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SIM only · By data

Cheapest unlimited data SIM only deals

No allowance to watch. Most unlimited plans still have a fair use policy, and some cap speeds.

12 deals from 8 providers. Cheapest: Lyca Mobile Unlimited at £12.50 a month.

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Contract
Any length

12 deals

Lyca Mobile

Unlimited

  • Unlimited data
  • 1-month rolling
  • EU roaming included
  • eSIM

Includes 100 international minutes.

Check coverage at your postcode

£12.50/mo

Price can change with notice. Leave any time.

View deal

Checked 26 Oct 2026

Three

Unlimited Lite

  • Unlimited data
  • 24 months
  • Three network
  • 5G
  • EU roaming extra

Download speed capped at 100Mbps. No roaming included (Lite tier).

Check Three coverage at your postcode

£22/mo

  • then £24.30 from Apr 2027
  • then £26.60 from Apr 2028

Total cost: £583 · avg £24.30/mo

View deal

Checked 26 Oct 2026

O2

Unlimited Plus

  • Unlimited data
  • 24 months
  • O2 network
  • 5G
  • EU roaming included
  • eSIM
Check O2 coverage at your postcode

£25.49/mo

  • then £27.99 from Apr 2027
  • then £30.49 from Apr 2028

Total cost: £672 · avg £27.99/mo

View deal

Checked 15 Oct 2026

Three

Unlimited Lite+

  • Unlimited data
  • 24 months
  • Three network
  • 5G
  • EU roaming extra

Full speed (no 100Mbps cap). No roaming included.

Check Three coverage at your postcode

£26/mo

  • then £28.30 from Apr 2027
  • then £30.60 from Apr 2028

Total cost: £679 · avg £28.30/mo

View deal

Checked 17 Oct 2026

Vodafone

Unlimited Plus

  • Unlimited data
  • 24 months
  • Vodafone network
  • 5G
  • EU roaming included
  • eSIM

Download speed capped at 100Mbps.

Check Vodafone coverage at your postcode

£26/mo

  • then £28.50 from Apr 2027
  • then £31 from Apr 2028

Total cost: £684 · avg £28.50/mo

View deal

Checked 26 Oct 2026

Three

Unlimited Complete

  • Unlimited data
  • 24 months
  • Three network
  • 5G
  • EU roaming included

Download speed capped at 100Mbps. Includes Paramount+ for 24 months.

Check Three coverage at your postcode

£28/mo

  • then £30.30 from Apr 2027
  • then £32.60 from Apr 2028

Total cost: £727 · avg £30.30/mo

View deal

Checked 17 Oct 2026

What happens when you click View deal: you go to the provider's own site to check your address and order. Your contract and any problems with installation or billing are with the provider. MoneyRoute never takes payment or your details.

Living with unlimited data

Unlimited plans suit heavy streamers, people who hotspot a laptop for work, and anyone who doesn't want to think about data. Most have a fair use policy, and some cap download speeds, often at 100Mbps on cheaper unlimited plans.

Roaming is where unlimited plans differ most: some include a set amount of EU data, some charge daily, and some need a pass.

Cheapest unlimited plan from each provider

ProviderPlanNetworkContractMonthlyEU roaming
Lyca Mobile Unlimited Not stated Rolling £12.50 Included
iD Mobile Unlimited 1-month Three Rolling £20 Included
SMARTY Unlimited Three Rolling £20 Included
Three Unlimited Complete Three 24 months £28 Included
giffgaff Unlimited rolling O2 Rolling £35 Included
O2 Unlimited Plus O2 24 months £25.49 Included
Vodafone Unlimited Plus Vodafone 24 months £26 Included
VOXI Unlimited Vodafone Rolling £35 Pass needed

Unlimited SIM only questions

Which is the cheapest unlimited SIM only deal?

Lyca Mobile Unlimited at £12.50 a month on a rolling plan. Note: Includes 100 international minutes.

Should I choose a rolling plan or a contract?

5 of the 12 plans here roll monthly, so you can leave or change any time. Contracts can be cheaper for the same data, but 5 of the plans here have rises during the contract, shown on each deal.

Do these plans include EU roaming?

9 of the 12 plans include EU roaming, usually with a fair use limit. The others charge a daily fee or need a pass. Use the roaming filter above to see only plans that include it.

Is a budget brand as good as a big network?

Budget brands run on one of the four networks, so the coverage is the same as that network's. Each plan above shows which network it uses.

Other data amounts

Data use figures: Netflix: how much data does Netflix use?