Portal:Telephones
The Telephones Portal 
A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user. The term is derived from Greek: τῆλε (tēle, far) and φωνή (phōnē, voice), together meaning distant voice. A common short form of the term is phone, which came into use early in the telephone's history. Nowadays, phones are almost always in the form of smartphones or mobile phones, due to technological convergence.
In 1876, Alexander Graham Bell was the first to be granted a United States patent for a device that produced clearly intelligible replication of the human voice at a second device. This instrument was further developed by many others, and became rapidly indispensable in business, government, and in households. (Full article...)
A mobile phone (or cellphone) is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area, as opposed to a fixed-location phone (landline phone). 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). Modern mobile telephone services use a cellular network architecture, and therefore mobile telephones are called cellphones (or "cell phones") in North America. In addition to telephony, digital mobile phones support a variety of other services, such as text messaging, multimedia messaging, email, Internet access (via LTE, 5G NR or Wi-Fi), short-range wireless communications (infrared, Bluetooth), satellite access (navigation, messaging connectivity), business applications, payments (via NFC), multimedia playback and streaming (radio, television), digital photography, and video games. Mobile phones offering only basic capabilities are known as feature phones (slang: "dumbphones"); mobile phones that offer greatly advanced computing capabilities are referred to as smartphones. (Full article...)
A smartphone (often simply called a phone) is a mobile device that combines the functionality of a traditional mobile phone with advanced computing capabilities. It typically has a touchscreen interface, allowing users to access a wide range of applications and services, such as web browsing, email, and social media, as well as multimedia playback and streaming. Smartphones have built-in cameras, GPS navigation, and support for various communication methods, including voice calls, text messaging, and internet-based messaging apps. (Full article...)
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Snapdragon is a suite of system-on-a-chip (SoC) semiconductor products for mobile devices designed and marketed by Qualcomm Technologies Inc. The Snapdragon's central processing unit (CPU) uses the ARM architecture. As such, Qualcomm often refers to the Snapdragon as a "mobile platform". Snapdragon semiconductors are embedded in devices of various systems, including vehicles, Android, Windows Phone and netbooks. In addition to the processors, the Snapdragon line includes modems, Wi-Fi chips and mobile charging products.
The Snapdragon QSD8250 was released in December 2007. It included the first 1 GHz processor for mobile phones. Qualcomm introduced its "Krait" microarchitecture in the second generation of Snapdragon SoCs in 2011, allowing each processor core to adjust its speed based on the device's needs. At the 2013 Consumer Electronics Show, Qualcomm introduced the first of the Snapdragon 800 series and renamed prior models as the 200, 400 and 600 series. Several new iterations have been introduced since, such as the Snapdragon 805, 810, 615 and 410. Qualcomm re-branded its modem products under the Snapdragon name in February 2015. Asus, HP and Lenovo have begun selling laptops with Snapdragon-based CPUs running Windows 10 under the name "Always Connected PCs", marking an entry into the PC market for Qualcomm and the ARM architecture. (Full article...)Types of phones -
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A disconnect tone in telephony is a tone provided to the remaining party to a call after the remote party hangs up. Typically, the disconnect tone is a few cycles of the reorder or busy tone (e.g. in US), or between five and fifteen seconds of the Number Unobtainable tone (e.g. in UK). (Full article...)
