O2 SIM only deals: comparing their best plans in October
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We look at whether O2's current best SIM only plans are decent value compared to all their competitor mobile networks in the UK. SIM Sherpa is your trusty guide. Last updated: 14th October 2024.
O2's best SIM only deals
The best value SIM only deal on O2 this month
just
£23
a month
✔ Unlimited mins and 250GB data See full deal
at o2.co.uk
(opens in new window)
From all the options O2 have got available this October on SIM only, we think this £23 24‑month deal is their best. For your £23 a month, you get 250GB data alongside unlimited minutes and texts:
Unlimited minutes + Unlimited texts + 250GB data (5G) = £25 £23 a month (24‑month contract)
See full deal
You can get a lower-priced SIM with 250GB data or more elsewhere if you don't need it to use the O2 network. But if you do need that, it is the cheapest deal available. See lower-priced networks' deals here:
Unlimited minutes + Unlimited texts + 250GB data (5G) = £13.95 a month (1‑month contract)
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Unlimited minutes + Unlimited texts + 250GB data (5G) = £14 a month (1‑month contract)
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Unlimited minutes + Unlimited texts + Unlimited data (5G) = £20 £15 a month (1‑month plan, no contract)
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🛈 No annual price rises
Unlimited minutes + Unlimited texts + Unlimited data (5G) = £25 £9.99 a month for 6 months, then £25 (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + Unlimited data (5G) = £27 £18 a month (12‑month contract)
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Unlimited minutes + Unlimited texts + Unlimited data (5G) = £26 a month (12‑month contract)
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Unlimited minutes + Unlimited texts + Unlimited data (3G) = £20 a month (1‑month plan, no contract)
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🛈 ASDA reserve the right to increase the cost of this plan annually with one month's notice
Unlimited minutes + Unlimited texts + 100GB 300GB data (5G) = £20 a month (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + Unlimited data (5G) = £22.50 a month (12‑month contract)
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Unlimited minutes + Unlimited texts + Unlimited data (5G) = £23 a month (24‑month contract)
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🛈 Prices rise each year on March 31st by £1.50
We also like their £20 for 100GB plan
just
£20
a month
✔ Unlimited mins and 100GB data See full deal
at o2.co.uk
(opens in new window)
For a smaller chunk of monthly data, we also think this £20 O2 SIM is one of their best options. It comes with 100GB data, unlimited minutes and texts on a 24‑month deal:
Unlimited minutes + Unlimited texts + 100GB data (5G) = £22 £20 a month (24‑month contract)
See full deal
It's definitely one of O2's best. But it's not market-leading. You can get a similar plan on other providers for less, even if you need your SIM to use the O2 network. Here are other networks you can beat it on:
Unlimited minutes + Unlimited texts + 120GB data (5G) = £14 a month (12‑month contract)
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Unlimited minutes + Unlimited texts + 150GB data (5G) = £11.95 a month (1‑month contract)
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Unlimited minutes + Unlimited texts + 150GB data (5G) = £12 a month (1‑month contract)
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Unlimited minutes + Unlimited texts + 120GB data (5G) = £18 £12 a month (12‑month contract)
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Unlimited minutes + Unlimited texts + 100GB data (5G) = £12 a month (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + 120GB data (5G) = £7.50 a month for 3 months, then £15 (12‑month contract)
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Unlimited minutes + Unlimited texts + 100GB data (5G) = £17.50 £14 a month (24‑month contract)
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🛈 No annual price rise for Clubcard holders
Unlimited minutes + Unlimited texts + 40GB 120GB data (5G) = £15 a month (18‑month contract)
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Unlimited minutes + Unlimited texts + 100GB data (5G) = £15 a month (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + Unlimited data (5G) = £25 £9.99 a month for 6 months, then £25 (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + Unlimited data (3G) = £20 a month (1‑month plan, no contract)
See full deal
🛈 ASDA reserve the right to increase the cost of this plan annually with one month's notice
Unlimited minutes + Unlimited texts + 100GB 300GB data (5G) = £20 a month (1‑month plan, no contract)
See full deal
Unlimited minutes + Unlimited texts + 100GB data (5G) = £20 a month (24‑month contract)
See full deal
🛈 Prices rise each year on March 31st by £1.50
Their 20GB for £17 SIM is another good option
just
£17
a month
✔ Unlimited mins and 20GB data See full deal
at o2.co.uk
(opens in new window)
If you don't need that much data, O2's £17 SIM below is another of their best deals this month. For £17 a month, it offers 20GB data, unlimited minutes and texts on a 24‑month plan:
Unlimited minutes + Unlimited texts + 20GB data (5G) = £19 £17 a month (24‑month contract)
See full 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 the networks with cheaper plans here:
Unlimited minutes + Unlimited texts + 15GB 30GB data (5G) = £6.95 a month (1‑month contract)
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Unlimited minutes + Unlimited texts + 30GB data (5G) = £7 a month (1‑month contract)
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Unlimited minutes + Unlimited texts + 21GB data (5G) = £7.90 a month (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + 40GB data (5G) = £16 £8 a month (12‑month contract)
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Unlimited minutes + Unlimited texts + 30GB data (4G) = £8 a month (12‑month contract)
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🛈 Annual Price Increase: monthly plan increases annually on 1 April by £1.00
Unlimited minutes + Unlimited texts + 20GB data (5G) = £10 £8 a month (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + 25GB data (5G) = £1.99 a month for 3 months, then £10 (12‑month contract)
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Unlimited minutes + Unlimited texts + 30GB data (5G) = £9.90 a month (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + 40GB 70GB data (5G) = £10 a month (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + 25GB 60GB data (5G) = £10 a month (18‑month contract)
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Unlimited minutes + Unlimited texts + 25GB data (5G) = £10 a month (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + 25GB data (5G) = £16 £10 a month (12‑month contract)
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Unlimited minutes + Unlimited texts + 20GB data (5G) = £10 a month (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + 30GB data (5G) = £12.50 a month (24‑month contract)
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🛈 Monthly price will increase each April by the Consumer Price Index rate of inflation published in January + 3.9%
Unlimited minutes + Unlimited texts + 10GB 30GB data (5G) = £13 a month (1‑month contract)
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Unlimited minutes + Unlimited texts + 25GB data (5G) = £15 a month (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + 25GB data (5G) = £16 a month (24‑month contract)
See full deal
🛈 Prices rise each year on March 31st by £1.50
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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