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Is it illegal to use your phone when parked in a car?
And on the hands free - their current car definitely would have come with it. Idk about their old Mazda 3, 50/50 is my guess. Plus phones have speakers.
It's just easier to tap a horn than have the inconvenience of a brief wait or to dial a number. And they haven't considered that hooting outside one house is actually hooting outside 14 other people's homes who may not like it.
Because they don't have a handsfree thing and don't want to break the law?
Not that most uses of car horns are lawful anyway.