The first call from a mobile phone was placed on April 3, 1973 by Martin Cooper, the director of research at Motorola.
The first mobile phones weighed close to a kilogram and cost $4,000.
Nowadays cell phones are a lot cheaper and are used by millions of people around the world.
Who did Cooper call? Joel Engel, who worked at Bell Labs, a competitor of Motorola.
WORDS
research: scientific study.
research in other languages
competitor: a rival.
competitor in other languages
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