Best SIM offers on Three: 30GB for £8, 15GB for £7
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Check which of Three's choices on SIM only work out best on price this month, compared to other UK mobile networks. Last updated: 8th January 2026.
Three's best SIM only deals
Our highest-rated SIM only deal on Three this month
just
£8
a month
✔ Unlimited mins and 30GB data See full deal
at three.co.uk
(opens in new window)
Looking at what you can get on SIM only with Three this January, our best-rated deal would be their discounted 12‑month plan below, which comes with 30GB data, plus unlimited minutes and texts for £8 a month:
It's definitely one of Three'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 Three network. Here are other networks you can beat it on:
Their £9 for 60GB plan is a decent deal for January
just
£9
a month
✔ Unlimited mins and 60GB data See full deal
at three.co.uk
(opens in new window)
If you need more data, our next best pick of Three SIM only plans is their discounted 12‑month £16 £9 deal below, which gets you 60GB data and unlimited minutes and texts:
It’s a discount of £7 a month against the full price, adding up to a £84 saving over the 12 months.
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 the networks with cheaper plans here:
They're also offering 15GB for £7 on SIM only currently
just
£7
a month
✔ Unlimited mins and 15GB data See full deal
at three.co.uk
(opens in new window)
If you need less data, Three are also offering this discounted £14 £7 SIM, which includes 15GB data, unlimited minutes and texts on a 12‑month plan. It's another of their best deals:
That discount will save you £7 a month, which adds up to £84 over the course of the 12‑month 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's which other networks can beat it:
£10 for 80GB is Three's next best SIM deal in January
just
£10
a month
✔ Unlimited mins and 80GB data See full deal
at three.co.uk
(opens in new window)
To get even more data, you might like the discounted £10 SIM only deal running on Three at the moment. It's a 12‑month plan, which comes with 80GB data, unlimited minutes and texts too:
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 where you can get it for less here:
There's also a nice unlimited data for £18 plan with them this month
just
£18
a month
✔ Unlimited mins and unlimited data See full deal
at three.co.uk
(opens in new window)
For people who need even more data, we'd say this is one of Three's best deals on SIM only this month too. It's a discounted 12‑month plan, comes with unlimited data, unlimited minutes and texts for £28 £18 a month:
That means a total saving of £120 when you add up the £10 discount over 12 months.
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 are the networks offering it cheaper:
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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