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Mobile phone - Wikipedia, the free encyclopedia. Evolution of mobile phones, to an early smartphone. A mobile phone is a portable telephone that can make and receive calls over a radio frequency carrier while the user is moving within a telephone service area.
The radio frequency link establishes a connection to the switching systems of a mobile phone operator, which provides access to the public switched telephone network (PSTN). Most modern mobile telephone services use a cellular network architecture, and therefore mobile telephones are often also called cellular telephones or cell phones. In addition to telephony, 2. MMS, email, Internet access, short- range wireless communications (infrared, Bluetooth), business applications, gaming, and digital photography. Mobile phones which offer these and more general computing capabilities are referred to as smartphones.
The first handheld mobile phone was demonstrated by John F. From 1. 98. 3 to 2. This is a reenactment in 2. A handheld mobile radio telephone service was envisioned in the early stages of radio engineering. In 1. 91. 7, Finnish inventor Eric Tigerstedt filed a patent for a .
Early predecessors of cellular phones included analog radio communications from ships and trains. The race to create truly portable telephone devices began after World War II, with developments taking place in many countries. The advances in mobile telephony have been traced in successive . First commercially available handheld cellular mobile phone, 1. The first handheld mobile cell phone was demonstrated by Motorola in 1. The first commercial automated cellular network was launched in Japan by Nippon Telegraph and Telephone in 1.
This was followed in 1. Nordic Mobile Telephone (NMT) system in Denmark, Finland, Norway and Sweden.
These first- generation (1. G) systems could support far more simultaneous calls, but still used analog technology. In 1. 99. 1, the second- generation (2. G) digital cellular technology was launched in Finland by Radiolinja on the GSM standard. This sparked competition in the sector as the new operators challenged the incumbent 1. G network operators.
Ten years later, in 2. G) was launched in Japan by NTT Do. Co. Mo on the WCDMA standard. The first two commercially available technologies billed as 4. G were the Wi. MAX standard, offered in North America by Sprint, and the LTE standard, first offered in Scandinavia by Telia.
Sonera. Features. All mobile phones have a variety of features in common, but manufacturers seek product differentiation by adding functions to attract consumers.
This competition has led to great innovation in mobile phone development over the past 2. The common components found on all phones are: A battery, providing the power source for the phone functions.
An input mechanism to allow the user to interact with the phone. The most common input mechanism is a keypad, but touch screens are also found in most smartphones. A screen which echoes the user's typing, displays text messages, contacts and more.
Basic mobile phone services to allow users to make calls and send text messages. All GSM phones use a SIM card to allow an account to be swapped among devices. Some CDMA devices also have a similar card called a R- UIM. Individual GSM, WCDMA, i. DEN and some satellite phone devices are uniquely identified by an International Mobile Equipment Identity (IMEI) number.
Low- end mobile phones are often referred to as feature phones, and offer basic telephony. Handsets with more advanced computing ability through the use of native software applications became known as smartphones. Several phone series have been introduced to address specific market segments, such as the RIMBlack. Berry focusing on enterprise/corporate customer email needs, the Sony- Ericsson 'Walkman' series of music/phones and 'Cyber- shot' series of camera/phones, the Nokia Nseries of multimedia phones, the Palm Pre, the HTC Dream and the Apple i. Phone. Sound quality. In sound quality, smartphones and feature phones vary little. Some audio- quality enhancing features, such as Voice over LTE and HD Voice, have appeared and are often available on newer smartphones.
Sound quality can remain a problem with both, as this depends not so much on the phone itself, as on the quality of the network and, in long distance calls, the bottlenecks/choke points met along the way. In some cases smartphones can improve audio quality even on long- distance calls, by using a Vo. IP phone service, with someone else's Wi. Fi/internet connection.