Cheapest SIM Deals in the UK (Updated Weekly)

We track the lowest-cost SIM-only plans from major UK networks and show you the best value in one place.

How do we choose these deals?
No contracts · Cancel anytime
Deals from major UK networks
Updated every week

Today's Top SIM-Only Deals

Hand-picked based on lowest price, data per £, and flexibility.

Best Overall
Smarty

Unlimited Data – £10/month

£10/month

30-day rolling · No contract

  • Unlimited data, calls & texts
  • 5G included at no extra cost
  • EU roaming included
View Deal on Smarty

We may earn a commission if you switch, at no extra cost to you.

Best for Social Media
Voxi

45GB Data + Endless Social

£12/month

30-day rolling · No contract

  • Endless social media (no data used)
  • Unlimited UK calls & texts
  • 5G included
View Deal on Voxi

We may earn a commission if you switch, at no extra cost to you.

Giffgaff

25GB Always-On Data

£10/month

30-day rolling · No contract

  • Always-on data (never runs out)
  • Unlimited UK calls & texts
  • Community support 24/7
View Deal on Giffgaff

We may earn a commission if you switch, at no extra cost to you.

Under £10 SIM Deals

Cheapest options if you just want to cut your bill.

Best Overall
Smarty

Unlimited Data – £10/month

£10/month

30-day rolling · No contract

  • Unlimited data, calls & texts
  • 5G included at no extra cost
  • EU roaming included
View Deal on Smarty

We may earn a commission if you switch, at no extra cost to you.

Giffgaff

25GB Always-On Data

£10/month

30-day rolling · No contract

  • Always-on data (never runs out)
  • Unlimited UK calls & texts
  • Community support 24/7
View Deal on Giffgaff

We may earn a commission if you switch, at no extra cost to you.

Cheapest
1pMobile

10GB Data Deal

£5.99/month

30-day rolling · No contract

  • EE network coverage
  • Unlimited UK calls & texts
  • No credit checks
View Deal on 1pMobile

We may earn a commission if you switch, at no extra cost to you.

Smarty

6GB Starter Plan

£6/month

30-day rolling · No contract

  • Perfect for casual users
  • Money back on unused data
  • No commitment
View Deal on Smarty

We may earn a commission if you switch, at no extra cost to you.

Best for International
Lebara

5GB International

£5/month

30-day rolling · No contract

  • International minutes to 41 countries
  • Vodafone network
  • Rolling monthly contract
View Deal on Lebara

We may earn a commission if you switch, at no extra cost to you.

Compare by Network

Browse deals from specific networks to find the perfect match for your needs

How We Pick These Deals

Value First

We prioritize data per pound and overall value, not just the cheapest price.

Network Quality

Only networks with reliable UK coverage and good customer ratings.

Real Users

We check actual user reviews and contract flexibility before recommending.

Why Choose a SIM-Only Deal in the UK?

SIM-only deals are the smart way to save money on your mobile phone bill in 2025. Unlike traditional phone contracts that lock you into expensive 24-month agreements, SIM-only plans give you flexibility and significant cost savings. With prices starting from just £5 per month, you can get unlimited calls, texts, and generous data allowances without paying for a handset you don't need.

Top UK Networks for SIM-Only Deals

We compare deals from all major UK mobile networks including Smarty, Voxi, Giffgaff, Lebara, 1pMobile, and more. Each network offers different benefits - from unlimited social media data to international calling minutes. Our comparison tool helps you find the perfect match for your usage patterns.

5G SIM Deals with No Extra Cost

Most modern SIM-only deals now include 5G connectivity at no extra charge. This means faster download speeds, better streaming quality, and improved performance in busy areas. Whether you're in London, Manchester, Birmingham, or anywhere across the UK, 5G coverage is expanding rapidly and available with these affordable plans.

No Credit Check SIM Deals

Several networks offer SIM-only plans with no credit checks required, making them perfect for students, people with poor credit history, or anyone who wants hassle-free sign-up. These rolling 30-day contracts give you the freedom to cancel anytime while enjoying competitive rates and reliable UK network coverage.

Frequently Asked Questions

Last updated: 6 December 2025

We check and refresh the deals once per week or sooner if networks change pricing.