BT Group plc is a British multinational telecommunications holding company headquartered in London, England. It has operations in around 180 countries and is the largest provider of fixed-line, broadband and mobile services in the UK, and also provides subscription television and IT services.
The Isle of Man has an extensive communications infrastructure consisting of telephone cables, submarine cables, and an array of television and mobile phone transmitters and towers.
Telecommunications in the United Kingdom have evolved from the early days of the telegraph to modern broadband and mobile phone networks with Internet services.
The BT Tower is a grade II listed communications tower in Fitzrovia, London, England, owned by BT Group, also known as the GPO Tower, the Post Office Tower, and Telecom Tower. The main structure is 581 feet (177 m) high, with a further section of aerial rigging bringing the total height to 620 feet (189 m).
Deutsche Telekom AG is a German telecommunications company headquartered in Bonn and is the largest telecommunications provider in Europe by revenue. It was formed in 1995 when Deutsche Bundespost, a state monopoly at the time, was privatized. Since then, Deutsche Telekom has consistently featured among FortuneMagazine's top Global 500 companies by revenue, with its ranking as of 2022 at number 62. The company operates several subsidiaries worldwide, including the mobile communications brand T-Mobile.
Eircom Limited, trading as Eir, is a large fixed, mobile and broadband telecommunications company in Ireland. The now privatised company, which is currently incorporated in Jersey, traces its origins to the Ireland's former state-owned monopoly telecommunication provider Telecom Éireann and its predecessors, P&T and before the foundation of the state, the telecommunications division of the GPO. It remains the largest telecommunications operator in Ireland and has overseas operations focused on the business and corporate telecom markets in the United Kingdom. The company was in majority state ownership until 1999, when it was privatised through a floatation on the Irish and New York Stock Exchanges.
O2 (typeset as O2) is a global brand name owned by the Spanish telecommunications company Telefónica. The company uses the O2 brand for its subsidiaries in the United Kingdom and Germany. Since 2018, it is also used as an online-only flanker brand in Spain.
Telefónica Ireland was a broadband and telecommunications provider in Ireland that traded under the O2 brand (typeset as O2). O2 Ireland was previously called Esat Digifone when it was owned by Esat Telecommunications (and Telenor) from 1997 to 2006.
BT Communications (Ireland) Limited is a telecommunications and internet company in Ireland. It is a subsidiary of BT Group plc.
Mercury Communications was a national telephone company in the United Kingdom, formed in 1981 as a subsidiary of Cable & Wireless, to challenge the then-monopoly of British Telecom (BT). Although it proved only moderately successful at challenging BT's dominance, it led the way for new communication companies to attempt the same.
Cable & Wireless plc was a British telecommunications company. In the mid-1980s, it became the first company in the UK to offer an alternative telephone service to British Telecom. The company later offered cable TV to its customers, but it sold its cable assets to NTL in 2000. It remained a significant player in the UK telecoms market and in certain overseas markets, especially in the former British colonies of the Caribbean, where it was formerly the monopoly incumbent. It was also the main supplier of communication in the British South Atlantic, including Saint Helena and the Falkland Islands. It was listed on the London Stock Exchange and was a constituent of the FTSE 100 Index.
Marconi Communications, the former telecommunications arm of Britain's General Electric Company plc (GEC), was founded in August 1998 through the amalgamation of GEC Plessey Telecommunications (GPT) with other GEC subsidiaries: Marconi SpA, GEC Hong Kong, and ATC South Africa.
The British Approvals Board for Telecommunications (BABT) is a telecommunications certification body.
The One Per Desk, or OPD, was an innovative hybrid personal computer/telecommunications terminal based on the hardware of the Sinclair QL. The One Per Desk was built by International Computers Limited (ICL) and launched in the United Kingdom in 1984. It was the result of a collaborative project between ICL, Sinclair Research and British Telecom begun in 1983, originally intended to incorporate Sinclair's flat-screen CRT technology.
The BT Archives is an archive preserving the documentary heritage of the British telecoms company BT and its public sector predecessors. It is designated an official place of deposit for Public Records, for those records created prior to BT's privatisation in 1984.
Concert Communications Services was a $1 billion joint venture, originally launched June 1994 by BT Group and MCI Communications. Portugal Telecom became a partner in 1997.
Openreach Limited is a company wholly owned by BT Group plc, that maintains the telephone cables, ducts, cabinets and exchanges that connect nearly all homes and businesses in the United Kingdom to the national broadband and telephone network. It was established in 2006 following an agreement between BT and the UK's telecoms regulator, Ofcom, to implement certain undertakings, pursuant to the Enterprise Act 2002, to ensure that rival telecom operators have equality of access to BT's local network.
Manx Telecom Ltd. is the primary provider of broadband and telecommunications on the Isle of Man. It is owned by Basalt Infrastructure Partners LLP.
BT Global is a division of United Kingdom telecommunications company BT Group that provides global security, cloud and networking services to multinational companies worldwide, with operations in 180 countries. It was established in July 2000 as BT Ignite.
Telefonica UK Limited, trading as O2 UK (stylised as O2), is a British telecommunications services provider, headquartered in Slough, England which operates under the O2 brand. It is owned by VMED O2 UK Limited, a 50:50 joint venture between Telefónica and Liberty Global. O2 is the UK's largest mobile network operator, with 23.8 million subscribers as of May 2023.
