Who invented the mobile phone

The world’s first mobile phone was born in 1985. At that time, there was no such term as “mobile phone”. Because this kind of phone had to walk like a backpack, it was called shoulder phone. < p > < p > one day in April 1973, 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 watch. This is Martin Cooper, the inventor of the mobile phone. At that time, Cooper was an engineer at Motorola. < / P > < p > while working at Motorola, Cooper always had a dream that he wanted the media to know that wireless communication, especially small mobile phones, is very valuable. In addition, he hopes to arouse the interest of the Federal Communications Commission and support Motorola in the competition with at & T. < / P > < p > in fact, the concept of mobile phone appeared as early as 1940s. At that time, Bell Labs, the largest communication company in the United States, took the lead in the research and trial production of mobile phones. In 1946, Bell Labs produced the first so-called mobile phone. However, due to its huge size, researchers can only put it on the shelf of the laboratory, and gradually people forget it. < / P > < p > it was not until the late 1960s that at & T and Motorola began to take an interest in this technology. At & T was renting a bulky mobile wireless phone with 10 watts of power that customers could install on a large truck. Cooper thinks that this kind of telephone is too big and heavy, and it’s very inconvenient to carry. It can’t be carried at all. As a result, Motorola applied to the Federal Communications Commission of the United States to limit the power of mobile communication devices to 1-3 watts. < / P > < p > it was not until 1985 that the first mobile phone in modern sense was born. This kind of telephone put the power supply and antenna in a box, weighing up to 3 kg. The user had to carry it like a backpack, so it was called “shoulder phone” at that time. < / P > < p > statement: I share this tutorial in the hope that you will understand information security and be alert through this tutorial! This course is only for teaching use, can not be used for other purposes, violate the law, I am not responsible, please know! Continue ReadingStraight screen S20! Samsung Galaxy S20 Fe exposure: 1Hz high brush + snapdragon 865