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SIM only · By data

Cheapest SIM only deals up to 20GB

Enough if you mostly use Wi-Fi at home and work, and use mobile data for maps, messages and some browsing.

7 deals from 6 providers. Cheapest: Talkmobile 10GB 30-day at £5.95 a month.

Providers
All
Contract
Any length

7 deals

Vodafone

5GB

  • 5GB data
  • 24 months
  • Vodafone network
  • 5G
  • EU roaming extra
  • eSIM

Download speed capped at 100Mbps.

Check Vodafone coverage at your postcode

£19/mo

  • then £21.50 from Apr 2027
  • then £24 from Apr 2028

Total cost: £516 · avg £21.50/mo

View deal

Checked 26 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 up to 20gb data

Up to 20GB covers messaging, maps, email, social media and music for most people who are on Wi-Fi at home and work. Video is what uses data fastest: Netflix says standard definition uses up to 1GB an hour.

Small allowances are where budget brands are cheapest, often on rolling monthly plans you can change if you find you need more.

Cheapest up to 20gb plan from each provider

ProviderPlanNetworkContractMonthlyEU roaming
Talkmobile 10GB 30-day Vodafone Rolling £5.95 Included
SMARTY 20GB Three Rolling £9 Included
iD Mobile 10GB 1-month Three Rolling £6 Included
giffgaff 20GB rolling O2 Rolling £10 Included
VOXI 20GB + unlimited social Vodafone Rolling £10 Pass needed
Vodafone 5GB Vodafone 24 months £19 Daily charge

How far does that data go?

Hours of Netflix each allowance covers in a month, using Netflix's figures of up to 1GB an hour in standard definition, 3GB in HD and 7GB in 4K. Messaging, maps and browsing use far less.

DataStandard definitionHD4K
5GB 5 hours 1 hours 0 hours
10GB 10 hours 3 hours 1 hours
20GB 20 hours 6 hours 2 hours

Up to 20GB SIM only questions

Which is the cheapest up to 20gb SIM only deal?

Talkmobile 10GB 30-day at £5.95 a month on a rolling plan.

Should I choose a rolling plan or a contract?

6 of the 7 plans here roll monthly, so you can leave or change any time. Contracts can be cheaper for the same data, but 1 of the plans here have rises during the contract, shown on each deal.

Do these plans include EU roaming?

5 of the 7 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?