Mobile Phones

The mobile phone is an electronic wireless device to access and use network services or mobile cell phone. Cell is called in most Latin American countries because the service operates through a network of cells, where each relay antenna is a cell signal, although there are mobile phone networks
From century, mobile phones have acquired features that go far beyond merely just to call, translate or send text messages, it could be said to have unified (not replaced) with various devices such as PDA, camera photos, electronic calendar, alarm clock, calculator, micro projector, GPS or multimedia player and able to perform a multitude of actions in a small, portable device that takes virtually everyone in developed countries. This type of mobile phone evolution is called smartphone (or your controller).
The first automatic commercial network was NTT of Japan in 1974, followed by the NMT, operating simultaneously in Sweden, Denmark, Norway and Finland in 1981 using Mobira Ericsson phones (the ancestor of Nokia). Saudi Arabia also used the NMT and put into operation a month before the Nordic countries. The first record on the U.S. mobile phone company is Motorola, with its model DynaTAC 8000X. The model was designed by engineer Rudy Krolopp Motorola in 1983. The model weighed less than a kilo and had a value of nearly U.S. $ 4,000. Krolopp subsequently be incorporated to research and development team led by Motorola's Martin Cooper. Both Cooper and Krolopp appear as owners of the original patent. From DynaTAC 8000X, Motorola develop new models like the Motorola MicroTAC, released in 1989, and the Motorola StarTAC, launched in 1996 to market. Basically we can distinguish two types on the planet mobile networks, the existence of these is crucial for us to carry out our cell phone use, to sail on the internet or to send text messages as we usually do . The first network is the Mobile Network analog type (TMA), it establishes communication with analog voice signals, both in the radio section and in the land section, the first version of the same work in the radio band 450 MHz, then work on the 900 MHz band, in countries like Spain, this network was withdrawn on December 31, 2003. Then we have the digital mobile phone network, here and communication takes place via digital signals, this allows us to optimize the use of radio frequency bands as the quality of signal transmission. The most significant exponent that this network has currently the third generation GSM and UMTS, both operating in the bands of 850/900 MHz, in 2004, came to reach 100 million users. Martin Cooper was the pioneer in this technology, he is regarded as "the father of the cell phone" to enter the first radio in 1973, in the United States while working for Motorola, but it was not until 1979 when the first commercial systems in Tokyo, Japan by NTT.
In 1981, the Nordic countries introduced a cellular system like AMPS (Advanced Mobile Phone System). On the other hand, in the U.S., thanks to the regulator of the country adopted rules creating a commercial mobile service in 1983 was put into operation the first commercial system in the city of Chicago.
With that starting point, in several countries spread cellular telephony as an alternative to conventional wireless telephony. The technology was very popular, so a few years to establish itself began to saturate the service. In that sense, there was the need to develop and implement other forms of multiple access to the channel and transform the analog to digital, in order to make room for more users. To separate the other stage, cell phones have been characterized by different generations. The following describes each. Today are very important tactile phones