Three SIM only deals for March: how they compare on price
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We've taken each of Three's best SIM only plans this month and compared them on price with other UK networks. Here's what we found. SIM Sherpa is your trusty guide. Last updated: 18th March 2024.
Three's best SIM only deals
Our favourite SIM only deal this month on Three
just
£12
a month
✔ Unlimited mins and 120GB data See full deal
at three.co.uk
(opens in new window)
We think Three's best value option on SIM only this March is their £12 a month plan below, which comes with 120GB data, plus unlimited minutes and texts on a 12‑month deal:
Unlimited minutes + Unlimited texts + £18 £12 a month (12‑month contract)
See full deal
Even though it's in our pick of Three's best SIM only deals, you can actually beat it on price with other providers, including ones that also use the Three network. See lower-priced networks' deals here:
Unlimited minutes + Unlimited texts +
£50 Currys gift card (automatic, no need to claim)
See full deal
Their £10 for 60GB plan is a decent deal for March
just
£10
a month
✔ Unlimited mins and 60GB data See full deal
at three.co.uk
(opens in new window)
If you don't want so much data, Three are also offering this £10 SIM, which includes 60GB data, unlimited minutes and texts on a 12‑month plan. It's another of their best deals:
Unlimited minutes + Unlimited texts +
See full deal
While this is a good enough deal to make it into the best of Three's SIMs, you can beat it for price (even if you definitely want a provider that uses the Three network). Here are other networks you can beat it on:
Unlimited minutes + Unlimited texts +
See full deal
Unlimited minutes + Unlimited texts +
See full deal
Unlimited minutes + Unlimited texts +
£30 cashback (automatic, no need to claim)
See full deal
They're also offering 30GB for £8 on SIM only currently
just
£8
a month
✔ Unlimited mins and 30GB data See full deal
at three.co.uk
(opens in new window)
For people who don't need that much data, you might like the £8 SIM only deal running on Three at the moment. It's a 12‑month plan, which comes with 30GB data, unlimited minutes and texts too:
Unlimited minutes + Unlimited texts + £16 £8 a month (12‑month contract)
See full deal
It's a good enough deal to get into Three'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 Three 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
£7 for 8GB is Three's next best SIM deal in March
just
£7
a month
✔ Unlimited mins and 8GB data See full deal
at three.co.uk
(opens in new window)
If that'd be too much data for you, we'd say this is one of Three's best deals on SIM only this month too. It's a 12‑month plan, comes with 8GB data, unlimited minutes and texts for £7 a month:
Unlimited minutes + Unlimited texts +
See full deal
In comparison to the rest of Three'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 Three network. Here's which other networks can beat it:
Unlimited minutes + Unlimited texts +
See full deal
Unlimited minutes + Unlimited texts + 5GB 8GB data (5G) = £6 a month (1‑month contract)
See full deal
Unlimited minutes + Unlimited texts +
See full deal
Unlimited minutes + Unlimited texts +
See full deal
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How Three's deals compare with other networks
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More about Three's SIM only plans
How Three compare on SIM only prices and benefits
We said in our full review of the Three network that our favourite thing about them is their fast 4G and 5G speeds as well as their encouraging 5G coverage.
On SIM only you can take a 1-month, 12-month or 24-month contract. Typically the longer the contract, the lower your monthly cost. But it’s always worth shopping around to find their best current deal.
Three’s “Lite” plans are much cheaper than the sorts of deals you’d get on other main networks. Three also have some premium plans with extra benefits baked in. You can take these on 12 or 24-month contracts.
All Three plans give you access to their handy Three+ rewards app. And you get EU and worldwide roaming passes included on their premium Value and Complete plans, as well as these other benefits.
Useful link: Read our full Three review
Other good things to know about Three’s SIM only plans
Three will send your SIM card within 3-5 working days. You’ll receive a package with every size of SIM in it, so you can fit your SIM into every phone. Three also offer eSIMs (see more info here).
You can return your SIM within 14 days to get a full refund if you’re not satisfied. Returning things you bought in a Three store is a bit more tricky, so read the full terms and conditions here to learn more.
To join on any Three SIM only contract you’ll have to pass a credit check. If you were rejected for a contract on Three then you can either take a monthly PAYG bundle or top up with credit and pay as you go.
If you want to keep your number when switching to Three from another network, you can do so by requesting a PAC from your old provider and giving it to Three at any time. Here’s their guide on how to do this.
Useful link: Compare all Three SIMs