By O2 is offering SIM-only deals like 40GB for £8 and 75GB for £10. Their deals come with inclusive EU roaming (up to 25GB), Priority offers, 5G, Volt benefits (if eligible), and more.
O2 is one of the UK’s largest mobile networks, with more than 15 million customers on their network.
When you choose an O2 mobile plan, you’ll get inclusive EU roaming (up to 25GB per month), along with O2 Priority offers and access to O2’s 5G network. There are also Volt customer benefits (which are unlocked if you’re also a Virgin Media customer), as well as an ‘O2 Satellite’ service (available with a bolt-on).
At present, there are a range of exclusive SIM-only deals available from O2, such as 40GB data for £8, 75GB data for £10, and 100GB data for £12 per month. All of these are available on a 12-month contract.
In this article, we’ll look at O2’s best SIM-only deals, and the additional features that you’ll get included with your plan.
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Best O2 SIM Only Deals
If you’re looking for a low-cost SIM-only deal from O2, there are currently some special offers available including 40GB data for £8, 75GB data for £10, and 100GB data for £12 per month.
All of these deals are available on a 12-month contract, with inclusive EU roaming, access to O2 Priority offers, and more.
The following table shows O2’s best SIM-only deals in March 2026:
| Network | Data | Monthly Cost | |
|---|---|---|---|
| 10GB data | £7.00 per month 12 month contract Monthly cost rising to £9.50 on 1 Apr 2027 | See deal |
| 40GB data | £8.00 per month 12 month contract Monthly cost rising to £10.50 on 1 Apr 2027 | See deal |
| 50GB data | £9.00 per month 12 month contract Monthly cost rising to £11.50 on 1 Apr 2027 | See deal |
| 75GB data | £10.00 per month 12 month contract Monthly cost rising to £12.50 on 1 Apr 2027 | See deal |
| 100GB data | £12.00 per month 12 month contract Monthly cost rising to £14.50 on 1 Apr 2027 | See deal |
| 150GB data | £14.00 per month 12 month contract Monthly cost rising to £16.50 on 1 Apr 2027 | See deal |
| 250GB data | £15.00 per month 12 month contract Monthly cost rising to £17.50 on 1 Apr 2027 | See deal |
O2 Features
The following features are available on your O2 mobile plan:
- Inclusive EU Roaming: Use your minutes, texts and data (up to 25GB per month) at no extra cost in more than 40 European destinations.
- O2 Priority: Access to weekly discounts and offers, as well as pre-sale tickets for gigs and events.
- Volt: Extra benefits if you also have Virgin Media broadband, such as double data and more inclusive roaming destinations.
- 4G & 5G coverage: Access to 99% population coverage, with 5G and 5G+ coverage at no extra cost.
- O2 Satellite: The UK’s first satellite-to-mobile service, powered by Starlink (bolt on required).
- Airtime: Get money off your O2 bill, when you spend at 200+ retailers.
Inclusive EU Roaming
As of 2026, O2 is the only major UK mobile network to retain free EU roaming for all of their mobile customers. This means you’ll be able to use your minutes, texts and data at no extra cost (up to 25GB per month) in over 40 European destinations. In contrast, other UK mobile networks can charge you up to £2.59 extra each day for using your phone in Europe.
| EU Roaming: | Included on all O2 plans (Pay Monthly & Pay As You Go) |
|---|---|
| EU Destinations Included: |
|
| Fair Use Limit: | 25GB data per month |
| Other Destinations: | 27 additional destinations with O2 Travel Inclusive Zone (available for Volt and Plus plans customers) |
O2 Priority
As an O2 customer, you’ll get access to the O2 Priority app. This gives you weekly discounts and offers from numerous brands including Vue and Greggs. For instance, there’s a £1 drink or savoury treat available from Greggs every week.
On O2 Priority, you’ll also get pre-sale access to thousands of gigs and events across the UK, plus VIP access and benefits at O2 venues.
| Priority Benefits: |
|
|---|---|
| Example Priority Offers: |
|
| Offers Available On: | iPhone & Android |
Volt
As an O2 Pay Monthly mobile customer, you can unlock exclusive Volt benefits if your household has Virgin Media broadband. This gives you enhanced connectivity, both on your mobile and your home broadband.
