reason not to use headphones as all but the cheapest come with a built-in microphone.