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Mobile telephone is the most widespread modern invention amid human across the world. But only several users may answer who created the earliest cell phone, or which firm did it. There were made a plenty of communication devices in the twentieth that are targeted to simplify our life and general of them is cellular telephone. The first firm which offers to invent a mobile telephone was AT&T (the firm that also suggests calling cards), or rather Bell Laboratories. In 1947 the proposal of creating of cell phone was really audacious, that's why inventors resolved to set chief types of such telephones in an automobile. We can comprehend them, because it was impracticable to imagine that someone will be able to bear a 30-40-kg phone even without a power supply!. The developers tried to find the solution of the problem of great mass of phones in 1950-s. There was progress in decision of the difficulty of phones' weight, in 1970-s the weight of an automobile telephones was reduced 12-14 kg, but they were still powered by embedded network of a car. The working out of cellular telephones did not consider by Motorola during those years, they were well-known for portable radio transmitters. In 1954 Martin Cooper, a new inventor of Motorola, started a modern period of portable cell telephones. He was an average working man and was engaged in the inventation of new handheld apparatuses. In 1967 Chicago police became their main customer who ordered portable radio. Almost after 20 years of his career at Motorola, M. Cooper comprehended that he might create a relatively small mobile phone. It took them one year to make sketches of the first mobile phone. Private corporations had to introduce to people new cordless solution of communication, that is why Motorola pressed Federal Communications Commission (FCC) for free frequencies. The proposition of frequencies appointment was come across with skepticism, because the specialists of Bell Laboratories (one of the widest and best-known laboratories in the world) brought into issue the opportunity of creation really little devices in the coming years. Nevertheless, a advantageous resolution was accepted: Motorola was to prove the possibility of invention such nets. At that time they couldn't guess that today we would have phone cards utilized online international calling card. They quickly began to get ready for the first examination program of April 3rd, 1973. On April third, 1973 first transponder was put onto the upper level of Alliance Capital Building in New York City. The earliest model of transponder could connect thirty consumers at most with land lines. They named it Dyna-Tac, it had 12 knobs and its weigh was 1.5 kg. It has no monitor or any extra features. The accumulator is permitted to talk thirty-five min, but it should have been charged more than 10 hours. In the morning of April, 3rd Cooper utilized the new portable cell device to call the head of the research department of the Bell Laboratories Joel Engel. Of course, it was a victory of Cooper and the company Motorola at all. After some time the developers realized that they created a overturn in the sphere of telecommunications. in our times thankfully to them we may apply cellular telephones and calling cards as well.
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