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Best Three SIM offers: 60GB for £8, 80GB for £10

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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: 17th April 2025.

Three's best SIM only deals

The best value SIM only deal on Three this month

Three SIM only deal
SIM only
just
£8
a month
🛈 Increased to: £9.25 on April 1 2026

Unlimited mins and 60GB data See full deal

at three.co.uk
(opens in new window)

Out of all the SIM only plans available this April on Three, we'd say their best value deal is their discounted 12‑month SIM below, which gets you 60GB data, plus unlimited minutes and texts for £16 £8 a month:

It’s a discount of £8 a month against the full price, adding up to a £96 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 lower-priced networks' deals here:

£10 for 80GB is Three's next best SIM deal in April

Three SIM only deal
SIM only
just
£10
a month
🛈 Increased to: £11.25 on April 1 2026

Unlimited mins and 80GB data See full deal

at three.co.uk
(opens in new window)

For more monthly data, have a look at Three's discounted 80GB SIM below at £16 £10 a month, as it's another good deal. It's on a 12‑month plan and comes with 80GB data, unlimited minutes and texts:

That discount will save you £6 a month, which adds up to £72 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 are other networks you can beat it on:

There's also a nice 250GB for £12 plan with them this month

Three SIM only deal
SIM only
just
£12
a month
🛈 Increased to: £13.50 on April 1 2026

Unlimited mins and 250GB data See full deal

at three.co.uk
(opens in new window)

To get even more data, another option for you on Three is their discounted 12‑month SIM below, which costs £22 £12 a month for 250GB data and comes with unlimited minutes and texts:

That’s £120 you’ll save over 12 months with the deal thanks to the £10 monthly discount.

There's not currently a better SIM only deal on the market than Three's one above if you want 250GB data or more. Here's the closest their competitors get for similar plans:

ASDA Mobile logo

Unlimited minutes + Unlimited texts + 0MB Unlimited data (5G) = £0 £11.50 a month for 6 months, then £23 (24‑month contract)
See full deal

150 Mbps speed cap
🛈 ASDA reserve the right to increase the cost of this plan annually with one month's notice
EE logo

Unlimited minutes + Unlimited texts + 0MB Unlimited data (5G) = £36 £24 a month (24‑month contract)
See full deal

Speed capped to 100 Mbps
🛈 Increased to: £25.50 on April 1 2026.
Increased to: £27.00 on April 1 2027
VOXI logo

Unlimited minutes + Unlimited texts + 0MB Unlimited data (5G) = £35 £30 a month (1‑month plan, no contract)
See full deal

🛈 VOXI reserve the right to increase the cost of this plan annually with one month's notice
Coop Mobile logo

Unlimited minutes + Unlimited texts + 0MB Unlimited data (5G) = £39 £31.20 a month (1‑month contract)
See full deal

🛈 Monthly price will increase each March by the Consumer Price Index rate of inflation published in January + 3.9%

Compare all SIM only plans

Compare deals from all networks

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

Ratings stars with the Three logo

We go over their network and benefitsRead our full review

at simsherpa.com
(opens in new window)

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 network map screenshot

Check signal where you use your phoneCheck your signal

at three.co.uk
(opens in new window)

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

Other Three guides