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O2 is a telecommunications company based in the United Kingdom. It is a subsidiary of the Spanish multinational telecommunications company, Telefónica. O2 provides mobile network services to both consumers and businesses, including voice, messaging, data, and other digital services.O2 was originally launched in 1985 as Cellnet, a joint venture between BT Group (formerly British Telecom) and Securicor. In 2001, BT Group sold its stake in Cellnet to Telefónica, and the company was rebranded as O2 in 2002.O2 operates its own mobile network infrastructure in the UK, which covers around 99% of the population with 4G coverage. The company also offers 5G services in select areas. O2 provides mobile phone plans to consumers with options for pay-as-you-go and contract plans.In addition to mobile services, O2 also offers broadband internet and fixed-line telephone services to customers in the UK. The company has a range of offerings for both residential and business customers.O2 is known for its customer-centric approach and has won several awards for its customer service. The company also focuses on sustainability initiatives and has set targets to reduce its carbon emissions and promote responsible business practices.Overall, O2 is a leading telecommunications provider in the UK that offers mobile network services, broadband internet, and fixed-line telephone services to consumers and businesses.

O2's main products include mobile phone plans, broadband services, and various digital and smart home solutions.