Three SIM Only Deals

We have collected all the Three SIM only deals available with helpful hints and tips to help you choose the best offer for you. Simply pop a Three SIM into a new or existing phone and you are good to go! A 3 SIM Only contract is the best way to get access to great prices and huge amounts of data. 

Our most popular Three SIM Only deals:

12 Month Three SIM only

12 Month SIM Plans are the best combination of value and contract length. Receive all the Three perks,  great data allowances and don’t get tied in for too long. For most customers 12m SIMO plans are the right combination of value and flexibility, and generally get the best discounts from Three.

Three SIM Only 12GB Data
12 month SIMO contract | 12GB data | Unlimited texts and calls
Three SIM Only 8GB Data
12 month SIMO contract | 8GB data | Unlimited texts and calls
Three SIM Only 4GB Data
12 month SIMO contract | 4GB data | Unlimited texts and calls
12 month SIMO contract | 3GB data | Unlimited texts and calls
Three SIM Only 1GB Data
12 month SIMO contract | 1GB data | Unlimited texts and calls

24 Month Three SIM only

24 months is perfect if you are happy with Threes great connectivity and want to lock in a price for the future.

Three SIM Only 8GB Data
24 month SIMO contract | 8GB data | Unlimited texts and calls
Three SIM Only 12GB Data
24 month SIMO contract | 12GB data | Unlimited texts and calls
24 month SIMO contract | 3GB data | Unlimited texts and calls
Three SIM Only 4GB Data
24 month SIMO contract | 4GB data | Unlimited texts and calls
Three SIM Only 1GB Data
24 month SIMO contract | 1GB data | Unlimited texts and calls

What Three SIM only deals can I get?

Three has an entire range of SIM deals available to suit all budgets and use cases. Choose from a rolling 30-day, 12-month or 24 month contract. Data allowances go from 500MB all the way up to unlimited data with no speed limits or tethering caps. With Three you always get the fastest speed your phone and the local network support. Your connection won’t be throttled if you use a lot of data.

How do I get the best value out of my SIM contract?

SIM contracts are available in 1, 12 or 24 month terms. When you do the maths the 12 months SIMs are often even better value than the longer 2 year contracts. We usually recommend the 12 month terms as the best combination of price and flexibility.

Can I keep my old number?

The answer is usually yes. If you are moving from another network you need to request a PAC code and provide it to Three who will use it to transfer your number to your new contract. If you already have a Three number then Three offer a range of upgrade deals just for you – just speak to the network.

Will a 3 SIM Card fit and work in my phone?

Good news! 3 SIM cards are all Triple SIMs so you don’t have to worry about Micro, Nano or Standard SIM sizes again.  A Three SIM will definitely fit in your phone. A clever slotting mechanism means you simply press the correct size out of the cardboard template and put it straight in your phone.

To connect to the Three network your phone needs to be unlocked. A lot of phones are already unlocked. If your phone isn’t unlocked then it is usually a simple process.

Does my phone need to be unlocked?

Your phone does need to be unlocked to use a SIM deal. Most 3 phones are unlocked by default, as are phones sold by Carphone Warehouse and giffgaff (double check, but most are…).

If your phone came from one of the major networks and you have owned it for a decent amount of time they should be able to assist you in unlocking it – either for free or a nominal fee.

Why Choose Three SIM Only deals?

Three SIM Only plans almost always come with unlimited calls and texts. it is is the data that sets them apart, and Three was built from the ground up to be the best network for mobile data.

Three covers 98.3% of the UK population and all plans are 5G ready. 4G Super-Voice gives you super clear voice calls and a better signal indoors.

  • A variety of plans to suit your needs.
  • Generous data allowances at all  price points
  • No extra charge for 5G.
  • Three SIMs work in any unlocked 3G, 4G or 5G phones.

SIM only deals are the perfect alternative to traditional mobile phone contracts. Match a SIM contract with a new or existing phone and you could save hundreds on your mobile phone bill. With a SIM only deal you are just paying for the texts, minutes and data. By making your own arrangements for the phone handset you avoid taking out what is in effect a loan.

SIM only deals are becoming more popular as phones become more expensive and more capable. You don’t have to buy a new phone every 2 years, and a SIM Only contact is the perfect way to keep yours on the road.

I have a 3 PAYG SIM – can I upgrade to a contract?

Yes you can! Simply purchase a new SIMO contract and fill in a quick form to transfer the number across. Three will even move any remaining credit across to count against your first bill.

Is Three SIM only much cheaper than a contract?

SIMO deals are a lot cheaper than mobile phone contracts for two reasons. Phone contracts are essentially a loan for the value of your chosen handset, plus an airtime contract. SIM Only plans just include the airtime which lowers the price. Regular special offers and time limited deals make 3 SIMO deals even better value.

3 SIM Only deals are generally the best value mobile contracts you can get. Keep your existing phone and take advantage of more texts, minutes and data for the money.

Keep your old phone and keep your old number with minimum hassle. All you need to do is contact your old network to ensure your phone is unlocked, and ask them for a PAC (Port Authorisation Code) – that will enable Three to transfer your old number across to your new SIM.

And remember, with a Three SIM-Only plan you get access to Three’s 5G network for no extra cost. If you’re in an area with 5G coverage and your device is compatible, you can take advantage of super speedy internet on your mobile with a great value All-You-Can-Eat data plan on Three.

Is there an Unlimited SIM option?

If you spend a significant amount of time on your phone then you may find an Unlimited plan useful. Let’s be honest, if you need unlimited data then you probably aren’t using your phone to make calls. Streaming music, watching movies and online gaming all use significant amounts of data, and just a few binging sessions can overwhelm almost any data plan.

Very few networks offer truly all-you-can-eat data with no speed caps or fair use policies to restrict how much data you use. Three is the only major network to offer this much freedom.

Can I tether my laptop or tablet to my Three SIM only connection?

You can share your entire data allowance with another device using tethering. iPhones and Android phones both make it easy to fire up a personal hot spot and tether any device. Some limits do apply when using data abroad, but they are generous and should not affect normal usage.

What about European Roaming?

Great news, all Three SIM Only Plans are Three Advanced Plans. That means they have great roaming provisions in Europe and popular global destinations. Use your texts, minutes and data as usual and be reassured you won’t receive a big bill at the end of your holiday.

5G sounds amazing. Can I get it?

Yes you can! All Three SIMO contracts are 5G enabled so you can use it as soon as 5G arrives in your local area. You will need a 5G ready phone which can be bought from a variety of sources. 5G on 3 doesn’t cost you any extra, and the 5G network is growing fast.

Three Clearance Deals