Three's best SIM only offers: 30GB for £7, 60GB for £8
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We look at how Three compare on price this month against their competitors on SIM only and find their best offers. Last updated: 2nd July 2026.
Three's best SIM only deals
Our favourite SIM only deal this month on Three
just
£8
a month
✔ Unlimited mins and 60GB data See full deal
at three.co.uk
(opens in new window)
From all the options Three have got available this July on SIM only, we think this discounted £14 £8 12‑month deal is their best. For your £8 a month, you get 60GB data alongside unlimited minutes and texts:
With £6 off per month, the total saving over the deal’s 12 months adds up to £72.
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. Here's where else you can get a lower price:
We also like their £7 for 30GB plan
just
£7
a month
✔ Unlimited mins and 30GB data See full deal
at three.co.uk
(opens in new window)
If that's more data than you need, another option for you on Three is their discounted 12‑month SIM below, which costs £7 a month for 30GB data and comes with unlimited minutes and texts:
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). See who's offering it for less here:
Their 80GB for £10 SIM is another good option
just
£10
a month
✔ Unlimited mins and 80GB data See full deal
at three.co.uk
(opens in new window)
If you think you'll need even more data, Three have got a discounted £10 deal on SIM only we think's worth looking at. It gets you 80GB data, unlimited minutes and texts and it's a 12‑month plan:
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. Here's where you can beat it on other networks:
Three's 120GB for £12 plan is a good option too
just
£12
a month
✔ Unlimited mins and 120GB data See full deal
at three.co.uk
(opens in new window)
For those needing even more data, we think this discounted 120GB is one of the best SIM only plans on Three too. It's on a 12‑month deal, comes with unlimited minutes and texts - all for £18 £12 a month:
Add up that monthly saving of £6 over the full 12 months and you’re looking at a total discount of £72.
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. See lower-priced networks' deals here:
Their £18 for unlimited data plan is a decent deal for July
just
£18
a month
✔ Unlimited mins and unlimited data See full deal
at three.co.uk
(opens in new window)
To get an even bigger data allowance, we also think this discounted £28 £18 Three SIM is one of their best options. It comes with unlimited data, unlimited minutes and texts on a 12‑month deal:
If you add up the £10 monthly discount, you’ll save £120 in total over the full 12 months on the deal.
It does enough to get into our pick of Three's best SIMs but that doesn't mean it's unbeatable on price. Other providers (even ones that use the Three network) can beat it. Here are other networks you can beat it on:
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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