SIM

Compare SIM-only deals

SIM card

Compare the UK's best SIM-only deals from EE, O2, Vodafone, Three and more. 1-month, 12-month and unlimited data plans. Switch and save today.

Top 3 best-value SIM-only deals today

  1. 1. Mozillion 1GB SIM Only, 12-month · Mozillion

    £5.50/mo

    £2.75/mo + £33.00 upfront · 12-month

    Buy nowDetails

  2. 2. giffgaff SIM Only on golden goodybag with Unlimited mins & texts… · giffgaff

    £6.00/mo

    No upfront cost · 30-day

    Buy nowDetails

  3. 3. giffgaff SIM Only on goodybag 1GB with Unlimited mins & texts… · giffgaff

    £6.00/mo

    No upfront cost · 30-day

    Buy nowDetails

Ranked by effective monthly cost: the monthly price plus any upfront cost spread over the contract.

List of SIM-only deals (161)

161 deals · from 5 retailers · Updated 4h ago

Mozillion 1GB SIM Only, 12-month

Mozillion
1 GBof 5G data
12 month contract
£2.75a month
£33.00 upfrontEffective £5.50/mo
£66.00 total cost
  • NEW
Buy now
at MozillionDeal details

giffgaff SIM Only on golden goodybag with Unlimited mins & texts…

giffgaff
2 GBof 5G data
No contract
£6.00a month
No mid-contract price rise£0.00 upfront
  • No upfront cost
  • No contract
Buy now
at giffgaffDeal details

giffgaff SIM Only on goodybag 1GB with Unlimited mins & texts…

giffgaff
1 GBof 5G data
No contract
£6.00a month
No mid-contract price rise£0.00 upfront
  • No upfront cost
  • No contract
Buy now
at giffgaffDeal details

iD Mobile SIM Only on 5G 25GB (1 Month contract) with Unlimited mins…

iD Mobile
25 GBof 5G data
1 month contract
£6.00a month
£0.00 upfront
£6.00 total cost
  • No upfront cost
  • 5G
  • 1-month rolling
Buy now
at iD MobileDeal details

iD Mobile SIM Only on 5G 15GB (1 Month contract) with Unlimited mins…

iD Mobile
15 GBof 5G data
1 month contract
£6.00a month
£0.00 upfront
£6.00 total cost
  • No upfront cost
  • 5G
  • 1-month rolling
Buy now
at iD MobileDeal details

iD Mobile SIM Only on 5G 12GB (12 Month contract) with Unlimited mins…

iD Mobile
12 GBof 5G data
12 month contract
£6.00a month
£0.00 upfront
£72.00 total cost
  • No upfront cost
  • 5G
Buy now
at iD MobileDeal details

iD Mobile SIM Only on 5G 15GB (24 Month contract) with Unlimited mins…

iD Mobile
15 GBof 5G data
24 month contract
£6.00a month
£0.00 upfront
£144.00 total cost
  • No upfront cost
  • 5G
Buy now
at iD MobileDeal details

Mozillion 80GB SIM Only, 24-month

Mozillion
80 GBof 5G data
24 month contract
£3.00a month
£75.00 upfrontEffective £6.13/mo
£147.00 total cost
  • NEW
Buy now
at MozillionDeal details

O2 SIM Only on Classic (1 Month contract) with Unlimited mins & texts…

O2
10 GBof 5G data
1 month contract
£7.00a month
£0.00 upfront
£7.00 total cost
  • No upfront cost
  • 1-month rolling
Buy now
at O2 MobilesDeal details

iD Mobile SIM Only on 5G 25GB (1 Month contract) with Unlimited mins…

iD Mobile
25 GBof 5G data
1 month contract
£7.00a month
£0.00 upfront
£7.00 total cost
  • No upfront cost
  • 5G
  • 1-month rolling
Buy now
at iD MobileDeal details

O2 SIM Only on Classic (12 Month contract) with Unlimited mins & texts…

O2
10 GBof 5G data
12 month contract
£7.00a month
£0.00 upfront
£84.00 total cost
  • No upfront cost
Buy now
at O2 MobilesDeal details

iD Mobile SIM Only on 5G 15GB (12 Month contract) with Unlimited mins…

iD Mobile
15 GBof 5G data
12 month contract
£7.00a month
£0.00 upfront
£84.00 total cost
  • No upfront cost
  • 5G
Buy now
at iD MobileDeal details

iD Mobile SIM Only on 5G 25GB (12 Month contract) with Unlimited mins…

iD Mobile
25 GBof 5G data
12 month contract
£7.00a month
£0.00 upfront
£84.00 total cost
  • No upfront cost
  • 5G
Buy now
at iD MobileDeal details

iD Mobile SIM Only on 5G 15GB (12 Month contract) with Unlimited mins…

iD Mobile
15 GBof 5G data
12 month contract
£7.00a month
£0.00 upfront
£84.00 total cost
  • No upfront cost
  • 5G
Buy now
at iD MobileDeal details

iD Mobile SIM Only on 5G 10GB (12 Month contract) with Unlimited mins…

iD Mobile
10 GBof 5G data
12 month contract
£7.00a month
£0.00 upfront
£84.00 total cost
  • No upfront cost
  • 5G
Buy now
at iD MobileDeal details

iD Mobile SIM Only on 5G 5GB (12 Month contract) with Unlimited mins…

iD Mobile
5 GBof 5G data
12 month contract
£7.00a month
£0.00 upfront
£84.00 total cost
  • No upfront cost
  • 5G
Buy now
at iD MobileDeal details

