Looking for a powerful, data-packed SIM only plan with UK-wide 5G coverage?
Three SIM only deals are among the most popular and best-rated in the UK, offering unlimited data, affordable 1-month and 12-month options, and extensive roaming benefits.
Why Choose Three?
- Massive 5G Network – one of the UK’s fastest and most reliable.
- Flexible Contracts – choose from 1-month rolling or 12/24-month plans.
- Unlimited Data Options – ideal for streaming, gaming, and sharing.
- Go Roam – use your plan in 71 destinations worldwide.
- Award-Winning Coverage – great performance across most UK cities.
Top Three SIM Only Plans This Month
Three Lite SIM Only
120GB
of 5G data
12 Months Contract
£12
until April 2027
Price rises every April in contract by £2.30
Three+ rewards included
Three Lite SIM Only
60GB
of 5G data
12 Months Contract
£9
until April 2027
Price rises every April in contract by £1.90
Three+ rewards included
Three Lite SIM Only
Unlimited
5G data
24 Months Contract
£22
until April 2027
Price rises every April in contract by £2.30
Three+ rewards included
Three Lite SIM Only
80GB
of 5G data
12 Months Contract
£10
until April 2027
Price rises every April in contract by £1.90
Three+ rewards included
Three Lite SIM Only
Unlimited
5G data
12 Months Contract
£18
until April 2027
Price rises every April in contract by £2.30
Three+ rewards included
Three Lite SIM Only
15GB
of 5G data
12 Months Contract
£7
until April 2027
Price rises every April in contract by £1.90
Three+ rewards included
Three Lite SIM Only
60GB
of 5G data
24 Months Contract
£10
until April 2027
Price rises every April in contract by £1.90
Three+ rewards included
Three Lite SIM Only
250GB
of 5G data
24 Months Contract
£16
until April 2027
Price rises every April in contract by £2.30
Three+ rewards included
Three Lite SIM Only
250GB
of 5G data
12 Months Contract
£16
until April 2027
Price rises every April in contract by £2.30
Three+ rewards included
Three Lite SIM Only
120GB
of 5G data
24 Months Contract
£12
until April 2027
Price rises every April in contract by £2.30
Three+ rewards included
Three Lite SIM Only
eSIM
Available
60GB
of 5G data
12 Months Contract
£9
until April 2026
Price rises every April in contract by £1.90
Three+ rewards included
Three Lite SIM Only
eSIM
Available
250GB
of 5G data
12 Months Contract
£16
until April 2026
Price rises every April in contract by £2.30
Three+ rewards included
Three Lite SIM Only
eSIM
Available
60GB
of 5G data
24 Months Contract
£10
until April 2027
Price rises every April in contract by £1.90
Three+ rewards included
Three Lite SIM Only
eSIM
Available
25GB
of 5G data
24 Months Contract
£14
until April 2027
Price rises every April in contract by £1.90
Three+ rewards included
Three Lite SIM Only
eSIM
Available
120GB
of 5G data
24 Months Contract
£16
until April 2027
Price rises every April in contract by £2.30
Three+ rewards included
Three Pay as you Go – Data Packs SIM Only
eSIM
Available
Three+ rewards included
Three Pay as you Go – Data Packs SIM Only
eSIM
Available
Three+ rewards included
Three Lite SIM Only
eSIM
Available
Unlimited
5G data
24 Months Contract
£22
until April 2027
Price rises every April in contract by £2.30
Three+ rewards included
Three Lite SIM Only
eSIM
Available
80GB
of 5G data
12 Months Contract
£10
until April 2026
Price rises every April in contract by £1.90
Three+ rewards included
Three Pay as you Go – Data Packs SIM Only
eSIM
Available
Three+ rewards included
Three Lite SIM Only
eSIM
Available
120GB
of 5G data
12 Months Contract
£12
until April 2026
Price rises every April in contract by £2.30
Three+ rewards included
Three Pay as you Go – Data Packs SIM Only
eSIM
Available
Three+ rewards included
Three Lite SIM Only
eSIM
Available
15GB
of 5G data
12 Months Contract
£7
until April 2026
Price rises every April in contract by £1.90
Three+ rewards included
Three Lite SIM Only
eSIM
Available
250GB
of 5G data
24 Months Contract
£16
until April 2027
Price rises every April in contract by £2.30
Three+ rewards included
Three Lite SIM Only
eSIM
Available
Unlimited
5G data
12 Months Contract
£18
until April 2026
Price rises every April in contract by £2.30
Three+ rewards included
Three vs Other Networks
Compared to O2, EE, and Vodafone, Three consistently leads on value for money — offering unlimited data from under £20, free roaming in 70+ countries, and broad 5G coverage included in every plan. Three remains one of the most competitive SIM only providers in the UK.
Who Is Three Best For?
Perfect for heavy data users, travelers, and families who want reliable, high-speed 5G and global roaming.
If you’re constantly streaming, gaming, or tethering, Three’s unlimited plans are built for you.
How to Switch to Three
- Visit Three.co.uk to order your SIM.
- Request your PAC code from your old provider.
- Activate your new SIM — keep your number and start using Three’s network instantly.
See our detailed guide on How To Switch Sim Providers
Final Verdict
Active and valid Three SIM only deals offer unbeatable data value, fast 5G, and generous roaming.
Whether you want a 1-month flexible plan or an unlimited powerhouse, Three continues to be one of the best SIM only choices in the UK.