Mobile phone is a kind of portable telephone terminal which can be widely used. It is called a mobile phone or a wireless phone. At first, it was just a communication tool. It was commonly known as "mobile phone" in China in the early days.

The mobile phone was first developed from the battlefield mobile phone manufactured by Bell Laboratories in 1940, and the first commercial mobile phone in the world was invented by Motorola engineer marty cooper in 1973. In addition to typical telephone functions, modern mobile phones also include many functions, such as camera, GPS and Internet connection, which are often called smart phones.

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1985, the first commercial 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, which is like a big brick compared with today's mobile phone with only 60 grams. Since then, the "slimming" of mobile phones has become more and more rapid. 199 1 year, and the weight of the mobile phone is about 250g. 1in the autumn of 996, a mobile phone with a volume of 100 cubic centimeter and a weight of 100 gram appeared. Since then, it has been further miniaturized and lightweight, and 1999 has been lighter than 60 grams.

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