I read that by 1880, there were 48.000 telephones in USA. Did you read about it?

Modern telephone was invented in 1876. There were simpler telephones made before 1876 but they were simple and not usefel.

In modern sense, actual telephone was invented in 1876 by a scottish person.

What is interesting, by 1880, there were 48.000 telephones in USA.

How did this happen in just 4 years?

I read that by 1880, there were 48.000 telephones in USA. Did you read about it?
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