O2 Top Up

O2 e-voucher 10
£ 10.00O2 e-voucher £10
Direct delivery

O2 e-voucher 15
£ 15.00O2 e-voucher £15
Direct delivery

O2 e-voucher 20
£ 20.00O2 e-voucher £20
Direct delivery

O2 e-voucher 25
£ 25.00O2 e-voucher £25
Direct delivery

O2 e-voucher 30
£ 30.00O2 e-voucher £30
Direct delivery

O2 e-voucher 50
£ 50.00O2 e-voucher £50
Direct delivery


O2 Top Up

O2 is the UK’s largest mobile network provider, running its own infrastructure. It offers a wide range of flexible plans - from short-term to long-term, with a variety of benefits included.  If you want to stay flexible, you can go for a pay-as-you-go O2 SIM, or choose the Essential plan. Should your needs grow, you can always switch to a different tariff to meet them. O2’s flexibility and excellent coverage make it a smart choice for anyone looking to get the best connectivity on a budget. It’s also useful for students or temporary UK residents who want to stay connected without signing a long-term contract. 

O2’s top benefits:

If you’re considering a switch to O2, make sure to consider its key benefits, including:
  • Flexibility: Choose from short-term plans, long-term plans, or prepaid SIMs.
  • O2 rewards: For prepaid users, you can get up to 10% of your top-up credit back in the form of minutes, text, or data allowances.
  • Reliable coverage: O2 runs on its own network, giving you strong, consistent service. 
  • EU roaming included: All O2 plans include free EU roaming. 
  • Easy top-ups: Topping up O2 credit is easy and convenient, with plenty of options - both online and offline.  

What can you use O2 for?

O2 is great for affordable calling, texting, and mobile data use, whether you want a long-term contract or prefer to stay flexible. You can use your O2 SIM both in the UK and internationally. All plans include free EU roaming to make your travels hassle-free.  Because of its flexibility and extra rewards, O2 can be used as an excellent tool to manage your monthly budget, without compromising your connectivity. 

O2 use cases

Type of mobile userDescriptionHow O2 can help
Light userYou only use your phone occasionally, and prefer not to pay for allowances you don’t use.A prepaid O2 SIM is the best choice for light mobile users. You can buy an O2 voucher easily online when you need it - no commitments.
Heavy userYou use your phone often and want the best deal.A 24-month plan may offer you the best value. It’s also worth checking all prepaid plans O2 offers, as some of them include generous mobile data and minutes allowances, while keeping you flexible.
TravelerYou often travel outside the UK and want to keep using your phone.Free EU roaming is included in all O2 plans. 
International callerYou often call friends or family abroad, and want to keep your costs in check.Most of O2’s prepaid SIM plans include international minutes to over 42 countries. 
Frequently Asked Questions

Where can I buy O2?

The easiest and fastest way to top up O2 is online, at mobiletopup.co.uk. Other places to buy an O2 voucher also include multiple physical shops around the UK.

How to top up O2?

You’re in the right place for that! Just follow these steps:
  • Select a top-up amount above;
  • Fill in your email address (this is where you’ll receive your top-up code);
  • Select a payment method - you can choose from credit card, debit card, GooglePay, or PayPal;
  • Payment complete? Check your inbox to get your top-up code.
To redeem your new call credit, simply 4444 from your O2 phone and follow the instructions. 

Can I top up O2 for someone?

Yes! During your online O2 top-up, just enter the other person’s email instead of yours. They’ll get the top-up code directly in their inbox. 

Can I top up O2 from abroad?

Yes! You can top up O2 credit from anywhere via Mobiletopup.co.uk. Just make sure it’s for an O2 UK SIM - top-ups won’t work with SIM cards from other countries.

How can I check my O2 balance?

Simply dial 4444 from your O2 phone, or enter *#10# and press the call button. 

What is an O2 top up phone?

Simply, a phone using a prepaid SIM card from O2. You can top it up anytime you need to. Simply buy an O2 voucher and you’ll be ready to call or text. 

How can I top up my O2 data credit?

You can buy an O2 voucher and start browsing right away. All O2 prepaid plans contain a mobile data allowance. 

How do I set up my O2 data?

If you’re having trouble connecting to the internet with your device, you may need to manually install the O2 APN settings. Depending on your mobile phone, the process to follow may differ. You will find the most relevant instructions to set up your O2 data on the O2 help page
Instant code delivery by email
Safe & secure payment
Certified reseller
Payment methods
Logo
At Mobiletopup.co.uk it's not only possible to top up phone credit for several providers within 30 seconds, you can also purchase game vouchers and entertainment vouchers. The checkout process is safe and reliable. After a successful payment, you will immediately receive an email or text containing your voucher code.
Why do game stores ask for my phone number or address?Game store loyalty programs, promotions and customer service – why stores ask fo...
Read more2025-09-05

Can game companies track what I do online?Gaming companies may be tracking your online activity – learn how and why they d...
Read more2025-08-29

Is it safe to link my credit card to my gaming account?Wondering if linking your credit card to your gaming account is safe? Discover t...
Read more2025-08-22

Read all