Save big with 6 months half price on all 24m SIMs

SIM plans for phones -
5G Ready at no extra cost

When you’re happy with the phone you’ve got, SIM Only is a great choice. If you’re joining us from another network you can keep your number and pick from a 1, 12, or 24-month plan. You’ll be free to use your allowance in over 70 destinations around the world for a low daily charge, with Go Roam.

*Price includes £5 monthly discount for paying by a recurring method, such as direct debit. Each April, your Monthly Charge will increase by 4.5%. If you’ve already got this handset, Three has a range of options to get it connected. Check out our SIM Only deals. Daily roaming charge of £2 applies to unlock your UK allowances in Go Roam in Europe destinations, and £5 in Go Roam Around the World. Excludes the Republic of Ireland and Isle of Man. Fair use policies apply. See

SIM plan benefits

Control your spending

If you run out of minutes, you can block outgoing calls so you don't run up any extra charges. Plus, you can block calls and texts to numbers that always fall outside of your allowance (like 0845 and 118).

Add extra data any time

Don't worry if you run out of data halfway through the month. You can buy more any time you like in your My3 account, giving you all the flexibility you need.

Set usage limits and alerts

Along with our fixed data allowances, our usage alerts for minutes and data make sure you never spend more than you planned.

Switching to a new SIM plan

Already on one of our older plans? As your minimum term has ended, you can switch to one of our new plans any time you like. It's really easy - we just move your new plan details on to your existing SIM.

Keep your existing number

Joining us from another network? We’d love to have you. To keep your own number, text ‘PAC’ to 65075 to get your code, and then switch to Three.

Delivery of your SIM

Sign up to one of our new plans today and you'll have your new SIM in 3 working days.

Contract and billing

When you buy a SIM from our website, you’ll need to activate it when you receive it. Your plan will begin once activation is complete. Your first bill will be a bit higher than your usual monthly charge, because you'll be charged for up to nine days extra. This is so you can get connected as soon as you’ve got your device. After your first bill it should go back to normal. Then, your remaining payments are due on the same date each month until the end of your 12 or 24 month contract.

If you're a student or a business owner, we've got exclusive deals for you.
Check out our range of SIM Only student discounts or business SIM Only plans.

Never stop streaming, gaming, and browsing. For no speed caps and truly Unlimited data,
check out our Unlimited data plans.

With Personal Hotspot, you can use your phone’s data allowance to connect up your other devices. Pretty handy for when you’re nowhere near a Wi-Fi connection. On our Essential Plans, you can’t use your inclusive data allowance to create a personal hotspot.

With our Advanced plans, you can unlock your UK allowances for 24 hours in Go Roam destinations. It’s £2 in Go Roam in Europe, and £5 in Go Roam Around the World destinations. Republic of Ireland and Isle of Man are excluded from the daily roaming charge. Our Fair Use Policies apply.

With Personal Hotspot, you can use your existing data allowance to connect other devices to your phone and get online. Pretty handy when there's no Wi-Fi.

The 5G revolution is upon us. And from launch, all new and existing customers with a 5G Ready device can join the party. Whether you are on a contract, SIM only or PAYG.

Got a 5G Ready handset now? Sweet. All our SIMs are 5G ready at no extra cost. Obvs. And as soon as 5G comes round your way, you’ll be able to frolic in 5G wonder.

You’ll be able to upgrade your data plan whenever you need. To enjoy 5G at full pelt, with uncapped speeds, choose an Unlimited data plan - so you never run out of data juice.

With a business plan on Three, you get up to £500 worth of benefits from our partners to support your business. From creating stationery with Moo, to nailing the accounts with a 6-month FreshBooks subscription - we’ve got you covered, whatever your business needs.

Our Business plans let you use Go Roam Around the World in 71 destinations, at no extra cost. You can also use your phone as a Personal Hotspot, and call free from your mobile to Customer Services.

Use our Advanced plans in 71 destinations around the world, for a low daily charge of £2 for Go Roam in Europe and £5 for Go Roam Around the World.

With our Essential plans you’ll save some money on your contract but miss out on features such as Go Roam Around the World and Personal Hotspot allowance, although you’ll still be able to use Go Roam in Europe. For limits and further information - see

Comes with Adapt 25, and Adapt 50.

Unlimited minutes, texts, and data, across your team.

So you won’t be stuck overspending, worrying about data limits or second guessing how much you’re using.

Award-winning business support.

Whatever you need, our experts are here.

  • Award-winning, dedicated business support from our Business Service Team.
  • Get in touch for technical help, and all your account queries.
  • Call direct, or chat to the team online.

Three Analyst Standard.

Your online analytics tool, with 24 hour access to your mobile usage and spend.

  • Accessible insights on your Three Business spending and usage, anytime, anywhere.
  • High level data exports. Download, file, and keep track of your costs.
  • Easily digestible, accessible bill summaries, and personalised reports to your inbox.

Upgrade to the Complete service plan any time. You can get Three Analyst Standard as an Add-on to any Three Business account.

Comes with Adapt 75, Adapt 100, and Adapt 250.

Unlimited minutes, texts, and data, across your team.

So you won’t be stuck overspending, worrying about data limits or second guessing how much you’re using.

The only business plan of its kind with a dedicated Customer Success Manager.

Your person to contact, whatever you need.

  • A business-dedicated, single point of contact for all your account queries.
  • Owning your enquiries, leaving you to focus on work.
  • Regular account reviews on what you need, and how we can help.

Three Analyst Advanced.

Your online analytics tool, with 24 hour access to the mobile usage and spend of your whole team.

  • User-level analytics on the usage of your entire team. The insight to make better decisions.
  • Bespoke or favourite reports on your usage and spend, straight to your inbox.
  • Unlimited export of data. Download all the details, and stay in control of your account.

You can get a Customer Success Manager, and Three Analyst Advanced, as Add-ons to any Three Business account.