O2 Contact Number: 0344 809 0202

Contact O2 over the phone via their customer service number 0344 809 0202 to upgrade your existing mobile handset, to query your Pay Monthly bills and to top up your credit if you are on a Pay & Go tariff.

O2 are one of the most popular mobile networks operating in the United Kingdom, with a large number of subsidiaries based across Europe adding to their commercial portfolio. You can call their customer service phone number 0344 809 0202 to contact their sales team where you can upgrade your Pay Monthly handset to the latest iPhone or Android model. You can also contact this help desk if you are an existing contract holder to enquire about a bill payment and to receive a refund if you believe your phone has been used fraudulently to call a premium-rate number. Furthermore if you would like to sign up to an O2 contract you can call their friendly staff to get the information on the price you will be paying on each particular tariff, allowing you to choose the mobile deal that is right for you. Finally if you would like to complain to O2 about a telephone bill, the conduct of a member of their staff or a lack of mobile signal in your area.

Calls to the O2 customer service contact number 0344 809 0202 are charged at the same rate as phoning an 02 or 02 geographic area code number. Alternatively you can phone O2 for free if you are an existing customer by dialling 202 from your mobile handset.

O2 Pay & Go – 0344 809 0222

Call O2 Pay & Go on their telephone contact number 0344 809 0222 to top up your mobile phone credit and to get details of which rewards bundles you are eligible for. Furthermore if you are having technical difficulties whilst topping up or inserting your SIM card you should call this customer care team for troubleshooting support. Alternatively if you would simply like to top up your phone or check your balance you can dial 4444 on your registered handset. Lines are open 8am-9pm Monday-Friday, 8am-8pm Saturday and 8am-6pm Sunday, however opening times may be reduced on UK bank holidays such as Christmas Day.

O2 contact numbers

O2 department Phone number
Pay Monthly – UK 0344 809 0202
Pay Monthly – calls from an O2 handset 202
Pay Monthly – international +44 344 809 0202
Pay & Go – UK 0344 809 0222
Pay & Go – calls from an O2 handset 4445
Pay & Go – international +44 7860 980 202
Business customer services – UK 0800 977 7337
Business customer services – calls from an O2 handset 8002
Business customer services – international +44 844 809 0200
Sales 08442 02 02 02 (7p/minute + access charge)
O2 travel insurance – customer services & claims 0844 463 02 02 (7p/minute + access charge)
O2 travel insurance – emergency helpline (UK) 020 8239 3902
O2 travel insurance – emergency helpline (international) +44 20 8239 3902

Write to O2

If you would prefer to make your enquiries to O2 in writing you can send your letter to their customer service department using this postal address:

O2 Customer Services,
Telefónica UK Limited,
Correspondence Department,
PO Box 202,
Houghton Regis,
United Kingdom.

Alternatively if you have a serious complaint you should direct your enquiries to their UK head office which is based in Slough by using this address:

Telefónica UK Limited,
260 Bath Road,
SL1 4DX,
United Kingdom.