1. The Mobile PhoneWork by:Inês Mota, nº 14Paula Leal, nº 2010º1B<br />Definition<br />The phone is a communication device via electromagnetic waves that allows two-way transmission of voice and data usable in a geographical area, one served by a transmitter / receiver. <br />History <br />2. Motorola DynaTAC 8000XEricsson MTAHeinrich Hertz in 1858, pioneered the transmission of codes through the air. The discovery became the infallible idealization of radio transmitters. Furthermore, it provided the first telephone connection between continents, which occurred in 1914. Mobile communication was known from the beginning of the twentieth century. Originally developed by Hollywood actress Hedwig Kiesler and patented in 1940, the phone appears as a system of communication which always change the channel to which the frequencies were not intercepted. In 1947, began development in the Bell Laboratory, in USA. In the laboratory Bell, has developed a phone system, high-capacity connected by several antennas, with each dish, was considered a cell. Hence the name quot;
mobilequot;
. The first cell was developed by Ericsson in 1956, called Ericsson MTA (Telephony Mobilie A), weighed about 40 pounds and is designed to be installed in the trunk of cars. The U.S. company Motorola started to develop its model of phone and on April 3, 1973, in New York, unveiled the Motorola DynaTAC 8000X. Using this model was the historic first call from a mobile device, made by Martin Cooper, director of systems operations of the company Motorola. The device, very common, was 25 cm long and 7 cm wide, and weigh about 1 pound. In 1989, there were 4 million mobile subscribers around the world. In 2009 are 4600 million on the way to 6000 million anticipated for 2013.A International Telecommunication Union considers that quot;
The mobile technology was quickly adopted as usual.quot;
<br />Appearing in Portugal<br />In 1989 it launched the mobile service in Portugal, the company CTT and TLP, later known as TMN. In 1992 came the Telecel (later acquired by Vodafone) and in 1998, Optimus. Generations phone The industry classifies mobile telephone systems in generations: the first generation (1G) analogue, the second generation (2G) digital, the second and half generation (2.5G) with significant improvements in capacity and data transmission the adoption of technology packages and no more switching circuits, the third generation (3G). And since developing a 4G (fourth generation). <br /> Popularity of mobile phones<br />3. Percentage of use of mobile phones around the world (2004 data)<br />In Portugal <br />In Portugal, the penetration rate of mobile phones has already exceeded 100%, then we conclude that there are more equipment Portuguese inhabitants. Due to these figures, the operators try to keep your customers through new services, especially data communications, especially for mobile Internet access via third-generation technologies. <br />Its usefulness <br />The cellular / mobile phone when released later in analog technology was only used to talk, now is used to send SMS, take pictures, film, Up, memos, play and listen to music. In recent years, especially in Japan and Europe has gained surprising features not previously available for mobile devices such as GPS, video conferencing and installing programs varied, ranging from reading the e-book using any computer remotely, when properly configured. <br />Personalization Along with digital technology, came in addition to quality and safety, the ability to customize cell phones / mobile phones. Initially you could set the tone monophonic, which are formed only by the same beep tone, configured to have the music, as well as the monochrome figures that are almost unknown. With the new generation of devices, mainly in the release of the GSM system, then came in addition to polyphonic ringtones and MP3 format with color images. The color pictures can be of two distinct types: • GIF format, be it a format that only supports 256 colors, the devices pioneers, was usually used that format. • JPG format, widely-spread thanks to this digital camera supports up to 64 million colors and is used in more advanced devices, and virtually all digital cameras that are integrated into the phone.<br />