Three SIM only deals for September: 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: 10th September 2024.
Three's best SIM only deals
The SIM only deal on Three we rate highest this month
just
£12
a month
✔ Unlimited mins and 120GB data See full deal
at three.co.uk
(opens in new window)
We'd say Three's £12 SIM only plan below is their best option this September. It's on a 12‑month deal and gets you 120GB data, unlimited minutes and texts:
Unlimited minutes + Unlimited texts + 120GB data (5G) = £18 £12 a month (12‑month contract)
See full deal
It might be one of Three's best deals on SIM only but you can get a lower price for a similar plan on other providers, even ones that use the Three network. Here's which other networks can beat it:
Unlimited minutes + Unlimited texts + 150GB data (5G) = £6 a month for 6 months, then £12 (24‑month contract)
See full deal
Unlimited minutes + Unlimited texts + 120GB data (5G) = £14 a month (12‑month contract)
See full deal
Three's 30GB for £8 plan is a good option too
just
£8
a month
✔ Unlimited mins and 30GB data See full deal
at three.co.uk
(opens in new window)
If you need less data, we also think this £8 Three SIM is one of their best options. It comes with 30GB data, unlimited minutes and texts on a 12‑month deal:
Unlimited minutes + Unlimited texts + 30GB data (5G) = £16 £8 a month (12‑month contract)
See full deal
This is good for Three but it's not an unbeatable price. You can get similar SIM only plans for less with some other providers, even ones that also use the Three network. See where you can get it for less here:
Unlimited minutes + Unlimited texts + 15GB 30GB data (5G) = £6.95 a month (1‑month contract)
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Unlimited minutes + Unlimited texts + 30GB data (5G) = £7 a month (1‑month contract)
See full deal
Unlimited minutes + Unlimited texts + 40GB data (5G) = £5 a month for 3 months, then £10 (1‑month plan, no contract)
See full deal
Unlimited minutes + Unlimited texts + 40GB data (4G) = £8 a month (12‑month contract)
See full deal
🛈 Annual Price Increase: monthly plan increases annually on 1 April by £1.00
Their £6 for 12GB plan is a decent deal for September
just
£6
a month
✔ Unlimited mins and 12GB data See full deal
at three.co.uk
(opens in new window)
For a smaller amount of data, Three's £6 SIM below is another of their best deals this month. For £6 a month, it offers 12GB data, unlimited minutes and texts on a 12‑month plan:
Unlimited minutes + Unlimited texts + 12GB data (5G) = £6 a month (12‑month contract)
See full deal
Three have actually got the best price in the UK at the moment for a SIM only deal 12GB data or more. If you want to see the plans other networks this beats, use the dropdown below:
Unlimited minutes + Unlimited texts + 15GB data (5G) = £2.78 a month for 3 months, then £6.95 (1‑month contract)
See full deal
Unlimited minutes + Unlimited texts + 30GB data (5G) = £7 a month (1‑month contract)
See full deal
Unlimited minutes + Unlimited texts + 40GB data (5G) = £5 a month for 3 months, then £10 (1‑month plan, no contract)
See full deal
Unlimited minutes + Unlimited texts + 40GB data (4G) = £8 a month (12‑month contract)
See full deal
🛈 Annual Price Increase: monthly plan increases annually on 1 April by £1.00
Unlimited minutes + Unlimited texts + 20GB data (5G) = £10 £8 a month (1‑month plan, no contract)
See full deal
Unlimited minutes + Unlimited texts + 12GB data (5G) = £10 £9 a month (24‑month contract)
See full deal
Unlimited minutes + Unlimited texts + 30GB data (5G) = £9.90 a month (1‑month plan, no contract)
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Unlimited minutes + Unlimited texts + 20GB 45GB data (5G) = £10 a month (1‑month plan, no contract)
See full deal
Unlimited minutes + Unlimited texts + 25GB data (5G) = £10 a month (1‑month plan, no contract)
See full deal
Unlimited minutes + Unlimited texts + 25GB data (5G) = £10 a month (12‑month contract)
See full deal
Unlimited minutes + Unlimited texts + 25GB data (5G) = £10 a month (18‑month contract)
See full deal
Unlimited minutes + Unlimited texts + 15GB data (5G) = £10 a month (1‑month plan, no contract)
See full deal
Unlimited minutes + Unlimited texts + 10GB 30GB data (5G) = £13 a month (1‑month contract)
See full deal
Unlimited minutes + Unlimited texts + 15GB 45GB data (5G) = £14 a month (12‑month contract)
See full deal
Unlimited minutes + Unlimited texts + 25GB 30GB data (5G) = £25 £16 a month (24‑month contract)
See full deal
🛈 Prices rise each year on March 31st by £1.50
Unlimited minutes + Unlimited texts + 12GB data (5G) = £17.99 a month (24‑month contract)
See full deal
Unlimited minutes + Unlimited texts + Unlimited data (5G) = £12.50 a month for 1 month, then £25 (1‑month contract)
See full deal
🛈 Prices reduce over time!
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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