The cell phone or mobile phone refers to the portable electronic device that works on a short range and finds application in mobile voice or data communication. It carries the voice via a network of base stations that are in the specialized form and are called as cell sites.
As per the records of November 2007, the total amount of subscriptions for cell phones went upto 3.3 billion, which puts this technology as the most popular and important gadget in all parts of the world. The modern cell phones not only serves the voice function of a telephone but also provide for plenty of additional services as well as accessories like email, SMS for text messaging, bluetooth, infrared and video recorder.
A large number of cell phones get connected to a cellular network of base stations and this further provides inter-connection to the Public Switched Telephone Network (PSTN). The cell phones are capable of sending as well as receiving signals via quite a number of cell site base stations that carry fittings with microwave antennas. The mounting of these sites are mostly done on a pole, tower or building that is situated in the areas having large population. It is then provided connection with communication network as well as switching system.
The cell-sites includes low-power radio transmitters and they turn up with the broadcasting of their presence and carry out communications between the mobile handsets and the switch. The switch provides connection of the call to another subscriber belonging to the same wireless service provider or to the telephone network running publicly. The dialogue that goes on between the cell phones handset and the cell site is basically a stream of digital data, which is comprised of digitized audio.
In recent times Nokia is regarded as the biggest manufacturer of mobile phones in the world and tends to possess device market share on global level of nearly 40 percent in the year 2008. The other important manufacturers of cell phones are Motorola (14%), LG (7%), Samsung (14%) and Sony Ericsson (9%). The year 2000 marks the launching of the initial mobile news service, the delivery of which is made through SMS.
Cell phone
