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1 live deals — May 2026
Unlimited data SIM-only deals
Everything we track that genuinely includes unlimited 5G/4G data — no fair-use cap, no speed throttling. Real UK prices, Awin verified.
- All deals include genuine unlimited data, not a soft 'unlimited' with throttling
- 5G access included on every plan
- Some include free EU roaming — flagged on each card
1
Live deals
£24.00
Cheapest /mo
1
Networks
Cheapest first — top 1 deals
Sorted by total monthly cost. Click any deal to see full terms and switch on the provider's website.
FAQ
Common questions
What's the cheapest unlimited UK SIM right now?+
Smarty's £12.50/mo unlimited plan on Three's network is currently the cheapest in the UK. Talkmobile's £14.95/mo unlimited on Vodafone is a close second with better congestion priority.
Is 'unlimited' really unlimited?+
On Smarty, Talkmobile and giffgaff: yes, with no fair-use cap. Some networks (notably EE, O2 and Vodafone's main brands) apply a soft fair-use cap of 1TB/month — you'll never hit it but legally it's a cap.