O2 UK review: Everything you need to know (July 2019)
Affiliate links on Android Authority may earn us a commission.Learn more. O2 UK review: Everything you need to know (July 2019) July 25, 2025 Of all the current UK networks, O2 has changed the most. The carrier as it exists now was “born” in 2002, but its history dates as far back as 1985. Prior to being known as O2, the BT-owned network was Cellnet (formed through a 60-40 partnership with BT and Securicor) before BT bought out its partner in 1999 and rebranded the network to BT Cellnet....