O2 (UK) they can do it too" in reference to Vodafone and EE, O2's biggest competitors and the UK's top three mobile-telecoms companies. 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
Kyocera Communications CDMA-based Push to talk service Sprint Direct Connect. In August 2014, Kyocera released the "Kyocera Brigadier", the first U.S. smartphone to be equipped with a display made of sapphire glass. Kyocera Communications Kyocera Communications, Inc. (pronounced like: key-oh-sarah) is an American manufacturer of mobile phones for wireless service providers in the United States and Canada. Kyocera Communications, Inc. is a wholly owned subsidiary of Kyocera Corporation, which also manufactures mobile phones for the Japanese wireless market under various brands. Kyocera Wireless, Inc. was originally formed in February 2000 when Kyocera acquired QUALCOMM's San Diego, California-based terrestrial handset division. Upon the