Best O2 SIM deals: 80GB for £10, 50GB for £8
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We've checked through all the SIM only plans available on O2 this month to find which stack up best against the competition. Last updated: 15th September 2026.
O2's best SIM only deals
Our favourite SIM only deal this month on O2
just
£10
a month
✔ Unlimited mins and 80GB data See full deal
at o2.co.uk
(opens in new window)
We think O2's best value option on SIM only this September is their discounted £10 a month plan below, which comes with 80GB data, plus unlimited minutes and texts on a 12‑month deal:
Even though it's in our pick of O2's best SIM only deals, you can actually beat it on price with other providers, including ones that also use the O2 network. See lower-priced networks' deals here:
Their £8 for 50GB plan is a decent deal for September
just
£8
a month
✔ Unlimited mins and 50GB data See full deal
at o2.co.uk
(opens in new window)
If you don't want so much data, O2 are also offering this discounted £8 SIM, which includes 50GB data, unlimited minutes and texts on a 12‑month plan. It's another of their best deals:
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 are other networks you can beat it on:
They're also offering 10GB for £7 on SIM only currently
just
£7
a month
✔ Unlimited mins and 10GB data See full deal
at o2.co.uk
(opens in new window)
For people who don't need that much data, you might like the discounted £7 SIM only deal running on O2 at the moment. It's a 12‑month plan, which comes with 10GB data, unlimited minutes and texts too:
It's a good enough deal to get into O2's best SIMs but you can actually get a lower price for a similar plan elsewhere, even if you definitely want it to use the O2 network. See the networks with cheaper plans here:
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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