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SIM Only deals

Happy with the handset you have but looking for a great SIM Only deal? At Three we’ve got a range of fantastic SIM Only packages – with 30-day, 12 and 24 month contracts and Pay As You Go across 5G SIMs, Unlimited Data SIMs and more.

Our best SIM deals

Low price

Unlimited 24 month Lite

£20 .00
a month

£20.00 per month, increasing to £21.50 from Apr26, £23.00 from Apr27. [1]

What’s included:

  • 5G ready at no extra cost
  • Unlimited calls and texts
  • Three+ rewards

6 months half price

120GB 24 month Lite

£8 .00
a month

£8.00 per month, increasing to £16 from Sept25, £17.50 from Apr26, £19.00 from Apr27. [1]

What’s included:

  • 5G ready at no extra cost
  • Unlimited calls and texts
  • Three+ rewards

6 months half price

25GB 24 month Lite

£14 .00
a month

£14.00 per month, increasing to £15.25 from Apr26, £16.50 from Apr27. [1]

What’s included:

  • 5G ready at no extra cost
  • Unlimited calls and texts
  • Three+ rewards

Want to see even more SIM deals?

Pay As You Go SIMs

Simply add our Pay As You Go SIM to your basket and select the Continue button to get a Free SIM or choose a Data Pack for ultimate value:

  • Unlimited minutes
  • Unlimited texts
  • No commitment

More SIMs from Three 

Pay Monthly Data SIMs 

A data SIM Only contract deal is ideal for connecting tablets, laptops, and mobile broadband devices to the internet when you’re on the move. 

Pay As You Go Data SIMs 

Choose one of our Pay As You Go Data SIMs to connect your tablets, laptops, and more to the internet without any ongoing commitment. 

What’s an eSIM? 

An eSIM is a virtual SIM built into your phone, allowing you to use it without inserting a physical SIM. There’s no waiting with eSIM –  we can email you one to use straight away. Many phones allow you to use an eSIM and a physical SIM, so you can have two numbers working from one phone. 

Looking for SIM Only for business?

Find the right SIM deal, however large or small your business.

Already with us?

Existing customers can access exclusive SIM Only deals.

Why choose Three SIM Only?

Based on analysis by Ookla® of Speedtest Intelligence® data for Q3-Q4 2024. Ookla trademarks used under license and reprinted with permission.

From 30-day to 24-month SIM deals 

Three’s SIM Only deals are available on a wide variety of contract lengths, including 30-day SIM deals, 12 month SIM contracts and 24 month SIM contracts.

Our longer SIM plans work out cheaper over their full contract length. If you’re looking for more flexibility, a shorter-term plan or a Pay As You Go plan could be the right choice.

30-day SIM Only deals

Enjoy a fixed monthly cost for your data, minutes, and texts. You’ll have the freedom to switch or cancel your plan with only 30 days’ notice.

12-month SIM Only deals 

Great value without a super-long contract. You’ll get fixed monthly payments for your data, minutes, and texts.

24-month SIM Only deals 

The longest of our SIM Only contracts, our 24-month plan gives you the best value month to month.

Get to know SIM Only on Three

What is a SIM Only deal?

A SIM Only contract is just that. No phone or tablet, just a SIM card with all the data, minutes, and texts you need. Pick a Pay Monthly SIM or Pay As You Go SIM plan that suits you. We’ve got Pay Monthly phone contracts ranging from 1GB a month to Unlimited Data SIMs. You get extra flexibility with Pay Monthly, because you can join us on a 1-, 12- or 24-month plan. Or simply request a free SIM to start on Pay As You Go. 

Types of SIM Only deals 

We offer 30-day, 12-, and 24-month plans across 5G SIMs, Unlimited Data SIMs, and more, so you can choose a SIM Only plan that suits your lifestyle and budget. And if you’re studying, you can also take advantage of our student discounts.

How does SIM Only work on Three? 

We’ll send you a physical SIM. When it arrives, put it in your phone, and you’ll automatically get a text confirming that you’ve connected to Three. Find out more about how to activate your SIM. 

Switch to Three and keep your number

Moving your number across to Three is simple. You’ll need a PAC code from your current provider – and you can get that just by sending a text. Find out how to switch to Three. 

How much data do I need?

Not sure how much data you need? We can help with that. We’ve written a short blog to help you understand how much data you use when you do various things on your phone. 

Why SIM Only?

If you don’t want a new phone, but your current contract is up, then SIM Only is perfect. You get extra flexibility with a Pay Monthly SIM, because you can join us on a 1-, 12-, 24-month plan. And there’s a huge range of data options, from 1GB to unlimited data plans. And if you choose Pay As You Go there’s no upfront cost. 

