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Editor's pick · 1 live deals
Best unlimited data SIM deals UK
Hand-picked unlimited SIMs from across our Awin partners. Includes raw 5G capacity, fair-use details, and EU roaming flags so you don't get caught out.
1
Hand-picked
£24.00
Cheapest /mo
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Retailers
True unlimited 5G data in the UK starts from £12.50/mo on Smarty (Three network) and £14.95/mo on Talkmobile (Vodafone network). Both let you tether and stream without any soft cap.
FAQ
Common questions
Is unlimited UK SIM really unlimited?+
On Smarty, Talkmobile, giffgaff and 1pMobile: yes, with no fair-use cap. EE, O2 and Vodafone's main brands apply a soft fair-use cap of around 1TB/month — you'll never hit it but legally it's a cap.
Can I use unlimited SIM as home broadband?+
Yes — most allow tethering and hotspot use without a separate cap. Speeds depend on your local 5G coverage. Three's 5G has the largest UK footprint by area; Vodafone has the strongest urban coverage.