1one day in April, 973, a man stood on the street of new york, took out a wireless phone about the size of two bricks and made a call, which attracted passers-by to stop and stare. This man is marty cooper, the inventor of mobile phone. At that time, Cooper was an engineer of the famous Motorola company in the United States. The first mobile phone in the world was called to an opponent who worked in Bell Laboratories. Marty cooper is 74 years old. After working in Motorola for 29 years, he founded his own communication technology research company in Silicon Valley. He is currently the chairman and CEO of this company. Marty cooper's idea at that time was to let the media know that wireless communication, especially small mobile phones, was very valuable. In addition, he also hopes to arouse the interest of the Federal Communications Commission, and AT & amp； t(AT & amp； T is also a big communication company in the United States) and can support the former. In fact, going back, we will find that the concept of mobile phone appeared as early as 1940s. At that time, the trial production was started by Bell Laboratories, the largest communication company in the United States. 1946, Bell Laboratories manufactured the first so-called mobile phone. But because of its large size, researchers can only put it on the shelf in the laboratory, and people will gradually forget it. Until the end of 1960s, in&; Two companies, T and Motorola, became interested in this technology. At that time, at & amp； T Rent a large mobile radiotelephone, which customers can install on the truck. At&T Company. T's vision is to develop a mobile phone with the power of 10 watt in the future, and use the radio equipment on the truck to communicate. Cooper thinks this kind of mobile phone is too big and heavy to move and carry. Therefore, Motorola filed an application with the Federal Communications Commission, requesting that the power of mobile communication equipment can only be one watt, and the maximum power cannot exceed three watts. In fact, the maximum radio power of most mobile phones today is only 500 MW. From 1973 to 1985, the first modern mobile phone was born. It puts the power supply and antenna in a box, weighing 3 kilograms, which is very heavy and inconvenient. Users must carry it like a backpack, so it is called a "shoulder phone".