The concept of mobile phones appeared in 40s. At that time the United States the largest telecommunications company - Baer laboratory has conducted research. In 1946, the Baer lab made the first mobile phone in human history. But because it is too large, the researchers can only put it on the shelf in the laboratory, and it has been
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1973 mobile phone has been registered patents, but until 1985 was born in the first modern mobile phone. It is the power and antenna placed in a box, the weight of 3 kg, very heavy and inconvenient, the user should carry it like a backpack to carry it to walk, so it is called the shoulder back phone".
