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 Money application for Android and iOS devices. The application will use NFC technology embedded in a phone to access money banked with Barclays via O2. O2 began trials of NFC technology in , with 500 individuals participating in the trial. The individuals used a specific Nokia handset to make payments at selected retailers, and travel the London Underground with transactions made via Barclays. O2 has since been in discussions with large retailers, such as Tesco and W. H. Smith, for the deployment of the necessary electronic point of sale units, and with handset manufacturers, such as Apple and Samsung, to enable