1in April, 973, marty cooper, a technician of the famous American Motorola Company, invented the world's first mobile phone that can be used by civilians.

When marty cooper invented the first mobile phone, it could make calls on any radio frequency band. In fact, the first generation of analog mobile phones used different frequencies to distinguish different mobile phones and different users.

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1975, the federal communications commission of the United States defined the spectrum of land mobile phone communication and large-capacity cellular mobile phone. It is ready for the commercial application of mobile phones.

1979, Japan opened the world's first cellular mobile phone network. 1982, GSM was established in Europe. 1985, the first commercially feasible mobile phone was born.

It puts the power supply and antenna in an example and weighs 3 kilograms. The modern mobile phone was born in 1987. Its weight is still about 750 grams, while today's mobile phone is only 60 grams, just like a big brick.

Since then, mobile phones have become thinner and thinner. 199 1, this phone weighs about 250g. 1in the autumn of 996, a small mobile phone with a volume of 100 cubic centimeter and a weight of 100 gram appeared.

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