Mozillion 3GB SIM Only, 24-month

Mozillion
3 GBof 5G data
24 month contract
£3.50a month
£84.00 upfrontEffective £7.00/mo
£168.00 total cost
  • NEW
Buy now
at MozillionDeal details

Mozillion 210GB SIM Only, 24-month

Mozillion
210 GBof 5G data
24 month contract
£3.50a month
£87.50 upfrontEffective £7.15/mo
£171.50 total cost
  • NEW
Buy now
at MozillionDeal details

Mozillion 3GB SIM Only, 12-month

Mozillion
3 GBof 5G data
12 month contract
£3.75a month
£45.00 upfrontEffective £7.50/mo
£90.00 total cost
  • NEW
Buy now
at MozillionDeal details

Mozillion 260GB SIM Only, 24-month

Mozillion
260 GBof 5G data
24 month contract
£3.75a month
£93.75 upfrontEffective £7.66/mo
£183.75 total cost
  • NEW
Buy now
at MozillionDeal details

giffgaff SIM Only on golden goodybag with Unlimited mins & texts…

giffgaff
5 GBof 5G data
No contract
£8.00a month
No mid-contract price rise£0.00 upfront
  • No upfront cost
  • No contract
Buy now
at giffgaffDeal details

giffgaff SIM Only on goodybag 4GB with Unlimited mins & texts…

giffgaff
4 GBof 5G data
No contract
£8.00a month
No mid-contract price rise£0.00 upfront
  • No upfront cost
  • No contract
Buy now
at giffgaffDeal details

O2 SIM Only on Classic (1 Month contract) with Unlimited mins & texts…

O2
50 GBof 5G data
1 month contract
£8.00a month
£0.00 upfront
£8.00 total cost
  • No upfront cost
  • 1-month rolling
Buy now
at O2 MobilesDeal details

iD Mobile SIM Only on 5G 50GB (12 Month contract) with Unlimited mins…

iD Mobile
50 GBof 5G data
12 month contract
£8.00a month
£0.00 upfront
£96.00 total cost
  • No upfront cost
  • 5G
Buy now
at iD MobileDeal details

Showing 24 of 161 deals

Switch services are provided at no cost to you, but we may receive a commission from the companies we refer you to. If a deal is “promoted” on Switch's tables, then it has been lent additional visibility as a result of us securing exclusivity on a great deal, or a commercial agreement to showcase what we believe to be market-leading value to consumers. Learn more about how our site works.

Until 2024, many mobile networks have increased contract prices in line with inflation. Starting in January 2025, Ofcom introduced a ban on inflation-linked price hikes for new contracts. Future price changes will need to be set and fully disclosed in pounds and pence.

*Switching from an ending 24-month handset contract to a SIM only contract. Average saving of £304 per year is based on the difference between a typical monthly handset contract cost and the cheapest available SIM only plan with an equivalent data allowance, calculated across 12 months as of March 2026. Individual savings will vary depending on your current contract and chosen SIM only deal.

The big four UK carriers

EE SIM-only deals→O2 SIM-only deals→Vodafone SIM-only deals→Three SIM-only deals→giffgaff SIM-only deals→

Every UK network we cover

O2 SIM-only plans→giffgaff SIM-only plans→iD Mobile SIM-only plans→Lebara SIM-only plans→Vodafone SIM-only plans→Three SIM-only plans→Tesco Mobile SIM-only plans→Talkmobile SIM-only plans→Sky Mobile SIM-only plans→EE SIM-only plans→VOXI SIM-only plans→SMARTY SIM-only plans→Spusu Mobile SIM-only plans→Honest Mobile SIM-only plans→Virgin Media SIM-only plans→

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Compare 5G SIM-only deals→Compare unlimited data SIM-only deals→Compare cheap SIM-only deals→Compare eSIM deals→Compare 1-month SIM-only deals→Compare 12-month SIM-only deals→

Compare SIM-only deals — questions

What is a SIM-only deal?

A SIM-only deal provides just a SIM card with a monthly allowance of minutes, texts and data, without a new handset. Contracts can be 1-month rolling, 12 months or 24 months.

Can I keep my phone number?