Three UK SIM & eSIM Plans Reviewed (2026)

Updated May 7, 2026 · Jules de Bruin, Editor · Verified against current Three tariff pages

Updated May 2026. Three is the UK's 5G speed leader, posting 193.8 Mbps 5G download in Opensignal's January 2026 London report — the fastest of the four UK networks. SIM-only starts at GBP 7/month for 15 GB, scales to 60 GB at GBP 8, and unlimited plans are competitively priced. Three+ rewards add partner offers and event access at no extra cost. MVNOs SMARTY, iD Mobile, and Honest Mobile all run on the Three network at lower prices.

Plans
Network
Pros & cons
Sign up
FAQ

London 5G speed

193.8 Mbps

Opensignal Jan 2026, #1

Cheapest plan

GBP 7

15 GB / 12 mo

Best value

GBP 8

60 GB / 12 mo

MVNOs hosted

SMARTY, iD Mobile, Honest

Which Three plan is best for me?

For most users, 60 GB at GBP 8 on a 12-month plan is the value sweet spot. Heavy users go to unlimited. Rolling 1-month users pick 60 GB at GBP 10. If you want Three's network at a lower price, SMARTY 100 GB at GBP 10 is hard to beat.

Plan	Contract	Price	Data	Notes	Action
15 GB SIM-only	12 mo	GBP 7/mo	15 GB	Entry tier	Claim Deal
60 GB SIM-only	12 mo	GBP 8/mo	60 GB	Best value	Claim Deal
60 GB rolling	1 mo	GBP 10/mo	60 GB	No commitment	Claim Deal
Unlimited	24 mo	GBP 16+/mo	Unlimited	Three+ included	Claim Deal

How fast is Three's network?

Three has the fastest 5G in London at 193.8 Mbps in Opensignal's January 2026 report. EE leads consistency; O2 leads 5G availability; Vodafone leads reliability. Three is the right pick if you stream 4K, upload large files, or play cloud-gaming on the move. Three is part of TfL's Underground rollout including the full Elizabeth line.

What are the pros and cons of Three?

Pros

Fastest 5G in London (193.8 Mbps)
Strong value at GBP 8 for 60 GB
Three+ rewards at no extra cost
Rolling 1-month plans available
eSIM, VoLTE, VoWiFi all supported

Cons

EE leads on consistency
O2 leads 5G availability
Three-network MVNOs (SMARTY, iD Mobile) often cheaper
Coverage outside cities trails EE on 4G

How do I sign up for Three?

1
Pick your plan on three.co.uk. SIM-only is the value default.
2
Choose eSIM or physical SIM. eSIM activates by QR code via the My3 app.
3
Credit check. Required for postpaid; rolling SIM-only often skips this.
4
Port your number. Text PAC to 65075, enter the code at checkout.
5
Activate. eSIM ready in minutes; physical SIM ships within 1-2 working days.

Frequently asked questions about Three

Is Three the fastest UK network?

Three leads 5G download speed in London at 193.8 Mbps in Opensignal's January 2026 report. EE leads consistency; O2 leads 5G availability; Vodafone leads reliability. Pick Three for raw 5G speed.

How much does Three cost?

Three SIM-only starts at GBP 7/month for 15 GB on a 12-month contract. 60 GB is GBP 8; 60 GB on 1-month rolling is GBP 10. Unlimited plans start in the GBP 16 range.

What is Three+?

Three+ is Three's loyalty rewards programme. Customers get partner offers, prize draws, and event access at no extra cost.