O2 is a leading provider of mobile services to consumers and businesses in the UK. It is the leader in non-voice services, including text, media messaging, games, music and video, as well as data connections via GPRS, 3G and WLAN.

O2 UK is part of the wider O2 group which is a wholly-owned subsidiary of Telefónica S.A. O2 comprises mobile network operators in the UK and Ireland, along with integrated fixed/mobile businesses in Germany, the Czech Republic (Telefónica O2 Czech Republic) and the Isle of Man (Manx Telecom).  It also owns 50 percent of the Tesco Mobile and Tchibo Mobilfunk, joint venture businesses in the UK and Germany respectively.

In addition, O2 includes O2 Airwave, which supplies secure digital communications to the emergency services, including the Police, Ambulance and Fire, as well as other public safety organisations.

O2 was formed in 2001 following the demerger from British Telecom of its former mobile business, BT Wireless. 

Below we have included some FAQ’s (Frequently Asked Questions).

1. What is my message centre number?
   
   For customers on the Pay & GoT Original, Pay & GoT Talkalot, Pay & GoT Wild and O2 Online Pay & GoT tariffs, your message centre number is +447802092035.For all other O2 customers, including U, Easylife, Pay & GoT Free Best Friend and all Pay Monthly tariffs, your message centre number is +447802000332. This option is normally found in your ‘Messages’ menu and then look for ‘Settings’ then ‘Message Centre Number’. However for a detailed step-by-step guide please [1] click here and choose you mobile manfacturer.
2. Can I view my bills online?
   
   Yes, O2 have an online billing view system all you need to do is [2] click here and sign up to My O2.
   
3. How do I set up my Voicemail?Dial 901 from your mobile phone and listen to the voice prompts.
   
4. How do I check if O2 works in my area?O2 have a fantastic new tool which enables you to enter your postcode or town and view live data about the service within your area before buying a handset. [3] Click here now to access O2’s Coverage Map including HSDPA and future coverage maps.
   
5. How do I set up MMS/Picture Messaging/E-mail/GPRS?Please [4] Click here to access O2’s GPRS and Media Messaging (Picture Messaging) set-up service. Otherwise, please read below:Normally when you insert your SIM card into a handset O2’s systems recongise this and automatically send you the settings, however should this not happen please try the following:If you’re a Pay Monthly customer you can either: Contact your service provider using the number on your billGet sent the settings via a text messageIf you’re a Pay & GoT customer you can:

   Text “PICON” to 21400, to enable the service. You will then receive a series of text messages, with instructions to set your phone up.

   Send a Media Message

   Take a picture or video using the camera function on your mobile phone. Add text or a sound clip if you want to, then send it to:

   Another camera phone The recipient will get the message on their mobile phone

   A non-Media Messaging mobile phone The recipient will get a text message asking them to view the message on their operator’s website

   An email address The recipient will pick up the Media Message in their email

   Your own storage area on the O2 website Send the message to 6001 and it will be sent to your Stored Messages online. To access this, go to www.o2.co.uk, sign in and click on the Kodak tab and register your details to manage your Messages.

6. Where can I upgrade my phone?You can Upgrade your mobile phone from any of these places - [5] O2, [6] Phones 4U, [7] The Carphone Warehouse. All the above stores have stores up and down to country, please select which one is most convenient for you. We have our own mobile upgrades team available [8] Click here
   
7. How do I contact O2?Please read below for O2’s contact details, please ensure that you have your mobile number and security answers readyPay & GoT Customer Service details:From a landline and mobile - 08705 678 678, from your mobile 4445 chargeable at 25p per call. To top up call 4444 directly from your phone for free or call 0845 606 2277 from a landline or mobile - charged at national rates.Customer services is open 7:00am - 10:00pm Monday to Friday and 8:00am - 8:00pm at weekends.Pay Monthly Customer Service details:

   If you purchased your mobile from an O2 store please call 0870 241 0202 or 202 from your mobile Our phone service is open 8:00am - 8:00pm Monday to Friday and 9:00am - 6:00pm at weekends. Calls made from an O2 Pay monthly mobile are free both in the UK and aboard.

   If you purchased your mobile through O2.co.uk or by phone please call 0870 600 3009 Our phone service is open 8:00am - 9:00pm Monday to Friday and 8:00am - 8:00pm at weekends.

   Business Customer Service details:

   From the handset dial 8002 - free from your O2 mobile or 0800 977 7027 - free from a landline

   Business Customer Services 0800 977 7337 from a landline

   Online Business Customer Services 0800 977 7027

   Business Customer Services is open from 7:00am - 11:00pm Monday to Friday and 8:00am - 10:00pm at weekends.

   If you purchased your O2 phone from The Carphone Warehouse please dial - 08705 678 678 or 0870 111 7200.

8. How do you set up roaming and what is it?Roaming allows you to go to abroad and still use you mobile phone using the same mobile number. You many need to activate your roaming service and this can be done by caling Customer Services. O2 offer excellent add-on called International Traveller Service which make calling aboard cheaper, [9] click here to find out how much it will cost to use your mobile phone aboard.
   
9. How do I change my tariff?You can change your tariff to a more suitable tariff by by calling Customer Services.
   
10. Where can I get exclusive offers from O2?[10] Click here for more information about O2’s exclusive offers!