Three unlimited data sim only deals
Three has a variety of unlimited data SIMs available on different contract lengths. If you need something different, Three are have a range of other SIM only deals available:
Our top pick
Mobile SIM Deal
12 months
DATA
Unlimited
allowance
MINUTES
Unlimited
allowance
PRICE
£18
per month
Airtime plan will increase every April bill thereafter. Price will be £19.50 from Apr 2026.
Mobile SIM Deal
Sale: £13.50 for 6 months
24 months
DATA
Unlimited
allowance
MINUTES
Unlimited
allowance
PRICE
£27
per month
Airtime plan will increase every April bill thereafter. Price will be £28.50 from Apr 2026. Airtime plan will increase every April bill thereafter. Price will be £30 from Apr 2027.
Mobile SIM Deal
Sale: £15.50 for 1 months
1 month
DATA
Unlimited
allowance
MINUTES
Unlimited
allowance
PRICE
£31
per month
Mobile SIM Deal
12 months
DATA
250 GB
allowance
MINUTES
Unlimited
allowance
PRICE
£16
per month
Airtime plan will increase every April bill thereafter. Price will be £17.50 from Apr 2026.
Mobile SIM Deal
24 months
DATA
250 GB
allowance
MINUTES
Unlimited
allowance
PRICE
£16
per month
Airtime plan will increase every April bill thereafter. Price will be £17.50 from Apr 2026. Airtime plan will increase every April bill thereafter. Price will be £19 from Apr 2027.
Mobile SIM Deal
Sale: £11 for 6 months
24 months
DATA
250 GB
allowance
MINUTES
Unlimited
allowance
PRICE
£22
per month
Airtime plan will increase every April bill thereafter. Price will be £23.50 from Apr 2026. Airtime plan will increase every April bill thereafter. Price will be £25 from Apr 2027.
Mobile SIM Deal
24 months
DATA
160 GB
allowance
MINUTES
Unlimited
allowance
PRICE
£12
per month
Airtime plan will increase every April bill thereafter. Price will be £13.50 from Apr 2026. Airtime plan will increase every April bill thereafter. Price will be £15 from Apr 2027.
Mobile SIM Deal
12 months
DATA
120 GB
allowance
MINUTES
Unlimited
allowance
PRICE
£12
per month
Airtime plan will increase every April bill thereafter. Price will be £13.50 from Apr 2026.
Showing 1 to 10 of 29 results