On your mobile, you’ll get double data added at no extra cost (or you’ll get unlimited data if your base plan comes with 250GB data or more). In addition, you’ll get the O2 Travel Inclusive Zone added, allowing you to roam in a further 27 worldwide destinations at no extra cost. This includes the USA, Canada, Mexico, Australia, New Zealand, and more.
On your home broadband, you’ll get an upgrade to the next fastest available plan (e.g. Virgin Media’s M250 broadband instead of M125 broadband). You’ll also get WiFi Max for better WiFi coverage at home, with plug-in WiFi Pods available to boost your home’s WiFi coverage.
| Volt Eligibility: | Households with Virgin Media broadband and O2 Pay Monthly |
|---|---|
| Volt Benefits: |
|
4G & 5G Coverage
Your O2 SIM card gives you access to 99% population coverage across the UK. In addition, you’re able to access 5G coverage at no extra cost. This gives you faster download speeds on your phone, as long as you’re using a 5G-ready device in a 5G-enabled coverage area (currently 77% of the UK’s population).
O2’s newest 5G+ coverage (also known as 5G Standalone) is also available at no extra cost if you’re using a compatible device in a 5G+ coverage area. This is currently available in more than 700 UK towns and cities. It’s designed to give you a more reliable connection, particularly in busy locations, as well as a more consistent experience.
| 4G Coverage: | 99% UK coverage (check postcode) |
|---|---|
| 5G Coverage: | Offers faster speeds & less buffering Available to 77% of UK’s population |
| 5G+ Coverage: | ‘5G Standalone’ for better reliability & consistency Available in over 700 UK towns and cities |
| uSwitch Awards: | Best Mobile Network Coverage (2025 and 2026) |
O2 Satellite
As of 2026, O2 has become the first UK mobile network to offer satellite-to-mobile connectivity. This is a new technology that allows your mobile phone to connect directly to a satellite. It means you can stay connected even in the most remote parts of the UK, where a normal terrestrial mobile signal is not available.
O2’s new Satellite service is powered by Starlink and is available through a £3 per month ‘O2 Satellite Bolt On’ (included at no extra charge if you’re on an O2 Ultimate plan). It’s a must-have service if you’re exploring some of the more remote parts of the UK, as it allows you to send messages, access maps, check the weather, and more using satellite connectivity.
| O2 Satellite Bolt On: | £3 per month (or included on Ultimate plans) |
|---|---|
| Works On: | Samsung Galaxy S25, S26 and Z7 Series phones |
| Apps Supported: |
|
| Powered By: | Starlink (satellite-to-mobile connectivity) |
Airtime & O2 Extras
As an O2 customer, there are a range of other features that can help you to save on your mobile bill.
For instance, you can use the Airtime app to earn money off your O2 bill. To do this, you’ll just need to link your bank card to the app, and then spend as normal in more than 200 partner retailers.
In addition, you can pay for other subscriptions through your O2 mobile bill, such as Amazon Prime, TNT Sports and the Xbox Game Pass Ultimate. When you do this, you’ll get a discount on your airtime plan.
| Airtime: | Earn money off your O2 mobile bill when spending at 200+ retailers |
|---|---|
| O2 Extras: | Save when you add Amazon Prime, TNT Sports or Xbox Game Pass to your bill |
Francis Wood said:
A question, Ken. Can I put an O2 (or any other, I suppose) PAYG sim card in an iphone 6, or does Apple block this in some way?
Ken replied:
Hi Francis,
Thanks for your comment. Yes, you can put an PAYG SIM card in your iPhone. The only thing to watch out for is if you handset is locked, in which case it’ll only accept SIM cards from one network.
Hope this helps,
Ken
Francis Wood replied:
Many thanks for that – saves me a trip to an Apple Store!
derek taylor said:
what is your lowest tariff for payg phone calls and texts only
Ken replied:
Hi Derek,
Please see my in-depth comparison of Pay As You Go tariffs for more information. However, in short: the cheapest rates are from 1pMobile (1p/minute and 1p/text with coverage from EE, albeit with a £10 minimum top-up every 120 days). For a more mainstream provider, O2 and Three charge 3p/minute and 2p/text.
Hope this helps,
Ken