A mobile phone (also called mobile, cellphone or handphone)[1] is an electronic device Electronics is that branch of science and technology which makes use of the controlled motion of electrons through different media and vacuum. The ability to control electron flow is usually applied to information handling or device control. Electronics is distinct from electrical science and technology, which deals with the generation, used for mobile telecommunications Mobile telephony is the provision of telephone services to phones which may move around freely rather than stay fixed in one location. Mobile phones connect to a terrestrial cellular network of base stations , whereas satellite phones connect to orbiting satellites. Both networks are interconnected to the public switched telephone network (PSTN) over a cellular network A cellular network is a radio network made up of a number of cells, each served by at least one fixed-location transceiver known as a cell site or base station. When joined together these cells provide radio coverage over a wide geographic area. This enables a large number of portable transceivers to communicate with each other and with fixed of base stations The term base station can be used in the context of land surveying and wireless communications known as cell sites A cell site is a term used to describe a site where antennas and electronic communications equipment are placed on a radio mast or tower to create a cell in a cellular network. A cell site is composed of a tower or other elevated structure for mounting antennas, and one or more sets of transmitter/receivers transceivers, digital signal processors,. Mobile phones differ from cordless telephones A cordless telephone or portable telephone is a telephone with a wireless handset that communicates via radio waves with a base station connected to a fixed telephone line, usually within a limited range of its base station . The base station is on the subscriber premises, and attaches to the telephone network the same way a corded telephone does, which only offer telephone service within limited range through a single base station attached to a fixed line, for example within a home or an office. Low-end mobile phones are often referred to as feature phones, whereas high-end mobile phones that offer more advanced computing ability are referred to as smartphones A smartphone is a mobile phone that offers more advanced computing ability and connectivity than a contemporary basic 'feature phone'. Smartphones and feature phones may be thought of as handheld computers integrated within a mobile telephone, but while most feature phones are able to run applications based on platforms such as Java ME or BREW, a.
A mobile phone allows its user to make and receive telephone calls A telephone call is a connection over a telephone network between the calling party and the called party to and from the public telephone network The public switched telephone network also referred to as the Plain Old Telephone Service (POTS) is the network of the world's public circuit-switched telephone networks. It is a worldwide net of telephone lines, fiberoptic cables, microwave transmission links, cellular networks, communications satellites, and undersea telephone cables connected which includes other mobiles and fixed line phones across the world. It does this by connecting to a cellular network A cellular network is a radio network made up of a number of cells, each served by at least one fixed-location transceiver known as a cell site or base station. When joined together these cells provide radio coverage over a wide geographic area. This enables a large number of portable transceivers to communicate with each other and with fixed owned by a mobile network operator A mobile network operator , also known as mobile phone operator (or simply mobile operator or mobo ), carrier service provider (CSP), wireless service provider, wireless carrier, or cellular company, is a telephone company that provides services for mobile phone subscribers. A key feature of the cellular network is that it enables seamless telephone calls even when the user is moving around wide areas via a process known as handoff In cellular telecommunications, the term handover or handoff refers to the process of transferring an ongoing call or data session from one channel connected to the core network to another. In satellite communications it is the process of transferring satellite control responsibility from one earth station to another without loss or interruption or handover.
