O2 is the commercial brand of Telefonica UK Limited. Ofcom claims that O2 is a leading digital communication company with the highest customer satisfaction. O2 has more than 23 million users, operates 2G, 3G and 4G networks in the UK, operates O2 Wifi, and owns half of Tesco Mobile.
O2 has become the latest mobile network operator of 5G in the UK, and deployed its new high-speed 5G network in six cities in the UK.
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Telefónica, founded in 1924, is a large multinational telecommunications company in Spain, mainly operating in Spain and Latin America. It is one of the largest fixed-line and mobile telecommunications companies in the world, with the fourth largest number of users and the sixth largest total market value.
Telefónica has achieved global expansion by acquiring and cooperating with local telecommunications companies, including the Czech Republic, Britain, Ireland, Germany and the Isle of Man in Europe. Argentina, Brazil, Chile, Peru and Puerto Rico in Latin America; And Morocco in Africa.
Spain
Telefonica is the largest company in Spain. It owns Telefonica de Espa, Spain's largest fixed telephone and ADSL operator? Telefonica Moviles (movistar brand), the largest mobile phone operator in Spain.
Terra Networks, S.A.-an Internet subsidiary and Spanish telephone public information yellow pages publisher.
Czech Republic
In 2005, Telefó nica bought it? esk？ The former state-owned Czech telecom operator still dominates the Czech fixed-line telephone market. As part of the deal, Telefó nica also acquired Eurotel, the largest mobile phone operator in the Czech Republic.
Baidu Encyclopedia-Telefonica