The mobile phone, also known as cellular phone, has become one of the most successful inventions in the 20th century. In the late 90s, mobile phones became one of the major communication devices. The first commercial mobile phone system started in 1979 in Japan. According to Cellular Online, the global mobile phone subscribers in 2003 are around 1.52 billion, which is about 20 percent of the current world population. This figure showed the success of the mobile phone industries. In about 20 years’ time, this technology conquered the global and became a demand for the majority of people in the world. It provided communication for people no matter anywhere and anytime. Mobile phones were meant to be a device which enables users to have the ease on telecommunication freely wherever they want. But in the late 90s, SMS (Short Message Service), a new technology was brought out. SMS is a transmission of short text message from mobile phones to mobile phones. This became a revolution making mobile phones to develop into a device that not only allows simple voice to voice telecommunication. Mobile phone now not only became an entertainment device (featuring functions such as camera, FM and MP3 players etc) but also allowing users to access through internet, personal digital assistant (PDA) functions and also having video conference using the latest 3G network. Someday, mobile phones might be able to replace computers. From the early stages of analog cellular to now the latest 3G …

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