O2 Contact Number: 0344 809 0202

Contact O2 on their UK customer service telephone number 0344 809 0202 to upgrade your mobile contract, for the latest pay-as-you-go prices and to query an item on your Pay Monthly bill.

O2 is one of the largest provider of mobile phone communications within the whole of the UK, with millions of customers on their network. You should call their customer service phone number 0344 809 0202 if you are a Pay Monthly customer and you would like to make an enquiry about an item on your bill to prevent overcharging. Additionally you can also call this number to upgrade your handset to the latest iPhone or Android model, where you can also renew your contract if it has ended. By contrast you can call this customer care helpline to cancel your contract early if they have violated the terms set out in it or if you believe that you would get a better deal elsewhere. If you are an existing customer you can contact the O2 Pay Monthly department for free by dialling 202 on your mobile phone.

O2 Pay & Go – 0344 809 0222

Phone O2 on their Pay & Go phone number 0344 809 0222 to top up your phone, where you can also get price information on their bundle and bolt-on packages. If you have recently joined O2 you can also call this helpline to register your new SIM card or activate your new handset, you should also get in touch with them if your phone is not activating on their network. Alternatively you can top up your phone for free by dialling 4444 from your O2-registered handset.

O2 Business customers – 0800 977 7337

Contact O2 for free by calling their dedicated freephone number 0800 977 7337 for business customer services. Here you can purchase new handsets for your company and manage your existing telecommunications contract with the company. Additionally if you have an O2 Online service you can call 0800 977 7027 for free for technical support if your WiFi signal goes down or you are unable to make landline calls from your premises. On a similar note you should call either of these numbers if you are moving your premises so that they can update your account details and set up your broadband connections at your new location.

O2 contact numbers – at a glance

Department UK phone number
Pay Monthly & complaints 0344 809 0202
Pay & Go 0344 809 0222
Business enquiries 0800 977 7337
O2 Drive 0330 018 0802

Postal address

Although it will normally be significantly quicker to contact O2 via their telephone helplines above you can still write to them using their UK head office postal address:

Telefónica UK Limited,
Correspondence Department,
PO Box 202,
Houghton Regis,
LU6 9AG,
United Kingdom.

Network checker

If your signal has gone down you can use the official O2 network checker to check if there is an outage in your area. Similarly if you live in a rural location you can use this service to check if you will receive signal on their network.