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Compare O2 SIM only deals

If you’re looking for a new SIM deal, O2 has plenty to offer, including 5G speeds, priority tickets at O2 venues and inclusive EU roaming.

Uswitch tips

How do I switch and keep my number?
Thumbnail, graphic - SIM cards from different networks. Uswitch compares deals from Lebara Mobile, O2, iD Mobile, Three, Vodafone and others.

1. Choose your new deal
Select a deal below and click through to the network’s site.

2. Get your PAC code
You’ll need a special code to keep your number when you switch. It's quick and free:
Text PAC to 65075 to receive your code.

3. Give the code to your new network
Contact the new network after signing up to provide them with your PAC code, which will begin the process and will automatically cancel your previous plan. Alternatively, you can enter the PAC code when signing up on the network’s site.

List of SIM Only deals

Sorted by: Uswitch Promoted

  1. O2 SIM deal

    O2 logo

    £7.99 a monthMonthly cost will rise every April by inflation (RPI) plus 3.9%.

    12 month contract

    30 GBof 5G data

    • EU roaming included
    • O2 Priority Tickets
    • Best Network for Roaming
  2. O2 SIM deal

    O2 logo

    £10.00 a monthMonthly cost will rise every April by inflation (RPI) plus 3.9%.

    12 month contract

    50 GBof 5G data

    • EU roaming included
    • 3 months Free Amazon Prime
    • Best Network for Roaming
  3. O2 SIM deal

    O2 logo

    £6.99 a monthMonthly cost will rise every April by inflation (RPI) plus 3.9%.

    12 month contract

    6 GBof 5G data

    • EU roaming included
    • O2 Priority Tickets
    • Best Network for Roaming
  4. O2 SIM deal

    O2 logo

    £15.00 a monthMonthly cost will rise every April by inflation (RPI) plus 3.9%.

    12 month contract

    100 GBof 5G data

    • EU roaming included
    • 3 months Free Amazon Prime
    • Best Network for Roaming
  5. O2 SIM deal

    O2 logo

    £18.00 a monthMonthly cost will rise every April by inflation (RPI) plus 3.9%.

    12 month contract

    250 GBof 5G data

    • EU roaming included
    • 3 months Free Amazon Prime
    • Best Network for Roaming
Can't find what you're looking for?

Uswitch services are provided at no cost to you, but we may receive a commission from the companies we refer you to. If a deal is "promoted" on Uswitch's tables, then it has been lent additional visibility as a result of us securing exclusivity on a great deal, or a commercial agreement to showcase what we believe to be market-leading value to consumers. Learn more about how our site works.

Please note: Mobile networks may increase monthly prices in line with the retail or consumer price index each year during the length of your contract. Please refer to individual network's terms and conditions before signing up.

Author: Nick Baker | Last updated: 21st May 2024

How do I choose the best O2 SIM only deal for me? 

If you’re looking to switch networks, O2 is a fantastic choice. It delivers 97% 4G coverage across the UK and 5G in a growing number of locations. On top of this, it’s one of the only major networks that still offer EU roaming at no extra charge. It also has a fantastic rewards app with freebies, discounts, and priority tickets for events at O2 venues.

Once you’ve decided on signing up for an O2 SIM, the next thing you need to work out is how much data you need. Most O2 SIM deals come with unlimited calls and texts, so the biggest decision you need to make is how much data you think you’ll need and how much you want to pay per month.

Generally, an average smartphone user gets through roughly 5-10GB a month. This is typically enough to cover general use, like checking emails, sending WhatsApp messages and scrolling through social media.

However, data options can go well over 100GB and even to unlimited tariffs. Prices will often go up the higher the cap goes, though.

Much of what you decide depends on how much time you spend connected to Wi-Fi at home or work. So, if you’re on the move a lot, you might want to consider signing up for a larger data plan.

If you’d like to find out how much data you use in a month, check your network’s app. There, you’ll find a monthly breakdown of your usage.