Frequently asked questions

A data SIM works the same way as a phone SIM, but it will connect your tablet or other mobile broadband device to the internet through our network. We’ve got a whole host of Data SIM plans, from unlimited data SIM Only plans to Pay As You Go Data SIMs with no contract.

Yes, you can. It’s easy to do it online, or even via text. All you need is your PAC code from your previous provider. Find out all you need to know about switching to Three.

If you're currently using a Pay As You Go SIM, then you'll be able to leave at any time. If you're on one of our Pay Monthly SIM Only contracts, then you'll be able to cancel when that contract is up for renewal, or you may be asked to pay a fee. Our Pay Monthly SIM Only contracts last for 1, 12 or 24 months. Alternatively, you have the option to upgrade your plan if you’ve been with Three for more than 90 days. Read more about Anytime Upgrade. 

Yes, with SIM Only you can still use all your favourite web messaging services, like WhatsApp and Facebook Messenger. Any data use will come out of your SIM plan allowance.

Yes, as long as you have a 5G device and you’re in a 5G area, our SIMs will have you covered. Take a look at our 5G coverage checker.

Yes, with a Three SIM you'll be able to use your device abroad. The process for activating Go Roam for your Three SIM differs slightly for Pay Monthly and Pay As You Go plans. You can find out more on our Go Roam page.

If you already have a plan with Three that includes a device, you’ll automatically be on a SIM Only contract once your device loan has been paid off. This will happen when you complete your first contract. 

If you don’t have a contract with Three, getting a SIM Only plan is easy. You can either get a SIM Only plan with a new number or you can choose to switch your current number to your new Three SIM.

As well as Pay As You Go SIM deals, Three offers 30-day, 12- and 24-month contracts on SIM Only. 

You'll probably need a nano SIM – it's the most used SIM in smartphones and tablets today. All Three SIMS are what’s known as trio SIMs, they can quickly be adapted to fit any size device, including nano. You can find more info on what size SIM you need here.

Have a handset you bought through another network? Providing your phone has been unlocked, then it should work just fine.

Follow these steps to activate your SIM:

  1. Insert your SIM into your phone and switch it on.
  2. We'll text you to let you know we've begun activating your SIM.
  3. We'll send you a second text telling you to turn your phone off and on again.
  4. Your SIM will be activated when you restart your phone.

You can find more info about activating your SIM here. 

An eSIM is a digital SIM built into devices that allows you to activate a plan without having to use a physical SIM. If you choose eSIM, there’s no waiting – we'll email you the eSIM for you to use straight away. You can install multiple eSIMs into a device and use two or more phone numbers at the same time.

Find out more about eSIM

We’ll send you a QR code which you can scan to activate your eSIM. Once activated, it will work in the same way as a traditional SIM, allowing you to browse the internet or take calls via the Three network. 

No, all Three’s SIMs are 5G compatible.

Dual SIM models allow you to use two SIM cards in one device. This is useful if you have different phone numbers for work and home. It’s great for travelling too – you can use a local number while keeping your original number active when abroad.

Most tablets and mobile devices use a nano SIM. Our Three SIMs are known as trio SIMs, because they can be adapted to fit any size phone, including nano. 

Yes, you’ll be able to roam and use your allowances abroad in over 160 locations around the world. Although the costs for roaming differ depending on whether you’re a Pay Monthly or a Pay As You Go SIM user. Read more about roaming with Three. 

eSIM Quick Transfer lets you bring a number over to a new phone faster and easier than ever.

It doesn’t matter whether you already have an eSIM or not – you can transfer a number from a physical SIM card to a new phone, or from an existing eSIM to a new device. 

eSIM Quick Transfer is only available for iPhone customers right now, but this technology could become available for Android users in the future.

  • Price increase

    Each April, your Monthly Charge will increase by a fixed amount depending on your plan’s data allowance. Plans 4GB or less and Smartwatch Pairing Plans will increase by £1.00 per month. Plans from 5GB to 99GB will increase by £1.25 per month. Plans 100GB or over will increase by £1.50 per month. All Home Broadband plans will increase by £2.00 per month.

    Visit the price increase page for full details.

    Your monthly charge includes a £5 discount for paying by a recurring method, such as Direct Debit. The £5 monthly recurring payment discount and the annual price increase do not apply to Add-ons, out-of-allowance charges, Three Your Way device plan agreement repayments, or Three Insurance premiums.

    Check out our full terms.

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