5 sellers publishing a Unlimited data SIMs price
What Unlimited data SIMs cost in the UK, from published seller prices
Unlimited data is the one plan every publishing seller in this record publishes, which is why it is the ranking figure here: it is the same product everywhere, where a 30 GB tier and a 40 GB tier are not. The published spread is wide for a single product, from £12.50 over 30 days at Lycamobile to £23 a month at Vodafone and Utility Warehouse, with SMARTY at £20 and Ecotalk at £22.
- median published unlimited data SIM, per month
- £22
- published unlimited SIM prices across the sellers read
- £12.5 to £23
- sellers with an evidenced Unlimited data SIMs price
- 5
Sellers publishing a Unlimited data SIMs price
| Seller | Unlimited data, per month | Unlimited data SIMs page | Source | Checked |
|---|---|---|---|---|
| Lycamobile | £12.5/30 days, the UK Plan Unlimited row on the seller's own ladder | Lycamobile's own priced page | lycamobile.co.uk | September 2026 |
| SMARTY | £20/month, rolling monthly, unlimited data | SMARTY's own priced page | smarty.co.uk | September 2026 |
| Ecotalk | £22/month, unlimited data, one month term | Ecotalk's own priced page | ecotalk.co.uk | September 2026 |
| Utility Warehouse | £23/month, Unlimited Max, a from figure | Utility Warehouse's own priced page | uw.co.uk | September 2026 |
| Vodafone | £23/month, unlimited data, 24 month plan | Vodafone's own priced page | vodafone.co.uk | September 2026 |
Coverage of Unlimited data SIMs is evidenced by the seller's own page at the linked URL, checked on the date shown, never by a marketing claim. The headline figure above is the record's median published unlimited data SIM price, which is the one line comparable across sellers; the Unlimited data SIMs figures themselves are in the table below, each recording what it is per.
What moves an unlimited data bill
The term is most of the difference. A rolling monthly unlimited plan and a 24 month one are different commitments, and the cheaper headline is usually the longer tie.
An in-contract rise is the largest hidden cost in this market. Vodafone publishes that its unlimited plan increases to £25.50 on 1 April 2027 and £28 on 1 April 2028, which is a fifth over the term.
Unlimited is rarely unlimited without a policy. Lycamobile prints a fair usage note and a roaming data cap beside its unlimited plan, and Ecotalk marks its unlimited with an asterisk.
If you never reach 100 GB, unlimited is a premium for a headline. SMARTY publishes 100 GB at £12 against unlimited at £20.
Cite or embed this figure
The the seller's own published monthly price for an unlimited-data SIM in Unlimited data SIMs was £22 in September 2026, across 5 checked network price pages recorded in SIM Only Deals Compare Price Record.
Cite as: "SIM Only Deals Compare Price Record: Unlimited data SIMs", updated 2026-09-10, https://simonlydealscompare.co.uk/deals/unlimited-data-sims/.
Download the Unlimited data SIMs price record (CSV), free to reuse with citation.