O2 SIM only deals: 12GB for £6.99, 50GB for £8.50
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We've looked at SIM only on all UK networks to help you find out which of O2's plans work out best, for every data requirement. Last updated: 31st October 2025.
O2's best SIM only deals
The best overall O2 SIM only deal this month
just
£6.99
a month
✔ Unlimited mins and 12GB data See full deal
at o2.co.uk
(opens in new window)
We think O2's best value option on SIM only this October is their discounted £6.99 a month plan below, which comes with 12GB data, plus unlimited minutes and texts on a 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 12GB data or more. See the networks with cheaper plans here:
O2's 50GB for £8.50 plan is a good option too
just
£8.50
a month
✔ Unlimited mins and 50GB data See full deal
at o2.co.uk
(opens in new window)
If you need more data, the next best SIM only plan on O2 in our opinion is their discounted 12‑month one below. For £8.50 a month, you get 50GB data, plus unlimited minutes and texts:
It's currently the best priced 50GB 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:
Their £10 for 80GB plan is a decent deal for October
just
£10
a month
✔ Unlimited mins and 80GB data See full deal
at o2.co.uk
(opens in new window)
For even more monthly data, another good deal on O2 at the moment is their discounted £10 SIM only plan here, which includes 80GB data instead, plus unlimited minutes and texts:
It's actually possible to beat this deal if you're not fussed whether your SIM is with a provider using the O2 network. But if you are, it is the current best-priced option. See where you can get it for less here:
They're also offering 250GB for £15 on SIM only currently
just
£15
a month
✔ Unlimited mins and 250GB data See full deal
at o2.co.uk
(opens in new window)
To get even more data, our next best pick of O2 SIM only plans is their discounted 12‑month £15 deal below, which gets you 250GB data and unlimited minutes and texts:
In comparison to the rest of O2's current SIM only plans, it's one of the best. But it is beatable on price, even if you're set on joining a provider that uses the O2 network. Here are the networks offering it cheaper:
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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