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O2 (UK)

Telefonica UK Limited, trading as O2 UK (stylised as O2), is a British telecommunications services provider. It is the second largest mobile network in the United Kingdom behind VodafoneThree, with approximately 22.4 million subscribers as of December 2025. The name derives from the oxygen molecule.

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Founded
28 July 1983; 43 years ago (1983-07-28)
Industry
Telecommunications
Headquarters
Reading, England
Area served
United Kingdom
Formerly
Telecom Securicor Cellular Radio Limited (1983–2000) · BT Cellnet Limited (2000–2002) · O2 (UK) Limited (2002–2008) · Telefónica O2 UK Limited (2008–2011) · Telefonica O2 UK Limited (2011)
Founder
John Carrington

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Overview

History

Network

Former operations

Marketing

Environmental record

Advanced semantic analysis

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Map overview Semantic statistics

O2 (UK)

Nodes109
Edges108
Triples20
Avg. degree1.98
Density0.018349
Components1

How this topic connects Entity context

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O2 (UK)

Top relations

Formerly · 5
O2 (UK) → BT Cellnet Limited (2000–2002), O2 (UK) Limited (2002–2008), Telecom Securicor Cellular Radio Limited (1983–2000), Telefonica O2 UK Limited (2011), Telefónica O2 UK Limited (2008–2011)
Trade name · 3
O2 (UK) → BT Cellnet (1999–2002), Cellnet (1985–1999), O2 (2002–present)
Subsidiaries · 2
O2 (UK) → giffgaff, Tesco Mobile (50%)
Area served · 1
O2 (UK) → United Kingdom
Founded · 1
O2 (UK) → 28 July 1983; 43 years ago (1983-07-28)
Founder · 1
O2 (UK) → John Carrington
Headquarters · 1
O2 (UK) → Reading, England
Industry · 1
O2 (UK) → Telecommunications
Key people · 1
O2 (UK) → Lutz Schüler (CEO)
Parent · 1
O2 (UK) → Virgin Media O2

Important terminology Word statistics

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Important terminology

o2 telefónica bt mobile network uk company cellnet brand telecommunications announced would million june service plc merger 2002 virgin media

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
O2 (UK)Area servedUnited Kingdom1.00infobox
O2 (UK)FormerlyTelecom Securicor Cellular Radio Limited (1983–2000)1.00infobox
O2 (UK)FormerlyBT Cellnet Limited (2000–2002)1.00infobox
O2 (UK)FormerlyO2 (UK) Limited (2002–2008)1.00infobox
O2 (UK)FormerlyTelefónica O2 UK Limited (2008–2011)1.00infobox
O2 (UK)FormerlyTelefonica O2 UK Limited (2011)1.00infobox
O2 (UK)Founded28 July 1983; 43 years ago (1983-07-28)1.00infobox
O2 (UK)FounderJohn Carrington1.00infobox
O2 (UK)HeadquartersReading, England1.00infobox
O2 (UK)IndustryTelecommunications1.00infobox
O2 (UK)Key peopleLutz Schüler (CEO)1.00infobox
O2 (UK)ParentVirgin Media O21.00infobox
O2 (UK)Revenue£6.510 billion (2017)1.00infobox
O2 (UK)Subsidiariesgiffgaff1.00infobox
O2 (UK)SubsidiariesTesco Mobile (50%)1.00infobox
O2 (UK)Trade nameO2 (2002–present)1.00infobox
O2 (UK)Trade nameBT Cellnet (1999–2002)1.00infobox
O2 (UK)Trade nameCellnet (1985–1999)1.00infobox
O2 (UK)TypeSubsidiary1.00infobox
O2 (UK)Websiteo2.co.uk1.00infobox

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