Mars 2021 —

O2 online: top up credit and data online in 1mn!

Do you have an O2 sim card and you need a quick top-up for credit and data? Are you also looking for a phone deal? You can do all this using O2 online! 

In this article, you will see how to top-up your mobile online, what is the best way to reach the O2 online customer service, how you can create an O2 online account and how to top up an O2 phone. Enjoy! 

O2 Mobile online presentation

O2 online: find data
O2 online

O2 Mobile (previously Cellnet) is the second largest telecommunications services provider in the UK, after EE. 

Officially formed in 1985 with headquarters in Slough, England, O2 was originally created as a joint venture between BT Group and Securidor. However, O2 was bought in 2006 and is now owned by the Telefonica group, a Spanish multinational telecommunications company. O2 UK is officially incorporated as Telefonica UK Ltd., however, the owner decided to keep the brand as O2. The company also has two subsidiaries: Giffgaff and 50% of Tesco Mobile. 

O2 has over 10.000 employees and owns over 450 retail stores across Great Britain and Northern Ireland. 

O2 online: how it works

O2 has over 23 million satisfied customers, which makes it easy to understand why the brand is in the top 3 preferred telecommunications services. O2 runs 2G, 3G, 4G and 5G networks across the UK, as well as operating O2 Wifi. On top of that, O2 Mobile also provides mobile broadband services, Sim Only deals, phone contracts and more. 

O2 online phone deals

Are you looking for a new phone? Well, look no further O2 online has the best phone deals you can find! Everything you need is just a couple of clicks. 

Here are a few details about the O2 mobile phone deals: 

  • There are 10 brands from which you can choose, totaling almost 70 devices. Whether you’re more of an Apple enthusiast or a Samsung fan, you will definitely find the phone you want. Some models from brands such as LG, Huawei, Sony, Doro etc. are also available. 
  • Monthly costs for O2 mobile devices range from £40 to £97. You can also choose to buy from the over 40 reconditioned devices, with monthly costs starting at £20. 
  • There are two types of plans for O2 mobile phones: Pay Monthly or Pay as Go. On the Pay Monthly deal, you can choose a pre-built plan or customise your own, depending on how much you are willing to pay upfront and how much you want to leave for monthly installments. 
  • Choose from the filters available on the website to customize your phone. From the most basic deals to the newest models, compatible with 5G frequencies, you can find a great mobile device for your needs. 

O2 online: how can I top up my phone?

O2 online: recharge a phone
O2 online

Now that you have a new phone, you still need to top-up your sim card so you can use your device! You can do so by using O2 internet.  

Don’t forget you can also use Monisnap (ex Allo), for a quick top-up, easy and secure. 

There are two ways in which you can top-up your O2 mobile online: 

O2 online web top-up: 

  • Top up between £10 and £30 online. 
  • Choose the number you wish to top-up and pay by credit or debit card. 
  • You can only pay with a card from a UK bank and registered to a UK address

O2 auto top-up: 

  • Login to your My O2 account
  • Choose the amount you want to be topped on your mobile at a certain date or when you run out of credit
  • Input your credit or debit card
  • O2 Mobile automatically tops-up your phone and the payment will appear on your card 

If you have not done so already, create your O2 online account and enjoy all the perks that come with it. See how you can login just below. 

O2 online account: login

Simplify your access to your O2 online account by logging into My O2. You can use My O2 from your browser or your phone app, available on Google Play and Apple Store. 

Using MY O2 is easy. In order to login, create an account by following these steps: 

  • input your personal details: name, phone number, email address 
  • pick a password and validate your account on your email address  
  • connect your account 

Once you have followed these instructions, you will be able to log into your account using your email and password. With My O2, you can check your usage and remaining balance, set-up auto top-ups and manage your account. Login today! 

O2 online support: reach the customer service

Do you want to reach O2 Customer Service online support? Unfortunately, O2 Mobile online does not provide an email address or an online form that you can use. 

However, you can contact O2 online by chat 

  • Use the virtual assistant, Aura, on the Contact Us Homepage. 
  • Type down your questions and you will be redirected to the pages concerning your issue 

Don’t forget to check their Help page before reaching for Customer Service, you may find the answer there and save you a lot of time. 

You can also contact O2 online by phone. See how in the FAQ section below. 

Top up online in 1mn with Monisnap (ex Allo)

Top-up-online-in-1mn-with-Allo-by-Monisnap

Do you want to top up a friend’s phone number in just one minute? Use Monisnap (ex Allo)!  

You can purchase O2 top up card, mobile top-ups for call credit or mobile data at the exact same fares that you find on O2. 

Here’s how it works: 

  • choose the mobile and the amount you wish to top-up 
  • pay securely on our platform using your Visa or Mastercard 
  • enjoy your instantly credited top-up 

As a bonus, for each top-up, mobile or data, you earn one loyalty star. Four stars equal one top-up with zero fees.

Use Monisnap (ex Allo): fast, easy and secure! 

📞 How can I contact the O2 customer service by phone?

Reach the O2 Customer Service by phone. All numbers are available between 8am and 9pm from Monday to Friday or 8 am to 6pm on Saturdays and Sundays. Here are the numbers you can use to call them: 


  • For your Pay Monthly service, call 222 from your O2 Mobile

  • Four your Pay as you Go service, 4445 from your O2 Mobile

  • If you are using a landline, cal 0344 8090222 

  • Call +44 7860 980 202 from abroad 

🚨 How can I get my O2 SIM?

To get your O2 SIM, follow this process:


  •       Choose your free SIM on the “Pay as you go” section of O2 website

  •       Wait 1-2 working days for the delivery


You’ll just have to top up your phone and it’ll be done.

🌍 In which countries is O2 mobile available?

O2 mobile is only present in Great Britain and Northern Ireland.

🚀 Can I top up my phone abroad?

Prepaid plans can be recharged from anywhere, as long as you have an UK registered credit or debit card. With Monisnap (ex Allo), you can also top up your phone from anywhere using any Visa or Mastercard. 

🧭 Can I find the same O2 mobile top-up plans on Monisnap (ex Allo) as on their website?

Exactly! With Monisnap (ex Allo), all the O2 Mobile prepaid plans are available! You can visit our website to discover the offers: clear and easy to understand. Data, texts, calls: all that you need is available and affordable with Monisnap (ex Allo)!

Yannis Rahal


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