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Three 12-month SIM only deals

Three 12-month SIM only deals are a great way to save money by committing longer. If you need something different, Three are have a range of other SIM only deals available:

What happens at the end of a Three 12-month SIM only contract?

Once your 12-month term ends, the plan usually rolls onto a 30-day rolling basis, so you're free to leave with 30 days' notice or move to a newer deal.

It's worth reviewing your plan around the 12-month mark to make sure you're still getting the best value.

Is a Three 12-month SIM only deal cheaper than a 30-day plan?

Generally yes. Committing to 12 months usually unlocks a lower monthly price or a larger data allowance than an equivalent 30-day rolling plan, because you're guaranteeing Three a year of custom.

The trade-off is less flexibility to leave early, so it suits people happy to stay with Three for a year.

Our top pick
logo
Unlimited speed
5G+

Three 100GB 15pm 12m SIM Only

Data
100 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
12 months
Total cost: £180
Price
£15per month
Get deal
logo
Unlimited speed
5G+

Three 30GB 10pm 12m SIM Only

Data
30 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
12 months
Total cost: £120
Price
£10per month
Get deal

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logo
Unlimited speed
5G+

Three 30GB 10pm 12m SIM Only

Data
30 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
12 months
Total cost: £120
Price
£10per month
Get deal
logo
Unlimited speed
5G+

Three UNL 12m SIM Only

Data
Unlimited
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
12 months
Total cost: £204
Price
£17per month
Get deal
logo
Unlimited speed
5G+

Three 12GB 9pm 12m SIM Only

Data
12 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
12 months
Total cost: £108
Price
£9per month
Get deal
logo
Unlimited speed
5G+

Three 8GB 7pm 12m SIM Only

Data
8 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
12 months
Total cost: £84
Price
£7per month
Get deal
logo
Unlimited speed
5G+

Three UNL 12m SIM Only

Data
Unlimited
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
12 months
Total cost: £204
Price
£17per month
Get deal
logo
Unlimited speed
5G+

Three 12GB 9pm 12m SIM Only

Data
12 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
12 months
Total cost: £108
Price
£9per month
Get deal
logo
Unlimited speed
5G+

Three 100GB 15pm 12m SIM Only

Data
100 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
12 months
Total cost: £180
Price
£15per month
Get deal
logo
Unlimited speed
5G+

Three 250GB 12m SIM Only

Data
250 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
12 months
Total cost: £192
Price
£16per month
Get deal
logo
Unlimited speed
5G+

Three 30GB 10pm 12m SIM Only

Data
30 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
12 months
Total cost: £120
Price
£10per month
Get deal

Showing 1 to 10 of 11 results

A 12-month term with Three offers a middle ground between the flexibility of a 30-day rolling plan and the longer commitment of a 24-month contract, typically at a better price than rolling while returning you to the market within a year.

1. Why choose 12 months with Three

Committing for a year usually unlocks a better rate than Three's rolling monthly pricing, suiting anyone confident in Three's network and data-focused plans for the year ahead.

2. Three's network and data focus

Three has built much of its reputation around generous data allowances and early 5G rollout. Check coverage at your home and work postcodes before committing for 12 months, and compare allowances against our mobile data guide.

3. Comparing against Three's other terms

Compare this 12-month option against Three's 24-month deals, its 30-day rolling plan, and its unlimited data plans.

4. Locking in a data allowance for a year

Given Three's positioning around generous data, it's worth choosing an allowance on your 12-month plan that comfortably covers not just your current usage but any growth you expect over the year, since you won't be able to change tier as easily as on a rolling plan.

5. Frequently asked questions

Is a 12-month Three contract cheaper than 24 months?
Typically the monthly price is a little higher than an equivalent 24-month deal, in exchange for a shorter overall commitment.

Can I leave a 12-month Three contract early?
You'll typically need to pay for the remaining months, so only commit if confident about your plans.

Is Three good for heavy data users?
Yes, Three has historically positioned itself around generous data allowances.

Does Three offer 5G on 12-month plans?
Check current specific plan details, since 5G availability can vary by package.

6. Conclusion

A 12-month Three contract offers a reasonable balance of price and commitment, backed by the network's data-focused positioning. Compare it against Three's other terms before deciding.