List articles
- Comparison of smartphones
- List of best-selling mobile phones
- List of countries by number of broadband Internet subscriptions
- List of countries by number of telephone lines in use
- List of countries by smartphone penetration
- List of country calling codes
- List of iPhone models
- List of mobile network operators
- List of mobile phone brands by country
- List of mobile phone generations
- List of telephone operating companies
Related portals
General images -
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Smartphone with infrared transmitter on top for use as remote control (from Smartphone) -
1896 Telephone (Sweden) (from History of the telephone) -
Martin Cooper of Motorola, shown here in a 2007 reenactment, made the first publicized handheld mobile phone call on a prototype DynaTAC model on 3 April 1973. (from Mobile phone) -
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Typical mobile phone mini-SIM card (from Mobile phone) -
Mobile phone subscribers per 100 inhabitants. 2014 figure is estimated. (from Mobile phone) -
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A sign in the US restricting cell phone use to certain times of day (no cell phone use between 7:30–9:00 am and 2:00–4:15 pm) (from Mobile phone) -
Philipp Reis, 1861, constructed the first telephone, today called the Reis telephone. (from History of the telephone) -
The back of a Huawei P30. It features three rear-facing camera lenses with Leica optics. (from Smartphone) -
People using phones while walking (from Mobile phone) -
Private conversation, 1910 (from History of the telephone) -
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Personal Handy-phone System mobiles and modems, 1997–2003 (from Mobile phone) -
Several BlackBerry smartphones, which were highly popular in the mid-late 2000s (from Smartphone) -
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A smartphone displaying the homepage of the English Wikipedia (from Smartphone) -
IBM Simon and charging base (1994) (from Smartphone) -
This layout of the camera viewfinder was first introduced by Apple with iOS 7 in 2013. Towards the late 2010s, several other smartphone vendors have ditched their layouts and implemented variations of this layout. (from Smartphone) -
The back of a Nokia 9 PureView. It features a five-lens camera array with Zeiss optics, using a mixture of color and monochrome sensors. (from Smartphone) -
Mobile/desktop convergence: the Librem 5 smartphone can be used as a basic desktop computer (from Smartphone) -
A text message (SMS) (from Mobile phone) -
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"Device options" menu of Samsung Mobile's TouchWiz user interface as of 2013, accessed by holding the power button for a second (from Smartphone) -
Tooltip in Kiwi Browser, a Google Chromium derivative, reveals the full URL by hovering over the tab list using the stylus on a Samsung Galaxy Note 4. (from Smartphone) -
Inserted memory and SIM cards (from Smartphone) -
Actor portraying Alexander Graham Bell in a 1932 silent film. Shows Bell's second telephone transmitter (microphone), invented 1876 and first displayed at the Centennial Exposition, Philadelphia. (from History of the telephone) -
A Moto G7 Power; its display uses a tall aspect ratio and includes a "notch". (from Smartphone) -
Cellular networks work by only reusing radio frequencies (in this example frequencies f1-f4) in non adjacent cells to avoid interference (from Mobile phone) -
The LG Prada with a large capacitive touchscreen introduced in 2006 (from Smartphone) -
Bell prototype telephone stamp(from History of the telephone)
Centennial Issue of 1976 -
A 19th century acoustic tin can or "lovers' telephone" (from History of the telephone) -
Mobile payment system. (from Smartphone) -
1917 wall telephone, open to show magneto and local battery (from History of the telephone) -
A user consulting a mapping app on a phone (from Smartphone) -
A driver using two handheld mobile phones at once (from Mobile phone) -
The master telephone patent granted to Bell, 174465, March 10, 1876 (from History of the telephone) -
A New York City driver holding two phones (from Smartphone) -
Android smartphones (from Mobile phone) -
Antonio Meucci's telephone. (from History of the telephone) -
Alexander Graham Bell was awarded the first U.S. patent for the invention of the telephone in 1876. (from History of the telephone) -
A French Gower telephone of 1912 at the Musée des Arts et Métiers in Paris (from History of the telephone) -
A Samsung Galaxy S20 Plus, featuring a "hole-punch" camera (from Smartphone) -
The original Apple iPhone; following its introduction the common smartphone form factor shifted to large touchscreen software interfaces without physical keypads (from Smartphone) -
Scrapped mobile phones (from Mobile phone) -
Elisha Gray, 1876, designed a telephone using a water microphone in Highland Park, Illinois. (from History of the telephone) -
The Motorola DynaTAC 8000X. In 1983, it became the first commercially available handheld cellular mobile phone. (from Mobile phone) -
Two decades of evolution of mobile phones, from a 1992 Motorola 8900X-2 to the 2014 iPhone 6 Plus (from Mobile phone) -
Apple iPhone smartphone (from History of the telephone) -
Antonio Meucci, 1854, constructed telephone-like devices. (from History of the telephone) -
Top of cellular telephone tower (from History of the telephone) -
A sign along Bellaire Boulevard in Southside Place, Texas (Greater Houston) states that using mobile phones while driving is prohibited from 7:30 am to 9:00 am and from 2:00 pm to 4:15 pm. (from Smartphone)
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Thomas Edison invented the carbon microphone which produced a strong telephone signal. (from History of the telephone) -
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Optical track pad sensor of an HTC Legend, 2010. (from Smartphone) -
Mobile payment system (from Mobile phone) -
Old Receiver schematic, c.1906 (from History of the telephone) -
The Nokia 9110 Communicator, opened for access to keyboard (from Smartphone) -
Historical marker commemorating the first telephone central office in New York State (1878) (from History of the telephone) -
Dupuis and Haug during a GSM meeting in Belgium, April 1992 (from Mobile phone) -
Active mobile broadband subscriptions per 100 inhabitants (from Mobile phone) -
A smartphone touchscreen (from Smartphone)
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Selected biography
Alexander Graham Bell (/ˈɡreɪ.əm/, born Alexander Bell; March 3, 1847 – August 2, 1922) was a Scottish-born Canadian-American inventor, scientist and engineer who is credited with patenting the first practical telephone. He also co-founded the American Telephone and Telegraph Company (AT&T) in 1885.
