O2 (UK) cent share of Cellnet for £3.15 billion. Cellnet had five million customers at the time of its acquisition. The company was later rebranded as BT Cellnet , and it became a part of BT Wireless, a group of companies owned by BT. BT announced on 3 September 2001 that the BT Wireless business would be spun off from the main group as a newly listed holding company, mmO2 plc, operating under the "O2" brand. Shareholders approved the plan at an extraordinary general meeting on 23 October 2001. BT Cellnet relaunched as "O2" on 18 June 2002, along with other former
O2 (Ireland) available to customers paying similar amounts in the UK. Less than 48 hours after the much hyped launch of Apple's latest model, owners of all phones on the O2 network discovered they could not access the internet at all due to a network failure. Further criticism came from iPhone customers regarding the continued failure of O2 to deploy Visual Voicemail. O2 was the only carrier in the world to launch the original iPhone without Visual Voicemail, one of its headline features. O2 was responsible for the highest number of registered judgments, which financially blacklists those people who do not pay