O2: 0843 504 7239

O2 is one of the UK’s major mobile phone networks – it is also the parent company of Giffgaff, and the sponsor of the The O2 (the Greenwich estate containing the Millennium Dome) as well as the O2 Arena within the Dome.

To find out what’s up with your mobile connection today, to topup your PAYG balance under O2’s Pay And Go service, revise your current mobile contract, or make any other sales-related or account-related enquiries, contact O2 UK customer services on 0843 504 7239 (at £0.07/min plus network access charge) or use their mobile-friendly contact number: 0344 809 0222 or visit the official O2 UK website o2.co.uk for further contact details.