In addition to being a telephone The telephone , often colloquially referred to as a phone, is a telecommunications device that transmits and receives sound, most commonly the human voice. Telephones are a point-to-point communication system whose most basic function is to allow two people separated by large distances to talk to one another. It is one of the most common household, modern mobile phones also support many additional services GSM services are a standard collection of applications and features available to mobile phone subscribers all over the world. The GSM standards are defined by the 3GPP collaboration and implemented in hardware and software by equipment manufacturers and mobile phone operators. The common standard makes it possible to use the same phones with, and accessories The typical cell phone has become somewhat obsolete; current cell phones offer embedded features such as memory databases for storing frequently called numbers, locking features for theft deterrence, crystallized displays, internet connection capabilities, and other useful features. With the addition of popular culture, science, and marketing the, such as SMS Short Message Service is a communication service component of the GSM mobile communication system, using standardized communications protocols that allow the exchange of short text messages between mobile phone devices. SMS text messaging is the most widely used data application in the world, with 2.4 billion active users, or 74% of all mobile (or text Text messaging refers to the exchange of brief written messages between mobile and portable devices over cellular networks. While the original term was derived from referring to messages sent using the Short Message Service (SMS), it has since been extended to include messages containing image, video, and sound content (known as MMS messages). The) messages, email Electronic mail, commonly called email or e-mail, is a method of exchanging digital messages across the Internet or other computer networks. Originally, email was transmitted directly from one user to another computer. This required both computers to be online at the same time, a la instant messenger. Today's email systems are based on a store-and-, Internet The Internet is a global system of interconnected computer networks that use the standard Internet Protocol Suite to serve billions of users worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks of local to global scope that are linked by a broad array of electronic and access, gaming, Bluetooth Bluetooth is an open wireless technology standard for exchanging data over short distances from fixed and mobile devices, creating personal area networks (PANs) with high levels of security. Created by telecoms vendor Ericsson in 1994, it was originally conceived as a wireless alternative to RS-232 data cables. It can connect several devices,, infrared Infrared light is electromagnetic radiation with a wavelength between 0.7 and 300 micrometres, which equates to a frequency range between approximately 1 and 430 THz, camera A camera is a device that records/stores images. These images may be still photographs or moving images such as videos or movies. The term camera comes from the camera obscura , an early mechanism for projecting images. The modern camera evolved from the camera obscura, MMS Multimedia Messaging Service, or MMS, is a standard way to send messages that include multimedia content to and from mobile phones. It extends the core SMS capability which only allowed exchange of text messages up to 160 characters in length messaging, MP3 player A digital audio player, shortened to DAP, usually referred to as an MP3 player, is a consumer electronic device that has the primary function of storing, organizing and playing audio files, in contrast to physical medium audio players, which play music from a physical medium on which the audio files are mechanically or electronically printed, radio Radio is the transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. Information is carried by systematically changing some property of the radiated waves, such as and GPS The Global Positioning System is a space-based global navigation satellite system that provides reliable location and time information in all weather and at all times and anywhere on or near the Earth when and where there is an unobstructed line of sight to four or more GPS satellites. It is maintained by the United States government and is freely.
The first hand held phone was demonstrated by Martin Cooper Martin Marty Cooper was the lead engineer of the Motorola team that developed the mobile phone (as distinct from the car phone). Cooper is the CEO and founder of ArrayComm, a company that works on researching smart antenna technology and improving wireless networks, and was the corporate director of Research and Development for Motorola of Motorola Motorola, Inc. is an American, multinational, telecommunications company based in Schaumburg, Illinois. It is a manufacturer of wireless telephone handsets, and also designs and sells wireless network infrastructure equipment such as cellular transmission base stations and signal amplifiers. Motorola's home and broadcast network products include in 1973, using a handset weighing in at two kilos.[2] By the end of 2009, the number of mobile cellular subscriptions worldwide reached approximately 4.6 billion, penetrating the developing economies Information and Communication Technologies for Development is a general term referring to the application of Information and Communication Technologies (ICTs) within the field of socioeconomic development or international development. ICT4D concerns itself with directly applying information technology approaches to poverty reduction. ICTs can be and reaching the bottom of the economic pyramid In economics, the bottom of the pyramid is the largest, but poorest socio-economic group. In global terms, this is the 2.5 billion people who live on less than $2.50 per day. The phrase “bottom of the pyramid” is used in particular by people developing new models of doing business that deliberately target that demographic, often using new.[3]
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History
Mobile car phone, 1964 Main article: History of mobile phones The history of mobile phones begins with early efforts to develop radio telephone technology and from two-way radios in vehicles and continues through to emergence of the modern mobile phone and its associated servicesRadiophones A radiotelephone is a communications device that allows two or more people to talk using radio. However, there is controversy about the definition of the term. There are also conflicts between British English usage, American English usage, and historic use have a long and varied history going back to Reginald Fessenden Reginald Aubrey Fessenden was a Canadian inventor who performed pioneering experiments in radio, including early—possibly the first— transmissions of voice and music. In his later career he received hundreds of patents for devices in fields such as high-powered transmitting, sonar, and television's invention and shore-to-ship demonstration of radio telephony, through the Second World War Albania · Australia · Austria · Azerbaijan · Belarus · Belgium · Brazil · Bulgaria · Burma · Cambodia · Canada · Ceylon (Sri Lanka) · Channel Islands · China · Czechoslovakia · Denmark · Dutch East Indies · Egypt · Estonia · Finland · France · Germany · Gibraltar · Greece · Greenland · Hong Kong · Hungary · Iceland · with military use of radio telephony links and civil services in the 1950s, while hand-held mobile radio devices have been available since 1973.
