O2 SIM only deals: comparing their best plans in March
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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: 29th March 2024.
O2's best SIM only deals
This month's best SIM only deal on O2
just
£32.99
a month
✔ Unlimited mins and unlimited data See full deal
at o2.co.uk
(opens in new window)
Looking at what you can get on SIM only with O2 this March, our best-rated deal would be their 24‑month plan below, which comes with unlimited data, plus unlimited minutes and texts for £32.99 a month:
Unlimited minutes + Unlimited texts +
See full deal
Compared to O2's other deals, this comes out among the best. But it's worth knowing you can get a lower price elsewhere, even on other providers that use the O2 network. Here are other networks you can beat it on:
Unlimited minutes + Unlimited texts +
See full deal
🛈 No annual price rises
Unlimited minutes + Unlimited texts +
See full deal
Unlimited minutes + Unlimited texts +
See full deal
Unlimited minutes + Unlimited texts +
£100 Currys gift card (automatic, no need to claim)
See full deal
Unlimited minutes + Unlimited texts +
See full deal
Unlimited minutes + Unlimited texts +
See full deal
🛈 ASDA reserve the right to increase the cost of this plan annually with one month's notice
Unlimited minutes + Unlimited texts + £22 £20 a month (24‑month contract)
See full deal
Unlimited minutes + Unlimited texts +
See full deal
Unlimited minutes + Unlimited texts +
See full deal
🛈 Prices reduce over time!
Unlimited minutes + Unlimited texts + £35 £25 a month (18‑month contract)
See full deal
Unlimited minutes + Unlimited texts +
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Unlimited minutes + Unlimited texts +
See full deal
🛈 Monthly price will increase after March 31st each year by the Consumer Price Index rate of inflation published in December + 3.9%
Their £20.99 for 30GB plan is a decent deal for March
just
£20.99
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, we'd say this is one of O2's best deals on SIM only this month too. It's a 24‑month plan, comes with 30GB data, unlimited minutes and texts for £20.99 a month:
Unlimited minutes + Unlimited texts +
See full deal
It might be one of O2's best deals on SIM only but you can get a lower price for a similar plan on other providers, even ones that use the O2 network. See the networks with cheaper plans here:
Unlimited minutes + Unlimited texts +
See full deal
Unlimited minutes + Unlimited texts +
£25 Currys gift card (automatic, no need to claim)
See full deal
Unlimited minutes + Unlimited texts +
See full deal
Unlimited minutes + Unlimited texts +
See full deal
🛈 Lyca reserve the right to increase the cost of this plan annually with one month's notice
Unlimited minutes + Unlimited texts + £16 £8 a month (12‑month contract)
See full deal
Unlimited minutes + Unlimited texts + 20GB 30GB data (5G) = £9.90 a month (1‑month plan, no contract)
See full deal
Unlimited minutes + Unlimited texts + 40GB 60GB data (5G) = £10 a month (1‑month plan, no contract)
See full deal
Unlimited minutes + Unlimited texts + 15GB 30GB data (5G) = £10 a month (1‑month plan, no contract)
See full deal
Unlimited minutes + Unlimited texts +
See full deal
Unlimited minutes + Unlimited texts + 10GB 30GB data (5G) = £12 a month (12‑month contract)
See full deal
Unlimited minutes + Unlimited texts + £15 £13 a month (24‑month contract)
£20 Clubcard voucher (automatic, no need to claim)
See full deal
Unlimited minutes + Unlimited texts + £17 £13 a month (1‑month 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
They're also offering 150GB for £23.99 on SIM only currently
just
£23.99
a month
✔ Unlimited mins and 150GB data See full deal
at o2.co.uk
(opens in new window)
For more data, have a look at O2's 150GB SIM below at £23.99 a month, as it's another good deal. It's on a 24‑month plan and comes with 150GB data, unlimited minutes and texts:
Unlimited minutes + Unlimited texts +
See full deal
There are other networks charging less for a SIM with 150GB data or more but this is the best current option with a provider that uses O2. Here's which other networks can beat it:
Unlimited minutes + Unlimited texts +
£50 Currys gift card (automatic, no need to claim)
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 +
See full deal
Unlimited minutes + Unlimited texts +
See full deal
🛈 ASDA reserve the right to increase the cost of this plan annually with one month's notice
Unlimited minutes + Unlimited texts + £22 £20 a month (24‑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