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Cheapest SIM-Only Deals in the UK

The lowest monthly prices on UK SIM-only plans, pulled straight from the live offers on GetSIMSmart and sorted cheapest first. No invented prices, no teaser rates — just the real rolling and prepaid plans you can order today, with honest notes on where the value actually lies.

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What Counts as a Cheap SIM-Only Deal

A cheap SIM-only deal is simply a low monthly price for a bundle of data, calls and texts on a SIM card, with no handset included. Because you bring your own phone, there is nothing to subsidise — so even the cheapest plans start at around £5 a month on GetSIMSmart.

The cheapest plans are almost always 30-day rolling or pay as you go. Both are paid in advance, so there is no credit agreement and no long-term commitment — you can leave any month. Fixed 12–24 month contracts are rarely the cheapest option for airtime alone.

The headline price is only half the story, though. A £2.80 plan with 15GB and a £10 plan with 50GB are both cheap, but they suit completely different people. The section on price vs value explains how to tell them apart.

The Cheapest Plans Compared

Every live plan on GetSIMSmart, sorted by monthly price from lowest to highest. Prices are the provider's standard price and can change — confirm on the provider's site before ordering.

Lebara

Vodafone network

£2.80*/mo

30-day rolling

* £2.80/mo for the first 6 months, then £7/mo. Sign up by Friday 11 December 2026.

15GB4G/5GLow user
  • No credit check
  • EU roaming 15GB
  • Unlimited UK minutes
  • Unlimited UK texts
  • 100 International minutes

Lebara

Vodafone network

£3.20*/mo

30-day rolling

* £3.20/mo for the first 6 months, then £8/mo. Sign up by Friday 11 December 2026.

30GB4G/5GBest all-rounder
  • No credit check
  • 100 international mins
  • Unlimited UK calls & texts
  • EU roaming 30GB

Lyca Mobile

EE network

£5*/mo

pay as you go

* £5/mo for the first 3 months, then £10/mo.

30GB4G/5GNew customer offer
  • No credit check
  • EU roaming 12GB
  • Unlimited UK calls & texts
  • 100 International minutes free
  • eSIM also available

1pMobile

EE network

£10/mo

30-day rolling

50GB4G/5GCheapest big data
  • No credit check
  • EU roaming 50GB
  • Unlimited UK calls & texts
  • eSIM also available

iD Mobile

3 network

£10/mo

1-month plan

80GB4G/5GGOOD VALUE
  • No credit check
  • Unlimited UK calls & texts
  • Roaming in 50 destinations
  • No annual price rises
  • 2 Months free Apple subscription

Chattr

O2 network

£15*/mo

30-day rolling

* reduces to £13/mo the longer you stay

Unlimited4G/5GBest Deal
  • No credit check
  • Unlimited data
  • Unlimited UK calls & texts
  • Tethering allowed

iD Mobile

3 network

£15/mo

30-day rolling

Unlimited4G/5GGOOD VALUE
  • No credit check
  • Unlimited data
  • Unlimited UK calls & texts
  • No annual price rises

1pMobile

EE network

£25*/mo

30-day rolling

* Additional SIMs £12.50/mo

UnlimitedUnlimited 4G/5GUnlimited data
  • No credit check
  • EU roaming
  • Unlimited UK calls & texts
  • eSIM also available

Links marked as sponsored may earn us a commission. Your price is unaffected, and the table order is sorted by price — never by commission.

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Price Versus Value for Money

The cheapest monthly price is not always the best value. The honest way to compare is cost per gigabyte — divide the monthly price by the data allowance — then match it to how much you actually use.

ProviderDataPrice£/GBBest for
Lebara15GB£2.80*£0.47Cheapest overall — light users on Vodafone
iD Mobile20GB£6£0.30Best £/GB — data rollover on Three
1pMobile50GB£10£0.20Lowest £/GB — EE, no speed caps
Lyca Mobile30GB£10£0.33100 international mins, EE
Lebara30GB£3.20*£0.27£8/mo after 6 months — Vodafone 5G, 100 intl mins
ChattrUnlimited£15—Cheapest unlimited on O2

If you use under 15GB a month, the £2.80 Lebara plan is genuinely the cheapest. If you use 30GB or more, the 30–50GB plans work out at roughly £0.20–£0.33 per GB — far better value than buying a bigger plan you will not finish.

Not sure how much data you need? Our guide to SIM-only deals by data usage breaks it down by user type.

Hidden Costs to Watch For

A low headline price can quietly grow if you are not careful. These are the charges that catch people out.

  • Out-of-bundle rates once your allowance runs out — these can be steep on pay-as-you-go.
  • Non-EU roaming charges, which are not covered by most plans.
  • Premium-rate calls and texts, which are never included in a bundle.
  • Add-ons you may be prompted to buy at checkout, such as extra international minutes.
  • Price rises mid-contract on fixed-term plans — rolling and prepaid plans avoid this because you can leave.

Rolling and prepaid plans sidestep most of these because you are never locked in — if the bill creeps up, you can switch. Read our guide to 30-day rolling SIM deals for more on how that flexibility works.

How to Keep Your Bill Low

  • Check last month's usage in your phone settings and buy only the data you actually use.
  • Prefer 30-day rolling plans over fixed contracts so you can downgrade any month.
  • Use Wi-Fi at home and work — most people need far less mobile data than they think.
  • Turn off background data and auto-play video in apps you rarely use.
  • Pick a plan with data rollover so unused allowance is not wasted.
  • Set a spend cap if your provider offers one, so you never accidentally go over.

The single biggest lever is buying the right allowance in the first place. Most people overbuy by 20GB or more, so checking your real usage before ordering usually saves more than any promotional discount.

Frequently Asked Questions

What is the cheapest SIM-only deal in the UK?

The cheapest live plan on GetSIMSmart is Lebara's 15GB bundle at £2.80 a month for the first 6 months (then £7/mo) on the Vodafone network, with unlimited calls and texts and EU roaming up to 15GB. It is a 30-day rolling plan, so you can cancel any time.

Are cheap SIM-only deals no credit check?

The cheap prepaid and 30-day rolling plans listed here are not credit agreements and are generally supplied without a hard credit search. A provider may still carry out identity, address or fraud-prevention checks, but these are not credit searches and will not appear on your credit file.

Is a cheaper plan always better value?

Not necessarily. A £7 plan with 15GB costs roughly £0.47 per GB, while a £10 plan with 50GB costs £0.20 per GB. If you actually use the data, the higher monthly price is far better value. Match the allowance to your real usage rather than chasing the lowest headline price.

Can I get a cheap SIM-only deal without a contract?

Yes. Every plan on this page is either a 30-day rolling bundle or pay as you go, so there is no long-term commitment. You pay for the month ahead and can leave with no penalty.

Will a cheap SIM work in any phone?

Any unlocked handset works. If your phone is locked to a network, ask that network for a free unlock code before you switch. Most providers ship a triple-cut physical SIM, and several — iD Mobile, Lyca Mobile and 1pMobile — also offer eSIM.

For the full picture across every plan type, read our complete guide to the best SIM-only deals in the UK.

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