Mobile Phone Technology - The Development

Mobile Phone Technology - The Development
Mobile phone is a small, portable communication device that enables people to make phone calls whenever where they are. It receives and gives out signals via the service providers’ transmitting towers and even via satellite. The convenience of mobile phone is allowing people to communicate with one another without the limitation of regions and time.
Mobile phone is a device providing two-way communication. Signal transmission is the very basic concept for mobile phone. It uses the radio wave theories which are similar to the ordinary radios. The frequencies of mobile phones of course are stronger and higher than ordinary radios to enable clearer conversation among users. The transmission of the mobile phones allow these radio wave (signals) to “interact� (to receive and send) from the device to the transmission centers (towers), then to another user (no matter land line or another mobile phone). The signals of mobile phone are split into small cells (This is also why mobile phones are also known as “Cell Phones� earlier) geographically. These cells allow radio transmission enabling authorised signals to receive and send out among the mobile phones.
The technology influencing on mobile phone started back in the mid twentieth century. The very first mobile telephony service was in Sweden. It was a form of radio telephony tested by the Swedish police for used in police cruisers. This form of radio telephone is a two-way radio which is still widely used in taxis and police cruisers. In 1946, America’s AT&T and Southwestern Bell brought out the first commercial mobile telephone service in 1946. This service is used on communication devices which are permanently installed on vehicles. It uses a weaker signal (compared to what mobile phones receive now), but a similar theory of receiving and giving out signals. Though, the bandwidth is very low.
The “modern� mobile phones are developed, researched and experimented in the 1970s. AT&T’s Bell Lab and Motorola from United States are the pioneers in that time. Mobile phone was patented individually by Motorola in 1975. Though, the first commercial mobile phone system (also known as network system or system operator) was launched in Japan in 1979. The second mobile phone system was established in 1981 later in United States. In the late 1980s, along with the commercialised mobile phone system, the mobile phone industry started to develop rapidly and attracting more users to use mobile phones.
In 1990s, along with the popularity on a new network system GSM (Global System for Mobile Communication), more and more people started to subscribe for mobile phones. In 2003, there are about 1.52 billion mobile phone users around the world, making it a big and important industry in the technology field