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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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  1. Read the overview: O2 (UK)A 5-minute orientation
  2. Pick up a classic book: Vodafone, O2, Orange and T-MobileThe most-reprinted book on the subject
  3. Go sideways: O2 (brand)A closely related topic
  4. Go sideways: Virgin Media O2A closely related topic

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