O2 SIM only: the best deals in February 2025

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Find out which choices on O2's SIM only came top of our comparisons against every other UK network this month. Last updated: 13th February 2025.
O2's best SIM only deals
This month's overall best O2 SIM only deal

just
£10
a month
✔ Unlimited mins and 50GB data See full deal
at o2.co.uk
(opens in new window)
We'd say the best SIM only plan O2 are selling this February is their discounted 12‑month 50GB deal below, which comes in at £24 £10 a month and includes unlimited minutes and texts too:

Unlimited minutes + Unlimited texts + £24 £10 a month (12‑month contract)
See full deal
That means a total saving of £168 when you add up the £14 discount over 12 months.
It's not actually the cheapest SIM only deal on the market at the moment with 50GB data or more but it is the lowest-priced plan on any provider using the O2 network. Here are other networks you can beat it on:

Unlimited minutes + Unlimited texts + 50GB 60GB data (5G) = £7.95 a month (1‑month contract)
See full deal

Unlimited minutes + Unlimited texts + 40GB 80GB data (5G) = £10 £8 a month for 15 months, then £10 (1‑month plan, no contract)
See full deal

Unlimited minutes + Unlimited texts +
See full deal

Unlimited minutes + Unlimited texts +
See full deal

Unlimited minutes + Unlimited texts +
See full deal

Unlimited minutes + Unlimited texts + £17 £9.99 a month (12‑month contract)
See full deal

Unlimited minutes + Unlimited texts + 20GB 60GB data (5G) = £10 a month (1‑month plan, no contract)
See full deal

Unlimited minutes + Unlimited texts + 25GB 60GB data (5G) = £16 £10 a month (12‑month contract)
See full deal
O2's £7.99 for 30GB is our next best choice now

just
£7.99
a month
✔ Unlimited mins and 30GB data See full deal
at o2.co.uk
(opens in new window)
For people who don't need that much data, O2 are also offering this discounted £22 £7.99 SIM, which includes 30GB data, unlimited minutes and texts on a 12‑month plan. It's another of their best deals:

Unlimited minutes + Unlimited texts + £22 £7.99 a month (12‑month contract)
See full deal
In total, that discount of £14.01 a month means you’re looking at a saving of £168.12 over the 12‑month deal.
You can beat it for price if you don't need your SIM to be with a provider using the O2 network. But if that's a must, then it is the lowest-cost SIM with 30GB data or more. See the networks with cheaper plans here:

Unlimited minutes + Unlimited texts +
See full deal

Unlimited minutes + Unlimited texts +
See full deal

Unlimited minutes + Unlimited texts + 25GB 30GB data (5G) = £16 £7 a month (12‑month contract)
See full deal
Their £6.99 SIM with 6GB is our next favourite this February

just
£6.99
a month
✔ Unlimited mins and 6GB data See full deal
at o2.co.uk
(opens in new window)
If that'd be too much data for you, you might like the discounted £20 £6.99 SIM only deal running on O2 at the moment. It's a 12‑month plan, which comes with 6GB data, unlimited minutes and texts too:

Unlimited minutes + Unlimited texts + £20 £6.99 a month (12‑month contract)
See full deal
Getting £13.01 off a month means you’ll save £156.12 over the course of your 12‑month deal.
It's currently the best priced 6GB data or more SIM only deal on a provider using the O2 network, even if you can beat it on price if you're open to ones not on O2. Here's which other networks can beat it:

Unlimited minutes + Unlimited texts + £5 £2.50 a month for 1 month, then £5 (12‑month contract)
See full deal

Unlimited minutes + Unlimited texts + 6GB 8GB data (5G) = £5.95 a month (1‑month contract)
See full deal

Unlimited minutes + Unlimited texts + £14 £5.99 a month (12‑month contract)
See full deal
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How O2's deals compare with other networks

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More about O2's SIM only plans
O2’s SIM only prices and benefits compared
In our full review of the O2 network we said we liked their brilliant call signal (3G/2G) coverage, their good 5G coverage and their great WiFi hotspot scheme. We also like their WiFi calling and 4G calling.
You have the choice of 1-month, 12-month and 24-month contracts. Their 24-month contracts are usually much cheaper per month, but it’s best to check their current deals for the best possible offer.
O2’s deals tend to be some of the most expensive of all networks, but they’re a bit more competitive on big data deals. There are some smaller providers on O2’s network who offer better value SIM only deals.
They’re also the only main UK network to still offer inclusive EU roaming on all plans. And you can get extras on premium plans, such as subscriptions to entertainment services and worldwide roaming data passes.
Useful link: Read our full O2 review
Other things to know about O2’s SIM only deals
You’ll get your O2 SIM card between 1-4 working days after ordering (depends on your location). And there are premium delivery options too. You’ll receive each size of SIM for any phone. Or you can take an eSIM.
When your SIM arrives, you have 14 days to return it and get a full refund if you’re not satisfied. This will also cancel your contract. Here’s how you do that.
To prevent customers racking up huge bills they can’t pay, O2 make you pass a credit check to join them. If you have a poor or no credit history you can still join O2 on a PAYG monthly bundle instead.
And if you’re switching to O2 from another network you can keep your number by requesting a PAC from your old provider and giving it to O2 at any point. Here’s how you do that.
Useful link: Compare all O2 SIMs