Mobile Phone

Mobile phone (also known as hand phone, cellular phones, cordless phones) is an electronic device, a portable, short-range use as a tool for voice or data communication over a network of base stations known as the site of the cell. In addition to the standard voice function as telephones, cell phones are now capable of supporting many additional GSM service, and have an additional phone features, such as short message service SMS for text message, e-mail, packet converter for Internet access, gaming, Bluetooth, infrared , camera with video recorder and Multimedia Messaging Service ('' Multimedia Messaging Service - MMS'') for sending and receiving video. Most of the mobile phone will be connected to the cellular network base stations (cell sites''''), which is then connected to the public switched telephone network (public switched telephone network'' -'' PSTN) (the exception is satellite phones).

According to internal memos, American Telephone & Telegraph'' talk'' to develop a wireless phone in 1915, but concerned the implementation of the technology will undermine its monopoly on wired service in the United States. 

Commercial mobile phone service first launched in Japan by NTT in 1978. By November 2007, the number of mobile phone subscribers worldwide has mencecah.3 billion, or half of the human population (although some users have multiple subscription, or inactive subscriptions), which also makes mobile phones the most widely used technology and common electronic devices in the world. There is also a study on the acceptance of mobile phone services 

Marketed commercially since about 10 years ago, mobile phones experiencing rapid growth with over 15 million users in Malaysia in 2004, based on a survey conducted Communications and Multimedia Commission (MCMC). Out of the total 61.1 percent of mobile phone users are men, while 38.9 percent were female.

From there triggered a variety of forms ranging from mobile phone technology technology Global System Mobile Communications (GSM), complemented WAP / GPRS until there who can download music, connect to the Internet and record still pictures or visual. How good is that!

Alexander Graham Bell successfully invented the telephone in 1876 allowing people around the world in relation to each other though far apart.

Although, since his death in 1922, the telecommunications technology has dramatically changed and grown leaps and bounds, renewed by later generations of innovation to enable human beings on earth, even in relation to other human being on the moon without the help of cables.

In Malaysia analog wired telecommunication system (ETACS) was first introduced in 1989. Since its introduction, Malaysia between users based mobile system ETACS world's largest coverage area where more than 90 per cent of the occupation.

Telekom Malaysia (TM) to introduce mobile phone services PROGRAMS (Automatic Telephone Using Radio) 450 in May 1985, mobile phones have undergone a very rapid evolution, in terms of technology and design.

The first two digital system began operating in 1992, the GSM (Global System for Mobile Communications) in Europe and D-AMPS (Digital Advanced Mobile Phone Service) in North America.

A total of 9.5 billion SMS sent an average of RM5 billion mobile phone users in Malaysia during 2004. 3.4 billion were recorded until the first quarter of 2005. Latest telecommunications technology is the use of QR Code involving camera phone.

The first handset that allows an Internet connection and a wireless e-mail is the Nokia Communicator, released in 1996, thereby creating a new category of expensive phones called smartphones. In 1999 the first mobile internet service was launched by NTT DoCoMo in Japan under the i-Mode service. By 2007 more than 798 million people around the world access the Internet or the like to use mobile internet services such as WAP and i-Mode or at least use a cell phone instead of a computer.

Cellular system

Mobile Phone Towers

Mobile phones send and receive radio signals with several cell site base stations fitted with microwave radio. These sites are usually mounted on a tower, pole or building, located throughout populated areas, then connected to the system switches and wired communication networks. Phone has a low-power transmitter that transmits voice and data to the nearest cell sites, usually not more than 8 to 13 miles (about 5 to 8 miles) are close by.

When the mobile phone or data device is installed, it signed up with Mobile Exchange Center ('' Mobile Switching Center''), or switch, with its unique identity, and then it can be told by the switch can move when there is an incoming call. The handset constantly listening for the strongest signal received from the surrounding base stations, and be able to switch seamlessly between the transmitter site. When the user moves in the network, the transition is done to allow devices to switch sites without disrupting the call.

Usual low-powered cell sites (often only one or two radio transmitters watts) that radiate presence and convey relationships between sets of mobile phones and switches. Switches then connect the call to the wireless service provider customers or to the Public Telephone Network PSTN, including networks of other wireless providers. Most of this site disguised to unite with per round, especially in the countryside.

The third generation network (3G), which is being implemented, starting in Japan in 2001. It is fully digital and offers fast data access in addition to voice services and include W-CDMA (known as Universal Mobile Telecommunications System - UMTS), and CDMA2000 EV-DO. China launched the next generation of technology on the TD-SCDMA standard. Operators use a mixture of a predetermined frequency band by network and local regulatory requirements.

In an effort to limit the damage to a transmitter near the body of the user, the first cellular phone has a separate transmitter antenna on the vehicle, and a set of hands (known as a 'car phone' and 'bag phone') are limited to a maximum of 3 watts Effective Power Transmitter ('' Effective Radiated Power''). Modern cell phones have antenna which held a few inches from head capped at 0.6 watts ERP pemancer power. Whatever the potential biological effects, reduced transmission distance limit for modern mobile kegunaannyai rural than car phone / mobile bag, and mobile phones require more nearby cell towers installed to address the lack of transmitter power.

Some mobile phones including additional antenna port on the back of the phone, which allows an external antenna is connected to the large and 3 watt cellular amplifier. In addition the side reception area, a cellular repeater may be used, which uses high disk remote receiver antenna or Yagi antenna for connecting to cell towers above normal range, and the repeater to broadcast on short-haul small antenna that allows cell phone within a few meters to works well.

Set of Hand

Currently Nokia is the largest mobile phone manufacturer, to dominate the world market share of around 40 in 2008. Major handset manufacturers including Samsung (14) Sony Ericsson (14) Sony Ericsson (9) and LG (7). [5] These manufacturers account for over 80 of all mobile phones sold and produce phones for sale in most states.