Why choose an O2 SIM only deal?

  • Named most Popular Mobile Network in 2023: O2 won our Uswitch award for the Most Popular Network in 2023 thanks to its excellent coverage, generous roaming policy and impressive perks and benefits.

  • Excellent coverage: O2 delivers fast 4G coverage to 97% of the UK and has a fast 5G network that spans a growing number of towns and cities around the country. So, you should be able to enjoy fast speeds from almost anywhere in the UK.

  • Inclusive EU roaming: O2 is one of the only networks in the country that has chosen not to reintroduce roaming charges for travel to EU countries after Brexit. This means that if you’re on O2, you can continue using your regular allowance of calls, texts, and data at no extra cost while in any EU country.

  • O2 Priority: O2 is famous for its O2 Priority app, which allows users to buy tickets for events at O2 venues before they go on general sale. The app also offers regular competitions, special offers, and freebies for its customers to enjoy.

What SIM only deals does O2 offer?

O2 offers a wide range of SIM only deals, from cheap SIM plans to big, unlimited data contracts. At the time of writing, O2 SIM only plans start from just £6 a month for 4GB of data, up to a 250GB data SIM for £18 a month.

At the time of writing, O2 currently offers SIMs to suit all needs, including:

  • Pay as you go

  • 5G SIM only deals

  • Cheap deals

O2 delivers 5G SIM only deals as standard now, with even its cheapest plans able to connect to 5G networks. However, you should bear in mind that your mobile phone also needs to be 5G-enabled for you to be able to take advantage of those faster speeds.

O2’s SIM only contract deals last 12 months, so you’ll be tied in for a year. Unless, of course, you opt for an O2 pay-as-you-go SIM, which means that you only pay for the usage you need. If you’re not planning to use your phone regularly, this might be a good option.

But if you plan on using it for regular calls, texts and internet use, you’d probably be better off signing up for a cheap O2 SIM deal.

What length of contract is available on O2?

O2 SIM only deals usually last for 12 months. Alternatively, you could opt for an O2 pay-as-you-go SIM, although these can be more expensive if you use your phone regularly.

Want an O2 phone contract instead?

Take a look at our best pay monthly deals from O2 today.

Can I use my O2 SIM abroad?

Woman smiling and looking at mobile phone

Yes, you can use your O2 SIM abroad, although depending on your destination, it might cost you more. O2 won our Uswitch award for Best Network for International Roaming in 2022 because it was the only major UK network that didn’t reintroduce international roaming charges in EU countries after Brexit. 

This means you can use your monthly allowance for minutes, messages, and data without paying extra charges in any EU country.

If you’re travelling further afield, such as to the US, Canada or Australia, you can buy a bolt-on for an extra £6 a day.

To learn more, check out our guide on international roaming on O2.

How do I activate my SIM?

O2 makes it really easy to activate its SIM cards. If you’ve received a physical SIM card, it should be ready to go. All you need to do is pop it into your handset, and it should start working straight away. If it doesn’t, you may need to restart your device.

If you’ve got an eSIM, you’ll need to download the eSIM profile onto your device. To do this, scan the QR code included in your eSIM pack.

Can I keep my number with an O2 SIM only deal?

Yes, keeping your number is easy if you’re switching to an O2 SIM only deal. Text PAC to 65075 to receive your PAC code. Then, contact O2 and give them the code so they can transfer your new number for you.

You can call O2 on 034 4809 0222.

What happens at the end of an O2 SIM only contract?

Once your contract is nearing its end, you’ll receive an email or text message from O2. Once you’ve received this, you can access your O2 app and find upgrade options.

However, these aren’t generally the most competitive deals, and you should be able to find options that are much better value for money if you shop around. If you want to check out some options, compare our best SIM only deals on Uswitch.

Other networks

Is O2 not right for you? There are many UK networks with a range of products available. No matter your budget, data requirements, or handset preference, you’ll be able to find the ideal package: 

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