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O2 SIM only deals: comparing their best plans in February

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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: 26th February 2024.

O2's best SIM only deals

Our highest-rated SIM only deal on O2 this month

O2 SIM only deal
SIM only
just
£32.99
a month
🛈 Monthly price will increase each April by the Retail Price Index rate of inflation published in February + 3.9%

Unlimited mins and unlimited data See full deal

at o2.co.uk
(opens in new window)

Out of all the SIM only plans available this February on O2, we'd say their best value deal is their 24‑month SIM below, which gets you unlimited data, plus unlimited minutes and texts for £32.99 a month:

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:

Vodafone logo

Unlimited minutes + Unlimited texts + 0MB Unlimited data (5G) = £0 £26 a month (12‑month contract)
£100 Currys gift card (automatic, no need to claim)
See full deal

🛈 Monthly price + out of bundle charges will increase every April by the Consumer Price Index rate of inflation + 3.9%
ASDA Mobile logo

Unlimited minutes + Unlimited texts + 0MB Unlimited data (3G) = £0 £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
Three logo

Unlimited minutes + Unlimited texts + 0MB Unlimited data (5G) = £22 £20 a month (24‑month contract)
See full deal

🛈 Monthly price will increase each April by the Consumer Price Index rate of inflation published in December + 3.9%

They've also got a 150GB for £23.99 SIM plan at the moment

O2 SIM only deal
SIM only
just
£23.99
a month
🛈 Monthly price will increase each April by the Retail Price Index rate of inflation published in February + 3.9%

Unlimited mins and 150GB data See full deal

at o2.co.uk
(opens in new window)

For a smaller amount of data, another option for you on O2, is their 24‑month SIM below, which costs £23.99 a month for 150GB data and comes with unlimited minutes and texts:

It does enough to get into our pick of O2's best SIMs but that doesn't mean it's unbeatable on price. Other providers (even ones that use the O2 network) can beat it. See the networks that beat it here:

O2's £26 for 250GB is our next best choice now

O2 SIM only deal
SIM only
just
£26
a month
🛈 Monthly price will increase each April by the Retail Price Index rate of inflation published in February + 3.9%

Unlimited mins and 250GB data See full deal

at o2.co.uk
(opens in new window)

For people who need more data, O2 have got a £26 deal on SIM only we think's worth looking at. It gets you 250GB data, unlimited minutes and texts and it's a 24‑month plan:

O2 logo

Unlimited minutes + Unlimited texts + 0MB 250GB data (5G) = £0 £26 a month (24‑month contract)
See full deal

🛈 Monthly price will increase each April by the Retail Price Index rate of inflation published in February + 3.9%

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 the networks where it'd cost less:

Vodafone logo

Unlimited minutes + Unlimited texts + 0MB Unlimited data (5G) = £0 £26 a month (12‑month contract)
£100 Currys gift card (automatic, no need to claim)
See full deal

🛈 Monthly price + out of bundle charges will increase every April by the Consumer Price Index rate of inflation + 3.9%
ASDA Mobile logo

Unlimited minutes + Unlimited texts + 0MB Unlimited data (3G) = £0 £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
Three logo

Unlimited minutes + Unlimited texts + 0MB Unlimited data (5G) = £22 £20 a month (24‑month contract)
See full deal

🛈 Monthly price will increase each April by the Consumer Price Index rate of inflation published in December + 3.9%

Compare all SIM only plans

Compare deals from all networks

How O2's deals compare with other networks

SIM card with magnifying glass

Networks

Providers:

1p Mobile logo
Three logo
ASDA logo
Boshhh Mobile logo
Coop Mobile logo
EE logo
Genius logo
giffgaff logo
Honest logo
ID logo
IQ logo
Lebara logo
Lycamobile logo
O2 logo
SMARTY logo
Sky logo
spusu logo
Talkhome logo
Talkmobile logo
Tesco logo
Vodafone logo
VOXI logo

Plan

Data: (0MB+)

Minutes: (0+)

Contract

Maximum length: (Any)

Added features

More about O2's SIM only plans

O2’s SIM only prices and benefits compared

Rating stars and O2 logo

What we generally think about O2Read our full review

at simsherpa.com
(opens in new window)

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

O2 coverage checker screenshot

Check signal before you buy your planCheck yours now

at O2.co.uk
(opens in new window)

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

Other O2 guides