Compare Three SIMs: 30GB for £7, 60GB for £9
The retailers featured on this page may compensate us when our readers follow links to their websites and make a purchase. More
See how we rate each of the choices on Three's SIM only, compared with other UK mobile networks' closest plans. Last updated: 26th August 2026.
Three's best SIM only deals
This month's overall best Three SIM only deal
just
£9
a month
✔ Unlimited mins and 60GB data See full deal
at three.co.uk
(opens in new window)
Out of all Three's SIM only plans they've got running this August, our current best pick would be their discounted £14 £9 one below. It's on a 12‑month deal, gets you 60GB data, plus unlimited minutes and texts as well:
Getting £5 off a month means you’ll save £60 over the course of your 12‑month deal.
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. See which networks that are cheaper here:
Three's 30GB for £7 plan is a good option too
just
£7
a month
✔ Unlimited mins and 30GB data See full deal
at three.co.uk
(opens in new window)
For those with smaller data needs, have a look at Three's discounted 30GB SIM below at £7 a month, as it's another good deal. It's on a 12‑month plan and comes with 30GB data, unlimited minutes and texts:
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:
Their £10 for 80GB plan is a decent deal for August
just
£10
a month
✔ Unlimited mins and 80GB data See full deal
at three.co.uk
(opens in new window)
To satisfy even bigger data needs, another option for you on Three is their discounted 12‑month SIM below, which costs £10 a month for 80GB 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:
They're also offering 120GB for £12 on SIM only currently
just
£12
a month
✔ Unlimited mins and 120GB 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 £18 £12 deal on SIM only we think's worth looking at. It gets you 120GB data, unlimited minutes and texts and it's a 12‑month plan:
It’s a total discount of £72 over the 12 months, when you add up the deal’s monthly £6 saving.
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:
£18 for unlimited data is Three's next best SIM deal in August
just
£18
a month
✔ Unlimited mins and unlimited data See full deal
at three.co.uk
(opens in new window)
For those needing even more data, we think this discounted unlimited data 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 £28 £18 a month:
Add up that monthly saving of £10 over the full 12 months and you’re looking at a total discount of £120.
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:
Compare all SIM only plans
Compare deals from all networks
How Three's deals compare with other networks
Networks
Providers:
Plan
Data: (0MB+)
Minutes: (0+)
Thanks, we'll send that out now. Please check your inbox for our email.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