Bell's father, grandfather, and brother had all been associated with work on elocution and speech, and both his mother and wife were deaf; profoundly influencing Bell's life's work. His research on hearing and speech further led him to experiment with hearing devices which eventually culminated in Bell being awarded the first U.S. patent for the telephone, on March 7, 1876. Bell considered his invention an intrusion on his real work as a scientist and refused to have a telephone in his study.
Many other inventions marked Bell's later life, including groundbreaking work in optical telecommunications, hydrofoils, and aeronautics. Bell also had a strong influence on the National Geographic Society and its magazine while serving as the second president from January 7, 1898, until 1903. (Full article...)Selected images
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Mailbox and public telephone in Haßfurt, Germany -
Android smartphones -
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Apple iPhones -
A traditional North American rotary phone dial. The associative lettering was originally used for dialing named exchanges but was kept because it facilitated memorization of telephone numbers. -
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A police box outside Earl's Court tube station in London, built in 1996 and based on the 1929 Gilbert Mackenzie Trench design -
The AUTOVON was a worldwide American military telephone system that was built starting in 1963. -
An example of a K6, the most common red telephone box model, photographed in London in 2012 -
A Bell Canada payphone with digital display -
Rotary dial telephone, probably from Belgium; the circuit diagram inside is in Dutch and French -
Telephone booth box art outside the Tower of London, 2012 -
Acoustic telephone ad, The Consolidated Telephone Co., Jersey City, New Jersey, 1886 -
Landline call blocking in use -
A Western Electric candlestick phone from the 1920s -
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A historic telephone booth in Skansen, Stockholm -
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Wooden wall telephone with a hand-cranked magneto generator -
Public telephone, Bucharest, Romania -
Rotary dial telephone, probably from Belgium; the circuit diagram inside is in Dutch and French -
Track-side emergency brake and emergency telephones at the platform of the metro station Aspern Nord, Donaustadt, Vienna, Austria -
Photograph of the interior of the Prairie Grove Airlight Outdoor Telephone Booth in Prairie Grove, Arkansas, which is listed on the National Register of Historic Places -
A Northern Electric telephone, model number N415H, circa 1950 (probably) -
Historical telephone with the German imperial eagle and the heraldic shield of the House of Hohenzollern dynasty; Vollmer's Mill, Seebach, Baden-Württemberg, Germany -
A Funke + Huster telephone inside the Idrija Mine, Slovenia -
Emergency telephones, on the Paris-Bordeaux railway line, Saint-Saviol station, Vienne, France -
Automatic electric Rotary dial telephone
Topics
| Types | |
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| Accessories | |
| Connectivity | |
| Calls | |
| Applications | |
| Mobile networks, protocols |
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| General operation | |||||||
| Mobile devices |
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| Mobile specific software |
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| Culture | |||||||
| Environment and health | |||||||
| Law | |||||||
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Cellular network standards | |||||||||
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| 0G radio telephones (1946) | |||||||||
| 1G (1979) |
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| 2G (1991) |
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| 2G transitional (2.5G, 2.75G, 2.9G) |
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| 3G (1998) IMT-2000 (2001) |
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| 3G transitional (3.5G, 3.75G, 3.9G) |
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| 4G (2009) IMT Advanced (2013) |
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| 5G (2018) IMT-2020 (2021) |
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| Related articles | |||||||||
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