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Everything about O2 (UK)
British telecommunications provider
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. Wikipedia →
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- Read the overview: O2 (UK)A 5-minute orientation
- Pick up a classic book: Vodafone, O2, Orange and T-MobileThe most-reprinted book on the subject
- Go sideways: O2 (brand)A closely related topic
- Go sideways: Virgin Media O2A closely related topic
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📚 Books worth reading
Vodafone, O2, Orange and T-MobileGreat Britain. Competition Commission. · 2003
Ranked by number of editions on Open Library, a rough measure of how lasting a book is.
🔗 Related topics
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- Telefónica Telefónica, S.A. (Spanish pronunciation: [teleˈfonika]) is a Spanish multinational telecommunications company. It has headquarters as well as a registered…