O2 (UK) O2 (UK) Telefónica UK Limited (trading as O2 – stylised as O) is a telecommunications services provider in the United Kingdom, owned by the Spanish multinational Telefónica, and is headquartered in Slough. With 25 million subscribers (as of December 2017), O2 is the second-largest mobile network operator in the United Kingdom after EE, with Vodafone in third place. O2 was formed in 1985 as Cellnet, a 60:40 joint venture between BT Group and Securicor. In 1999, BT Group acquired Securicor's share of Cellnet and the company was later rebranded as BT Cellnet. In June 2000, BT Cellnet launched the world's
Communications Technology High School Communications Technology High School. The current principal is Colette Langston. Communications Technology High School students are required to wear school uniforms. The uniforms are white golf shirts with the school's name on the right or black shirts with navy blue or black khaki bottoms and skirts. SEPTA serves routes 36, 37, 108 and the 400-series. Communications Technology High School Communications Technology High School was a secondary high school serving grades 9–12 and the school is located at 8110 Lyons Avenue in Hedgerow neighborhood of Philadelphia, Pennsylvania. It was part of the School District of Philadelphia's Comprehensive High School Region. The