Portal:Telephones
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Portal:Telephones

Candlestick-telephone icon.svg The Telephones Portal Smartphone icon - Noun Project 283536.svg

A rotary dial telephone, c. 1940s

A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be 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: ? (t?le, far) and ? (ph?n?, voice), together meaning distant voice. A common short form of the term is phone, which came into use almost immediately after the first patent was issued.

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, cellular phone, cell phone, cellphone, handphone, or hand phone, sometimes shortened to simply mobile, cell or just phone, 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. 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 cellular telephones or cell phones in North America. In addition to telephony, digital mobile phones (2G) support a variety of other services, such as text messaging, MMS, email, Internet access, short-range wireless communications (infrared, Bluetooth), business applications, video games and digital photography. Mobile phones offering only those capabilities are known as feature phones; mobile phones which offer greatly advanced computing capabilities are referred to as smartphones. (Full article...)

A smartphone is a portable device that combines mobile telephone and computing functions into one unit. They are distinguished from feature phones by their stronger hardware capabilities and extensive mobile operating systems, which facilitate wider software, internet (including web browsing over mobile broadband), and multimedia functionality (including music, video, cameras, and gaming), alongside core phone functions such as voice calls and text messaging. Smartphones typically contain a number of metal-oxide-semiconductor (MOS) integrated circuit (IC) chips, include various sensors that can be leveraged by pre-included and third-party software (such as a magnetometer, proximity sensors, barometer, gyroscope, accelerometer and more), and support wireless communications protocols (such as Bluetooth, Wi-Fi, or satellite navigation). (Full article...)

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Bell logo.svg

Bell Canada (commonly referred to as Bell) is a Canadian telecommunications company headquartered at 1 Carrefour Alexander-Graham-Bell in the borough of Verdun in Montreal, Quebec, Canada. It is an ILEC (incumbent local exchange carrier) in the provinces of Ontario and Quebec; as such, it was a founding member of the Stentor Alliance. It is also a CLEC (competitive local exchange carrier) for enterprise customers in the western provinces.

Its subsidiary Bell Aliant provides services in the Atlantic provinces. It provides mobile service through its Bell Mobility (including flanker brand Virgin Mobile Canada) subsidiary, and television through its Bell Satellite TV (direct broadcast satellite) and Bell Fibe TV (IPTV) subsidiaries.

Bell Canada's principal competitors are Rogers Communications in Ontario, Telus and Shaw Communications in Western Canada, and Quebecor (Videotron) and Telus in Quebec. The company serves over 13 million phone lines and is headquartered at the Campus Bell complex in the borough of Verdun in Montreal.[irrelevant citation] (Full article...)
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Modern emergency telephone powered by sound alone
A sound-powered telephone is a communication device that allows users to talk to each other with the use of a handset, similar to a conventional telephone, but without the use of external power. This technology has been used since at least 1944 for both routine and emergency communication on ships to allow communication between key locations on a vessel if power is unavailable. A sound-powered phone circuit can have two or more stations on the same circuit. The circuit is always live, thus a user begins speaking rather than dialing another station. Sound-powered telephones are not normally connected to a telephone exchange. (Full article...)

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2600 Hz is a frequency in hertz (cycles per second) that was used by AT&T as a steady signal to mark currently unused long-distance telephone lines. (Full article...)

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W. Rae Young, 2006

William Rae Young, Jr. (October 30, 1915 - March 7, 2008) was one of the Bell Labs engineers that invented the cell phone.

The history of cellular phone technology began in December 1947 with a Bell Labs internal report in which Rae Young suggested the hexagonal cell concept for a cellular mobile telephone system. (Full article...)

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Telephones in the news

1 July 2021 - Economy of Uganda
Uganda imposes a new tax rate for using the internet as the government orders a 12% excise duty on mobile data. President Yoweri Museveni defends the tax as he says that social media users are "endlessly donating money to foreign telephone companies through chatting or even lying" and described the use of social media as a "luxury". This tax proposal, which takes effect immediately, resulted in protests in 2018 and 2019. (Africa Feeds)

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  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

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