o2

Telefónica UK Limited (trading as O2 – stylised as O2) is a telecommunications services provider in the United Kingdom, owned by the Spanish multinational Telefónica, and is headquartered in Slough. With 25.1 million subscribers (as of May 2019), O2 is the second-largest mobile network operator in the United Kingdom after EE, with Vodafone in third place.

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