In 1960, the world’s first partly automatic car phone system, Mobile System A (MTA), was launched in Sweden. MTA phones were consisted of vacuum tubes In electronics, a vacuum tube, electron tube , or thermionic valve (elsewhere, especially in Britain) is a device used to amplify, switch, otherwise modify, or create an electrical signal by controlling the movement of electrons in a low-pressure space. Some special function vacuum tubes are filled with low-pressure gas: these are so-called soft and relays A relay is an electrically operated switch. Many relays use an electromagnet to operate a switching mechanism mechanically, but other operating principles are also used. Relays are used where it is necessary to control a circuit by a low-power signal , or where several circuits must be controlled by one signal. The first relays were used in long, and had a weight of 40 kg. In 1962, a more modern version called Mobile System B (MTB) was launched, which was a push-button telephone, and which used transistors A transistor is a semiconductor device used to amplify and switch electronic signals. It is made of a solid piece of semiconductor material, with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor's terminals changes the current flowing through another pair of terminals in order to enhance the telephone’s calling capacity and improve its operational reliability. In 1971 the MTD version was launched, opening for several different brands of equipment and gaining commercial success.[4][5]
Martin Cooper Martin Marty Cooper was the lead engineer of the Motorola team that developed the mobile phone (as distinct from the car phone). Cooper is the CEO and founder of ArrayComm, a company that works on researching smart antenna technology and improving wireless networks, and was the corporate director of Research and Development for Motorola, a Motorola Motorola, Inc. is an American, multinational, telecommunications company based in Schaumburg, Illinois. It is a manufacturer of wireless telephone handsets, and also designs and sells wireless network infrastructure equipment such as cellular transmission base stations and signal amplifiers. Motorola's home and broadcast network products include researcher and executive is considered to be the inventor of the first practical mobile phone for hand-held use in a non-vehicle setting, after a long race against Bell Labs Bell Laboratories is the research and development organization of Alcatel-Lucent and previously of the American Telephone & Telegraph Company (AT&T) for the first portable mobile phone. Using a modern, if somewhat heavy portable handset, Cooper made the first call on a hand-held mobile phone on April 3, 1973 to his rival, Dr. Joel S. Engel Joel S. Engel is an American engineer, known for fundamental contributions to the development of cellular networks of Bell Labs Bell Laboratories is the research and development organization of Alcatel-Lucent and previously of the American Telephone & Telegraph Company (AT&T).[6]
The first commercially automated cellular network (the 1G 1G refers to the first-generation of wireless telephone technology, mobile telecommunications. These are the analog telecommunications standards that were introduced in the 1980s and continued until being replaced by 2G digital telecommunications. The main difference between two succeeding mobile telephone systems, 1G and 2G, is that the radio generation) was launched in Japan by NTT Nippon Telegraph and Telephone Corporation , commonly known as NTT, is a telephone company that dominates the telecommunication market in Japan. Ranked the 44th in Fortune Global 500, NTT is the largest telecommunications company in Asia, and the second-largest in the world in terms of revenue in 1979, initially in the metropolitan area of Tokyo. Within five years, the NTT network had been expanded to cover the whole population of Japan and became the first nation-wide 1G network. In 1981, this was followed by the simultaneous launch of the Nordic Mobile Telephone NMT is the first fully-automatic cellular phone system. It was specified by Nordic telecommunications administrations (PTTs) starting in 1970, and opened for service in 1981 as a response to the increasing congestion and heavy requirements of the manual mobile phone networks: ARP (150 MHz) in Finland and MTD (450 MHz) in Sweden, Norway and Denmark (NMT) system in Denmark Denmark is a constitutional monarchy with a parliamentary system of government. Denmark has a state-level government and local governments in 98 municipalities. Denmark has been a member of the European Union since 1973, although it has not joined the Eurozone. Denmark is a founding member of NATO and the OECD. Denmark is also a member of the, Finland Finland (pronounced /ˈfɪnlənd/ ), officially the Republic of Finland Finnish: Suomi; Swedish: Finland (help·info), is a Nordic country situated in the Fennoscandian region of Northern Europe. It is bordered by Sweden on the west, Norway on the north and Russia on the east, while Estonia lies to its south across the Gulf of Finland, Norway After World War II, Norway experienced rapid economic growth, with the first two decades due to the Norwegian shipping and merchant marine and domestic industrialization, and from the early 1970s, a result of exploiting large oil and natural gas deposits that had been discovered in the North Sea and the Norwegian Sea. Today, Norway ranks as the and Sweden Sweden (pronounced /ˈswiːdən/ SWEE-dən, Swedish: Sverige pronounced [ˈsveːrijə] ( listen)), officially the Kingdom of Sweden (Swedish: Konungariket Sverige (help·info)), is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden has land borders with Norway to the west and Finland to the northeast, and water borders with.[7]. NMT was the first mobile phone network featuring international roaming In wireless telecommunications, roaming is a general term referring to the extension of connectivity service in a location that is different from the home location where the service was registered. Roaming ensures that the wireless device is kept connected to the network, without losing the connection. The term "roaming" originates from. The first 1G network launched in the USA was Chicago based Ameritech in 1983 using the Motorola DynaTAC mobile phone. Several countries then followed in the early 1980s including the UK, Mexico and Canada. .
