O2: 0843 504 7239

To contact O2’s customer service team, use phone number 0843 5047 239 or 0344 809 0222 for mobile phone customers and mobile broadband customers.

O2 store

In the UK, O2 is one of the biggest providers of telecommunications services; with yearly revenues of almost £3 billion, the company oversees millions of distinct mobile phone contracts belonging to individuals and businesses. Originally a spinoff brand from a newly privatised BT service; O2 is now a household name and one of the leading companies in the UK telecoms industry today.

Nowadays O2 is busy modernising its services to suit the growing demands and increasing diversity of the mobile market. Younger customers want to browse the net, stream video and play games via large ‘phablet’ style phones as well as wanting to reliably access HD video means that its services have had to be upgraded and modernised. When surveyed, O2 contract holders tend to place these features very highly in importance. Businesses meanwhile highly rate reliable Skype and VOIP access as a compliment to paid domestic call charges.

How to contact O2 customer service

  • O2 general enquiries 0843 5047 239.
  • O2’s main advertised customer service contact number is 0344 809 0222.
  • Pay As You Go (PAYG) top-up services can be accessed on 0345 606 2277.
  • Business customers should call 0800 977 7337.

Operation hours for all O2 UK customer service numbers are 8am-8pm Monday to Friday, and 9am-5pm on Saturdays & Sundays.

To send O2 a letter in the post to, write to:

Telefónica UK Limited
Correspondence Department
PO Box 202
Houghton Regis

O2 no longer publishes its customer care email address and they no longer reply to customer service emails directly. However, they do have an online live chat feature on their Contact Us page:  http://www.o2.co.uk/contactus

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