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Three 24-month SIM only deals

Three 24-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:

Why choose a 24-month Three SIM only deal over a shorter contract?

A 24-month SIM only plan typically offers the lowest monthly cost and often the biggest data allowances, which suits people happy to stay with Three for the long term.

Spreading the commitment over two years keeps the monthly price down, though you'll be tied in for longer than with a 30-day or 12-month plan.

Can I change my plan during a 24-month Three contract?

You can usually move up to a higher-priced plan with more data mid-contract, but downgrading to a cheaper plan before the term ends is often restricted.

Check the upgrade terms in your My3 account before committing if you think your data needs might change over the two years.

Our top pick
logo
Unlimited speed
5G+

Three 1GB 6pm 24m SIM Only

Data
1 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £144
Price
£6per month
Get deal
logo
Unlimited speed
5G+

Three 12GB 10pm 24m SIM Only

Data
12 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £240
Price
£10per month
Get deal

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logo
Unlimited speed
5G+

Three 30GB 14pm 24m SIM Only

Data
30 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £336
Price
£14per month
Get deal
logo
Unlimited speed
5G+

Three 8GB 8pm 24m SIM Only

Data
8 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £192
Price
£8per month
Get deal
logo
Unlimited speed
5G+

Three 12GB 10pm 24m SIM Only

Data
12 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £240
Price
£10per month
Get deal
logo
Unlimited speed
5G+

Three 30GB 14pm 24m SIM Only

Data
30 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £336
Price
£14per month
Get deal
logo
Unlimited speed
5G+

Three 8GB 8pm 24m SIM Only

Data
8 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £192
Price
£8per month
Get deal
logo
Unlimited speed
5G+

Three 1GB 6pm 24m SIM Only

Data
1 GB
(Unlimited speed included)
Sold by:Fonehouse logo
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £144
Price
£6per month
Get deal

A 24-month contract with Three is typically its longest commitment, generally offering the lowest monthly price of its standard terms. Given Three's focus on generous data allowances, it's a strong option for heavy users confident in committing to the network for a full two years.

1. The trade-off of a two-year commitment

Two years is a long time to be tied to a specific data allowance and price. If your usage grows, or better deals appear elsewhere, you'll generally need to wait until renewal, since early exit typically means paying for the remaining months.

2. Checking Three's coverage before committing long-term

Check Three's coverage specifically for where you live and work before locking in for two years, including current 5G availability if that matters to you.

3. Comparing against shorter Three terms

If two years feels too long, compare this option against Three's 12-month deals or its 30-day rolling plan for more flexibility.

4. Data-heavy users and long commitments

Since Three's core appeal is generous data, a 24-month term can suit heavy users well provided their usage stays reasonably stable. If your data needs are still growing — a new streaming habit, a new job with more remote work — consider whether a shorter term or unlimited data plan gives you more headroom.

5. Frequently asked questions

Is a 24-month Three contract the cheapest option?
Often it offers the lowest monthly price of Three's standard terms, though compare against renewing a shorter contract over the same period.

What happens if I need to leave early?
You'll typically need to pay for the remaining months on the contract.

Does Three's 24-month plan include more data than shorter terms?
This varies by specific offer, so compare the exact allowance and price directly.

Is Three's network good for 5G over a two-year term?
Three was an early mover on 5G rollout, though coverage continues to expand, so check current availability for your area.

6. Conclusion

Three's 24-month contract typically offers the lowest monthly price of its standard terms, in exchange for the longest commitment. Compare it against shorter terms before locking in for two years.