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3 SIM Only Deals
Sim Only
4GB data Unlimited minutes Unlimited texts
£9.00 a month
See Deal
Essential Plan. 12 month contract
Includes: EU Roaming
Cheap SIM Only Deals
Sim Only
8GB data 600 minutes Unlimited texts
£12.00 a month
See Deal
Advanced Plan. 12 month contract
Includes: Worldwide Roaming Tethering Go Binge
 contract SIM plan  deal
Sim Only
30GB data Unlimited minutes Unlimited texts
£17.00 a month
See Deal
Advanced Plan. 12 month contract
Includes: Worldwide Roaming Tethering Go Binge
 contract SIM plan  deal
Sim Only
100GB data Unlimited minutes Unlimited texts
£25.00 a month
See Deal
Advanced Plan. 12 month contract
Includes: Worldwide Roaming Tethering Go Binge

Browse all SIM plans


What is a SIM Only plan?

A SIM Only deal offers you a bundle of minutes, texts and data just like a standard mobile phone contract.

However, the difference is that you don't get a smartphone, you only get a SIM card included, which enables you to save a significant amount of money and can also mean a shorter contract, as these plans are usually only 1 or 12 months in length. 

It’s ideal if you already have a smartphone that you’re happy to use, but just want good value on your minutes, texts and data.

Save today with Cheap SIM Only Deals on Three.

What are the advantages of a SIM Only deal?

There are a host of reasons to choose a SIM Only plan:

Save money on your bill

SIM Only plans offer you even better value because the operators don't have to offset the cost of a mobile phone, enabling you to get more minutes, data and texts for less, which is great news for those who are happy with their existing phone or tablet.

More flexibility with shorter contract lengths

Waiting for the next big smartphone or tablet? SIM Only contracts are perfect for you because they come with shorter contract lengths than standard 24-month mobile contracts. SIM Only plans are available on 12-month or 1-month rolling contracts. Or you can choose a Pay As You Go SIM card for even more flexibility.

Keep your old phone or buy one outright

Happy with your old phone? Or have the money to buy a new one SIM free? Then going SIM Only is the best option, as it gives you that freedom.

There are also plenty of benefits unique to Three, which you can read about below.

Why choose a Three SIM Only deal?

SIM Only contracts and Pay As You Go SIMs on Three come with a host of added extras that you won't get elsewhere including:

4G at no extra cost

All plans come with '4G at no extra cost'. If you don't have a 4G phone or aren't in a coverage area don't worry, you'll still be able to use Three's 3G network.

Free Roaming Abroad

Use your minutes, text and data abroad at no extra cost in EU destinations on all plans and worldwide in 60 countries on an Advanced Plan.

Go Binge

Go Binge is included with all Advanced Plans with 4GB data allowance and above (Phone and SIM plans) and with all all Pay Monthly Mobile Broadband plans with 4GB data allowance and above.

Tethering included

Tethering is included on Advanced Pay Monthly plans (up to 30GB per month). Tethering enables you to share internet with other devices using a personal hotspot.

Unlimited data

Truly unlimited data plans on Three. SIM Only Deals Unlimited Data with no speed caps or usage limits.

Free 0800 Calls

Free calls to 0800 numbers on all Pay Monthly plans!

Unlimited texts

All Three SIM Only contracts include unlimited texts, so you can send all the messages you want.

WiFi Calling

Three lets you call and text over Wi-Fi, either with its free inTouch app, or completely seamlessly.

4G Super-Voice

Three also lets you call over 4G, also known as VoLTE, or in Three’s case 4G Super-Voice. This leads to clearer calls and fills in coverage blackspots.

Free Wi-Fi on London Underground

Three’s plans include free Wi-Fi on the London Underground, so you can browse the web and stay in touch on your journey.

You can also get a free SIM card to top up when you please.

Can I get a SIM Only contract for my phone?

Yes. Three’s SIM Only plans are available for all handsets, and all SIM card sizes are also provided. The only thing you’ll have to check is that your phone isn’t locked to a different network.

If it is you’ll first have to contact that network and ask them to unlock it. If in doubt, call the network you’ve been using with your phone to find out.

Ready to buy? Head here to check out Three’s SIM Only contracts.

Can I get a Data Only SIM for my tablet, dongle or Mobile WiFi device?

Yes. Three offers Data Only SIM plans which are ideal for tablets, dongles and Mobile WiFi. These come with data but without any minutes or texts, and come on 1-month or 12-month contracts with up to 20GB of data.

Can I get a Pay As You Go SIM card?

Yes. Three offers free Pay As You Go phone SIMs and charges just 3p per minute, 2p per text or 1p per megabyte of data to use them.

Alternatively, you can turn your credit into an add-on, giving you a bundle of minutes, texts and data, right up to unlimited data, 500 minutes and 3000 texts for £25, valid for 30 days.

Check out Three’s Pay As You Go SIM cards.

Are unlimited data SIM Only plans available?

Yes, SIM cards with truly unlimited data are available on Three with no speed caps or restrictions. They are available on 1-month or 12-month Advanced plans and come with 4G at no extra cost, tethering included and free roaming abroad in 60 countries.

The best SIM Only deals with unlimited internet can be compared on our unlimited data page.

Can you tether with a SIM Only plan?

Tethering, or a personal hotspot as it’s sometimes called, is included with all 3 Pay Monthly SIM Advanced Plans, allowing you to use your data to get other devices online.

The only restriction is that those with unlimited data can only use a maximum of 30GB per month for tethering and tethering isn't included on Three Essential Plans or Pay As You Go.

Which type of SIM card do I need?

The type of SIM card you need depends on the device you have. There are 3 SIM types (Standard, Micro and Nano), but the good news is that when you order a Three SIM card you’ll get a trio-SIM which gives you all 3 SIM types in one.

Then, you just pop out the one you want, selecting from the following options:

Trio SIM

All SIM plans for phones on Three come with a Trio SIM (Standard, Micro and Nano), so you don't need to worry about which type of SIM you need.

Standard SIM

For use in the majority of old smartphones phones and the majority of mobile broadband and Mobile WiFi dongles.

Micro SIM

For use in many slightly newer smartphones including the iPhone 4S and Samsung Galaxy S5. Popular tablets with a micro SIM include the Apple iPad, Apple iPad 2 and the Apple iPad 4. 

Nano-SIM

For use in most of the latest smartphones including the iPhone 7, Samsung Galaxy S8 and HTC U11. Along with the latest tablets including the iPad Pro 10.5, iPad Pro 12.9, iPad Air 2 and iPad Mini 4.

If in any doubt as to which you’ll need you can always call Three for help on 0800 033 8004.

Can I keep my existing number when switching to SIM Only?

Yes. You can quickly and easily bring over your existing number to Three SIM Only. Check out our full guide to keeping your number to find out how.

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SIM DEAL!  4GB data, Unlimited mins just £9 a month See Deal