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
Frontier Communications of Mondovi Frontier Communications of Mondovi Frontier Communications of Mondovi LLC is a telephone operating of Frontier Communications providing local telephone services to Mondovi, Wisconsin. The company was founded in 1904 as the Mondovi Telephone Company. It was later acquired by Rochester Telephone. In 1994, Rochester Tel changed its name to Frontier Corporation, resulting in Mondovi Telephone becoming Frontier Communications of Mondovi, Inc. The company later became an LLC. Many people regard Frontier Communications as the worst in the industry, offering a 3Mbps connection in rural Mondovi. Users rarely receive said speeds. There was an outage on 4/25/17 that lasted from approximately