Once you’ve committed to a 12 month SIM Only plan with Three, you can’t cancel the contract before the 12 months is up.
12 month SIMs: here’s why we love them
Value
As the plans run for a year, you can enjoy better value per month than a shorter plan.
Flexibility
You’re not tied into a super-long contract, which is perfect if your circumstances change.
Upgrades
If, after a year, you’d like to amend your plan or change to a phone contract, we have loads of options.
Get more with Three Your Way
Lite, Value or Complete, see which plan suits you, with Three Your Way. It’s mobile done your way.
Three Your Way plans on 12 month SIMs
Lite
What’s included:
- 5G ready at no extra cost
- Unlimited calls and texts
- Three+ rewards
Paramount+ as an optional add on
Value
What’s included:
- 5G ready at no extra cost
- Unlimited calls and texts
- Three+ rewards
Complete
What’s included:
- 5G ready at no extra cost
- Unlimited calls and texts
- Three+ rewards
Enjoy peak entertainment
Get hit movies, exclusive premieres and brilliant shows you can’t find anywhere else with Paramount+. Even on the go.
Roaming built-in
Going travelling? Use your phone like you’re at home for up to 56 days in over 160 worldwide destinations.
Why get a 12 month SIM on Three?
What’s a 12 month SIM Only plan?
From only £11, you can connect to our super-fast 5G network for a year. They’re great value, and you can opt for a Value or Complete plan that includes Paramount+ and roaming.
How do 1 year SIMs work?
Our 1 year SIM Only plan gives you access to our network for 12 months. After that, if you’re happy with it, you can renew your contract or upgrade to a 24 month SIM plan, or a plan with a device.
You can keep your existing 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.
Upgrade easily
If you love your 12 month SIM – and we think you will – then upgrading to a plan with a device, or moving to a longer-term SIM plan with Three is simple, and it can all be done online.
Easy activation
Once your SIM arrives, put it in your phone, and you’ll get a text confirming that you’ve connected Three automatically. You’ll be ready to go in no time.
Increase your data limit
If you run out of data, it’s easy to get more. You can increase your monthly allowance or purchase a data Add-on anytime online, and start using your new data straight away.
Three+ rewards app
Download our Three+ app to claim exclusive offers from brands like Cineworld and Caffè Nero. Plus, presale tickets to some of the UK’s biggest festivals.


Unlimited data
12 month plan
What's included:
Choose a Lite, Value or Complete plan to suit you

120GB data
12 month plan
What's included:
Choose a Lite, Value or Complete plan to suit you

25GB data
12 month plan
What's included:
Choose a Lite, Value or Complete plan to suit you
Compare our SIM Only plans
Check out our SIM Only deals
From only £9, and with loads of different data options, there’s a SIM Only deal for everyone on Three. Check out our 12 month, 24 month and Pay As You Go SIMs.
Frequently asked questions
Why choose Three?
Based on analysis by Ookla® of Speedtest Intelligence® data for Q3-Q4 2024. Ookla trademarks used under license and reprinted with permission.