O2, known as the commercial brand of Telefónica UK Limited, was founded in 2001 and is headquartered in Slough, UK. Operating within the telecommunications sector, O2 provides a wide range of digital communication services, including 2G, 3G, and 4G networks, as well as O2 Wifi, and it co-owns Tesco Mobile. The company prides itself on high customer satisfaction and maintains a strong presence with over 450 retail stores and various sponsorships, including The O2 arena and the England rugby team.