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Why are telephones a great impact today? Telephones are another use of simultaneous transmission and reception of the human voice. Also why are telephones a great impact today? The reason telephone are an huge impact for other people, since it inspires other people to do better in what they can do. Another reason is telephones helped people interact from different regions, and countries all around the world for centuries. The third reason is, telephones a great use for emergencies, an example is, how would the police know that you/ someone else were in trouble?This is why telephones helped the modern day for useful things and this is why huge impact on humanity.