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Transcript of Mobile phones
A mobile phone is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area. The radio frequency link establishes a connection to the switching systems of a mobile phone operator, which provides access to the public switched telephone network (PSTN).
The very first mobile phone
On April 3, 1973, Martin Cooper, a Motorola researcher and executive, made the first mobile telephone call from handheld subscriber equipment, placing a call to Dr. Joel S. Engel of Bell Labs his rival. The prototype handheld phone used by Dr. Cooper weighed 1.1 kg and measured 23 cm long, 13 cm deep and 4.45 cm wide.
Evolution of the cell phone
In 1983, the DynaTAC 8000x was the first commercially available handheld mobile phone. From 1983 to 2014, worldwide mobile phone subscriptions grew to over seven billion, penetrating 100% of the global population and reaching even the bottom of the economic pyramid. In first quarter of 2016, the top smartphone manufacturers were Samsung, Apple, and Huawei (and "[s]martphone sales represented 78 percent of total mobile phone sales").
Technology has captured an evolucion in the past years, and of course one of them are the advanced smartphones. Well, smartphones ! We all know what they are and how to use them. We know what they look like? Do we really know them properly? Are we using them right? What do you think? Smartphones are a mistery that can be reviled day by day. We never know what will come next if that so! they really changed the human being's life for reals when no one belived that would happen. But they have disadvantages about our health, life and world.
The first smartphone
Evolution of mobile phone
A refined version was marketed to consumers in 1994 by BellSouth under the name Simon Personal Communicator. The Simon was the first commercially available device that could be properly referred to as a "smartphone", although it was not called that in 1994.
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