Unlimited data SIM deals
Unlimited data SIM only plans give you no monthly data cap in the UK, but every network still sets a limit when you roam in the EU, from 5 GB on giffgaff to 50 GB on EE. Live unlimited deals below are sorted by total cost, and the table shows each network’s EU allowance and April price rise.
Facts checked: 24 October 2026 · Page updated: · Prices update daily
At a glance
Unlimited data in the UK, subject to each network’s fair use policy.
Network termsEE’s EU allowance, the highest of the networks we compare.
Checked 24 Oct 2026giffgaff, Talkmobile and Asda Mobile EU allowance.
Checked 24 Oct 2026SMARTY, giffgaff, Lebara and VOXI don’t raise prices mid-contract.
Checked 24 Oct 2026Live unlimited data SIM deals
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How the networks compare
| Network | Runs on | EU data allowance | Yearly rise (SIM only) |
|---|---|---|---|
| giffgaff | O2 | 5 GB | None |
| SMARTY | Three | 12 GB | None |
| Lebara | Vodafone | 30 GB on unlimited plans | None |
| VOXI | Vodafone | 20 GB | None |
| iD Mobile | Three | 30 GB | None |
| Lycamobile | EE | 5, 12 or 35 GB | None announced |
| Talkmobile | Vodafone | 5 GB | Not confirmed |
| Asda Mobile | Vodafone | 5 GB | Not confirmed |
| Sky Mobile | O2 | 25 GB | +£1.50 from 14 Feb 2026, not in the contract: 30 days to leave free |
| Three | Own network | 12 GB | +£1.80 to £2.30 by data allowance |
| EE | Own network | 50 GB | +£2.50 every 31 March |
| O2 | Own network | 25 GB | +£2.50 every April |
| Vodafone | Own network | 25 GB | +£2.50 (SIM Only Basics +£1.50) |
| Tesco Mobile | O2 | Fair use | about 6% as a fixed £ amount |
Do you need unlimited?
If you stream video or use your phone as a hotspot, unlimited saves you watching a counter. If you mostly use Wi‑Fi, a 30 to 100 GB plan is often cheaper. Check your last three bills for real usage.
How to switch and keep your number
- Get your PAC. Text PAC to 65075 from your current phone. It’s free.
- Order your new SIM and give the PAC to the new network.
- Your number moves in one working day and your old plan closes.
On a 12-month plan? We’ll warn you before April.
Add your network and end date. We’ll email you before every price rise and three weeks before your plan ends, with cheaper SIMs already lined up.
Unlimited data questions
Is unlimited data really unlimited?
In the UK there’s no data cap, but fair use policies apply. When roaming in the EU each network sets a limit, from 5 GB on giffgaff to 50 GB on EE.
Which unlimited SIM has the biggest EU allowance?
EE, with 50 GB, followed by Lebara and iD Mobile with 30 GB (checked October 2026).
Do unlimited plans go up in April?
On EE, O2 and Vodafone they rise by £2.50 a month every April. SMARTY, giffgaff, Lebara and VOXI don’t raise prices mid-contract.