O2 SIM only deals: comparing their best plans in September
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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: 10th September 2024.
O2's best SIM only deals
Our best-rated O2 SIM only deal this month
just
£26
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 September on SIM only, we think this £26 24‑month deal is their best. For your £26 a month, you get 250GB data alongside unlimited minutes and texts:
Unlimited minutes + Unlimited texts + 250GB data (5G) = £13 a month for 6 months, then £26 (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 who's offering it for less here:
Unlimited minutes + Unlimited texts + 250GB data (5G) = £13.95 a month (1‑month contract)
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Unlimited minutes + Unlimited texts + 300GB data (5G) = £14 a month (24‑month contract)
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Unlimited minutes + Unlimited texts + Unlimited data (5G) = £20 £16 a month (1‑month plan, no contract)
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🛈 No annual price rises
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 + Unlimited data (5G) = £22 a month (24‑month contract)
See full deal
Their 150GB for £23.99 SIM is another good option
just
£23.99
a month
✔ Unlimited mins and 150GB data See full deal
at o2.co.uk
(opens in new window)
If you need less data, another good deal on O2 at the moment is their £23.99 SIM only plan here, which includes 150GB data instead, plus unlimited minutes and texts:
Unlimited minutes + Unlimited texts + 150GB data (5G) = £11.99 a month for 6 months, then £23.99 (24‑month contract)
See full deal
It's not actually the cheapest SIM only deal on the market at the moment with 150GB data or more but it is the lowest-priced plan on any provider using the O2 network. Here's where you can beat it on other networks:
Unlimited minutes + Unlimited texts + 150GB data (5G) = £6 a month for 6 months, then £12 (24‑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 180GB data (5G) = £15 a month (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + 200GB data (5G) = £18 a month (1‑month plan, no 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)
See full deal
🛈 ASDA reserve the right to increase the cost of this plan annually with one month's notice
O2's 30GB for £20.99 plan is a good option too
just
£20.99
a month
✔ Unlimited mins and 30GB data See full deal
at o2.co.uk
(opens in new window)
For a smaller amount of data, our next best pick of O2 SIM only plans is their 24‑month £20.99 deal below, which gets you 30GB data and unlimited minutes and texts:
Unlimited minutes + Unlimited texts + 30GB data (5G) = £10.49 a month for 6 months, then £20.99 (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 lower-priced networks' deals 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 + 40GB data (5G) = £5 a month for 3 months, then £10 (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + 40GB 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 + 30GB data (5G) = £16 £8 a month (12‑month contract)
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Unlimited minutes + Unlimited texts + 30GB data (5G) = £9 a month (1‑month plan, no 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 + 20GB 45GB data (5G) = £10 a month (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + 60GB data (5G) = £12 a month (12‑month contract)
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Unlimited minutes + Unlimited texts + 50GB data (5G) = £12.50 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 + 15GB 45GB data (5G) = £14 a month (12‑month contract)
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Unlimited minutes + Unlimited texts + 40GB data (5G) = £15 a month (18‑month contract)
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Unlimited minutes + Unlimited texts + 25GB 30GB data (5G) = £25 £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