Landline

fixed linefixed-lineland linefixedFixed Telephonylandline telephonelandlinesFixed-line telephonylandline phonelandline telephones
A landline telephone (also known as land line, land-line, main line, home phone, landline, fixed-line, and wireline) is a phone that uses a metal wire or optical fiber telephone line for transmission as distinguished from a mobile cellular line, which uses radio waves for transmission.wikipedia
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Telephone

phonetelephonesLocal Telephone Service
A landline telephone (also known as land line, land-line, main line, home phone, landline, fixed-line, and wireline) is a phone that uses a metal wire or optical fiber telephone line for transmission as distinguished from a mobile cellular line, which uses radio waves for transmission. In 2003, the CIA World Factbook reported approximately 1.263 billion main telephone lines worldwide.
This gave rise to landline telephone service in which each telephone is connected by a pair of dedicated wires to a local central office switching system, which developed into fully automated systems starting in the early 1900s, and eventually into a worldwide public switched telephone network.

Telephone line

phone linelinetelephone lines
A landline telephone (also known as land line, land-line, main line, home phone, landline, fixed-line, and wireline) is a phone that uses a metal wire or optical fiber telephone line for transmission as distinguished from a mobile cellular line, which uses radio waves for transmission.
Telephone lines are used to deliver landline telephone service and Digital subscriber line (DSL) phone cable service to the premises.

Cordless telephone

cordless phonecordless phonescordless
A fixed phone line (a line that is not a mobile phone line) can be hard-wired or cordless and typically refers to the operation of wireless devices or systems in fixed locations such as homes.
"Plain old telephone service" (POTS) landlines are designed to transfer audio with a quality that is just adequate for the parties to understand each other.

Mobile phone

cell phonemobilemobile phones
A National Health Interview Survey of 19,956 households by the Centers for Disease Control and Prevention released May 4, 2017 showed only 45.9 percent of U.S. households still had landlines, while 50.8 percent had only cell phones.
The United Nations reported that mobile phones have spread faster than any other form of technology and can improve the livelihood of the poorest people in developing countries, by providing access to information in places where landlines or the Internet are not available, especially in the least developed countries. Use of mobile phones also spawns a wealth of micro-enterprises, by providing such work as selling airtime on the streets and repairing or refurbishing handsets.

Voice over IP

VoIPvoice over Internet Protocolvoice-over-IP
Many of the consumer protections which regulators apply to incumbent landline providers, such as restrictions against cutting off subscribers without notice, do not apply to competing communication services such as cable modems and voice over IP.
A telephone connected to a land line has a direct relationship between a telephone number and a physical location, which is maintained by the telephone company and available to emergency responders via the national emergency response service centers in form of emergency subscriber lists.

Last mile

last-milefirst-milelast kilometre
Last mile
Fixed copper lines have been subject to theft due to the value of copper, but optical fibers make unattractive targets.

Wire

stranded wirewire productsinsulated wire
A landline telephone (also known as land line, land-line, main line, home phone, landline, fixed-line, and wireline) is a phone that uses a metal wire or optical fiber telephone line for transmission as distinguished from a mobile cellular line, which uses radio waves for transmission. A fixed phone line (a line that is not a mobile phone line) can be hard-wired or cordless and typically refers to the operation of wireless devices or systems in fixed locations such as homes.

Optical fiber

fiber opticfiber opticsfibre optic
A landline telephone (also known as land line, land-line, main line, home phone, landline, fixed-line, and wireline) is a phone that uses a metal wire or optical fiber telephone line for transmission as distinguished from a mobile cellular line, which uses radio waves for transmission.

Cellular network

cellularmobile networkcellular networks
A landline telephone (also known as land line, land-line, main line, home phone, landline, fixed-line, and wireline) is a phone that uses a metal wire or optical fiber telephone line for transmission as distinguished from a mobile cellular line, which uses radio waves for transmission. A fixed phone line (a line that is not a mobile phone line) can be hard-wired or cordless and typically refers to the operation of wireless devices or systems in fixed locations such as homes.

Radio wave

radio wavesradioradio signal
A landline telephone (also known as land line, land-line, main line, home phone, landline, fixed-line, and wireline) is a phone that uses a metal wire or optical fiber telephone line for transmission as distinguished from a mobile cellular line, which uses radio waves for transmission.

The World Factbook

CIA World FactbookWorld FactbookCIA
In 2003, the CIA World Factbook reported approximately 1.263 billion main telephone lines worldwide.

China

🇨🇳ChinesePeople's Republic of China
China had more than any other country at 350 million and the United States was second with 268 million.

United States

American🇺🇸U.S.
China had more than any other country at 350 million and the United States was second with 268 million.

Electric battery

batterybatteriesbattery-powered
Fixed wireless devices usually derive their electrical power from the utility mains electricity, unlike mobile wireless or portable wireless, which tend to be battery-powered.

Public switched telephone network

PSTNtelephone networkpublic telephone network
The term landline is also used to describe a connection between two or more points that consists of a dedicated physical cable, as opposed to an always-available private link that is actually implemented as a circuit in a wired switched system (usually the public switched telephone network).

Leased line

leased linesleaseddedicated circuit
So-called leased lines are invariably of the latter type; the implications of a land line in this context are security and survivability.

Survivability

survivable
So-called leased lines are invariably of the latter type; the implications of a land line in this context are security and survivability.

Continent

continentssubcontinentcontinental
There has also been substantial decline of landline phones in Indian subcontinent, in urban and even more in rural areas.

21st century

twenty-first century21st centuriestoday
In the early 21st century, the landline telephone has declined due to the advancement of mobile network technology and the obsolescence of the old copper wire networking.

Rural area

ruralcountrysiderural locality
Eventually these metallic networks will be deemed completely out of date and replaced by more efficient broadband and fiber optic landline connections extending to rural areas and places where telecommunication was much more sparse.

Smartphone

smartphonessmart phonesmart phones
Almost 60% of those with a mobile had a smartphone.

Centers for Disease Control and Prevention

CDCCenters for Disease ControlCenter for Disease Control
A National Health Interview Survey of 19,956 households by the Centers for Disease Control and Prevention released May 4, 2017 showed only 45.9 percent of U.S. households still had landlines, while 50.8 percent had only cell phones.

Cable modem

cablecable modemscable internet
Many of the consumer protections which regulators apply to incumbent landline providers, such as restrictions against cutting off subscribers without notice, do not apply to competing communication services such as cable modems and voice over IP.