3 SIM Only Deals

Simply pop a Three SIM into a new or exisiting 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.

8GB for £8!
8GB for £8!
Our most popular SIM offer! | 8GB data | 12m contract | Just £1 per GB | Great Value!
Unlimited Data £18 per month
Unlimited Data £18 per month
Unlimited data for £18 per month - the best overall cost for unlimited data with a fair 12 month contract term.
4GB for just £7!
4GB for just £7!
4GB data | 12m contract | Time limited offer!
£7 13
12 Month SIMO

12 Month SIM Plans are the best combination of value and contract length. Receive all the Three perks plus great data allowances, and don’t get tied in for too long.

24 Month SIMO

24 Month SIM Plans give you peace of mind for two years. Get the very best prices by committing to a longer contract. Perfect if you have a that you are perfectly happy with and don’t plan to change for a while.

1 Month SIMO

1 Month SIMO plans are the best for flexibility and budget management. Switch between bundles to suit your needs and don’t worry about what will happen if you don’t need your SIM any more.

Micro / Nano / Standard SIM Sizes?

You don’t need to worry about SIM sizes ever again – all Three SIMs are triple SIMs that work in any phone. Simply press the correct size out of the cardboard template and put it straight in your phone.

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 had 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?

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 network.

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.

  • Generous data allowances at all  price points
  • No extra charge for 5G.
  • Three SIMs work in any unlocked 3G, 4G or 5G phones.
Is SIMO 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 concentrate on just the airtime and competition in that market means prices are kept low, with regular special offers and time limited deals.

Can I keep my old number?

Generally, 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.

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.