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.

3 months free

Unlimited data

24 month plan
Lite plan

£25 .00
a month

Annual Airtime Price Rises. CPI + 3.9% [1]

What’s included:

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

3 months free

250GB data

24 month plan
Lite plan

£20 .00
a month

Annual Airtime Price Rises. CPI + 3.9% [1]

What’s included:

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

3 months free

120GB data

24 month plan
Lite plan

£16 .00
a month

Annual Airtime Price Rises. CPI + 3.9% [1]

What’s included:

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

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 on Three

Pay Monthly Data SIM

Connect your tablet or other mobile broadband device to the internet through our network on a data SIM Only contract.

Pay As You Go Data SIM

Stay connected to the internet on the move and top up as and when you want on a Three Pay As You Go Data SIM Only contract.


An eSIM is a virtual SIM that’s been built into a phone, removing the need for a physical SIM to be inserted and allowing you to use one handset for work and play using both an eSIM and physical SIM on one device.

Need a business SIM

Looking for Business SIM Only deals? With great deals on Unlimited Data, EU Roaming, Personal Hotspot and more on physical Business SIMs and Business eSIMs, plus discounts on multi-buys, we’ve got a load of options for you to choose from.

Already with us?

See our exclusive SIM Only deals for existing customers.

Why choose Three SIM Only?

*Based on analysis by Ookla® of Speedtest Intelligence® data for Q3-Q4 2023. Ookla trademarks used under license and reprinted with permission.

Explore 30-day, 12 month and 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.

If you’re willing to commit, a longer-term contract works out cheaper for lots of people. If you’re looking for more flexibility, a shorter-term plan could be the answer – enabling you to switch to or try out another plan with different perks.

30-day SIM Only deals

Enjoy a fixed monthly cost for your data, minutes and texts with 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, with fixed monthly payments for your data minutes and texts.

24 month SIM Only deals

The longest of our SIM Only contracts, our 24 Month SIM Only plans give you the ultimate value per 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 SIM cards. You get extra flexibility with Pay Monthly, because you can join us on a 1, 12 or 24-month plan. And if you choose Pay As You Go there’s no upfront cost.

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?

With 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. You’ll be ready to go in no time. The process for eSIM is even faster.

Switch to Three and keep your number

Moving your number across to Three is simple. You’ll need a PAC or STAC code from your current provider, and then it’s just a case of 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. Take our mini quiz to get a better idea of what your data requirements might be.

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 Pay Monthly, because you can join us on a 1, 12 or 24-month plan. And 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. Simply send a text to switch to Three and keep your number.

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. Just let us know 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. The Pay Monthly SIM Only contracts last 1, 12 or 24 months.

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 contract with Three that includes a handset, you’ll automatically be on a SIM Only contract once your handset is paid off. 

Don’t have a contract of any sorts 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 port 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. 

If you're getting a SIM card for your tablet, you'll probably need a Nano SIM – it's the most used SIM in smartphones and tablets today. If you're not sure which SIM you need, you’ll be able to find these details in the specs of the device you already have or would like to buy.

Have a handset you bought through another network? Providing your Three SIM card is the right size for your phone, and your phone has been unlocked, then it should work just fine. 

Activating your physical. Three SIM is simple.

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 then 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.

Instead of having to insert a physical SIM card, with eSIM we’ll give 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.

To be able to use 5g you’ll need a 5g compatible SIM card. All new SIMs that Three issues are 5g compatible.  

An eSIM is an industry-standard digital SIM built into devices that allows you to activate a plan without having to use a physical SIM. You can install multiple eSIMs and use two phone numbers at the same time.

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, for example if you’d like to use a local number while keeping your original number active when abroad.

If you’d like to be able to access the internet on the go, without having to connect to WiFi, then you’ll need to have a Data SIM card inserted in your tablet. 

SIM cards come in a variety of sizes but the most common today is the Nano SIM which is used by most newer model tablets and mobile devices.

Three offers Go Roam to both SIM Only customers and SIM and device plan customers. 

Daily roaming charges

Unless stated otherwise, there’s a daily roaming charge to unlock your UK allowance for 24 hours in Go Roam destinations. You'll be charged as soon as you use any of your plan's allowances in a Go Roam destination.

If you’re on Pay As You Go, or your Pay Monthly plan started before 1 October 2021, these charges won’t apply. Republic of Ireland and Isle of Man are excluded from the daily charge. Fair use policies apply in Go Roam destinations, check out our FAQs for more info.

Countries not covered in the Go Roam destinations are charged at standard roaming rates. See our Price Guides for the latest information and pricing.

Check out whether the destination you’re travelling to is included in Three’s Go Roam offering.