The first "modern" network technology on digital 2G (second generation) cellular technology was launched by Radiolinja (now part of Elisa Group) in 1991 in Finland on the GSM standard which also marked the introduction of competition in mobile telecoms when Radiolinja challenged incumbent Telecom Finland (now part of TeliaSonera) who ran a 1G NMT network.
In 2001 the first commercial launch of 3G (Third Generation) was again in Japan by NTT DoCoMo on the WCDMA standard.[8]
One of the newest 3G technologies to be implemented is High-Speed Downlink Packet Access (HSDPA). It is an enhanced 3G (third generation) mobile telephony communications protocol in the High-Speed Packet Access (HSPA) family, also coined 3.5G, 3G+ or turbo 3G, which allows networks based on Universal Mobile Telecommunications System (UMTS) to have higher data transfer speeds and capacity.
Handset Features
A Nokia phone with box. A printed circuit board inside a mobile phone Main articles: Mobile phone features and SmartphoneAll mobile phones have a number of features in common, but manufacturers also try to differentiate their own products by implementing additional functions to make them more attractive to consumers. This has led to great innovation in mobile phone development over the last twenty years.
The common components found on all phones are:
- a SIM card which allows the phone user access to the particular mobile phone operator that they have a subscription with
- a rechargeable battery providing the power source for the phone functions
- an input mechanism and display to allow the user to interact with the phone. The most common input mechanism is a keypad, but touch screens are also found in some high end smart phones.
- basic mobile phone services to allow users to make calls and send text messages.
Low-end mobile phones are often referred to as feature phones, and offer basic telephony, as well as functions such as playing music and taking photos, and sometimes simple applications based on generic managed platforms such as Java ME or BREW. Handsets with more advanced computing ability through the use of native software applications became known as smart phones. The first smartphone was the Nokia 9000 Communicator in 1996 which added PDA functionality to the basic mobile phone at the time. As miniaturisation and increased processing power of microchips has enabled ever more features to be added to phones, the concept of the smartphone has evolved, and what was a high-end smartphone five years ago, is a standard phone today.
Several phone series have been introduced to address a given market segment, such as the RIM BlackBerry focusing on enterprise/corporate customer email needs; the SonyEricsson Walkman series of musicphones and Cybershot series of cameraphones; the Nokia Nseries of multimedia phones, the Palm Pre the HTC Dream and the Apple iPhone.
Other features that may be found on mobile phones include GPS navigation, music (MP3) and video (MP4) playback, RDS radio receiver, alarms, memo recording, personal digital assistant functions, ability to watch streaming video, video download, video calling, built-in cameras (1.0+ Mpx) and camcorders (video recording), with autofocus and flash, ringtones, games, PTT, memory card reader (SD), USB (2.0), infrared, Bluetooth (2.0) and WiFi connectivity, instant messaging, Internet e-mail and browsing and serving as a wireless modem. Nokia and the University of Cambridge demonstrated a bendable cell phone called the Morph.[9]
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Tue, 31 Aug 2010 18:12:44 GMT+00:00
launches dual handsets starting at Rs 2599 One News Page 3 hours ago killthebillion Nokia launches two dual SIM phones- C1 and C2: Nokia, the Finland based mobile phone manufacturer declares the dua... ...
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Sat, 04 Sep 2010 18:58:01 GM
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Q. What is the difference between capacitive touchscreen and resistive touchscreen in mobile phones? Which one is better?
Asked by arun p - Thu Jan 21 10:26:12 2010 - - 1 Answers - 0 Comments
A. resistive touchscreen works with tiny little dots, you can see them if you look close enough normally. resistive is truly touch screen, whether thats with your finger or not, capacitive works on the heat of your finger, so you cannot use a stylus, but this type nornally responds better
Answered by Sparkle - Thu Jan 21 10:34:38 2010
