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
SBA Communications 20,079 towers. The company also managed or leased approximately 4,800 actual or potential towers. In addition, it provides various site development services comprising network pre-design; site audits; identification of potential locations for towers and antennas; support in buying or leasing of the location; assistance in obtaining zoning approvals and permits; tower structure construction; antenna installation; and radio equipment installation, commissioning, and maintenance. SBA Communications Corporation was founded in 1989 and is headquartered in Boca Raton, Florida. The current CEO is Jeffrey A. Stoops. SBA Communications SBA Communications Corporation owns and operates wireless infrastructure, including small cells, indoor/outdoor distributed antenna systems,