Introduction

Phones have gotten so complicated, so hard to use, that you wonder if this is designed for real people or for engineers

Martin Cooper, cell phone inventor.

The history of mobile phones charts the development of devices which connect wirelessly to the public switched telephone network. The transmission of speech by radio has a long and varied history going back to Reginald Fessenden’s invention and demonstration of radio telephony, through the Second World War with military use of radio telephony links. Early devices were bulky and consumed high power and the network supported only a few simultaneous conversations. Modern cellular networks allow automatic and pervasive use of mobile phones for voice and data communications.

In the United States, engineers from Bell Labs began working on a system to allow mobile users to place and receive telephone calls from automobiles, leading to the inauguration of mobile service on 17 June 1946 in St. Louis, Missouri. Shortly after, AT&T offered Mobile Telephone Service. A wide range of mobile telephone services offered limited coverage area and only a few available channels in urban areas. The introduction of cellular technology made widespread adoption of mobile telephones economically feasible.

The advances in mobile telephony can be traced in successive generations from the early “0G” services like MTS and its successor Improved Mobile Telephone Service, to first generation (1G) analog cellular network, second generation (2G) digital cellular networks, third generation (3G) broadband data services to the current state of the art, fourth generation (4G), IP networks.

Motorola was the first company to produce a handheld mobile phone. On 3 April 1973 Martin Cooper, a Motorola engineer and
executive, made the first mobile telephone call from handheld subscriber equipment in front of reporters, placing a call to Dr. Joel S.Engel of Bell Labs. 

Forty years later, a company named Apple sells 125 million phones around the world. This phone, that would have seem a mere imagination to our grandparents, not only allows to make calls or text. It allow us to do everything you could ever imagine with something as “simple” as a 4 inches touchscreen.

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