Mobile · Deals checked today
Cheapest SIM-only deals, checked today
The best-value SIM-only deal we found on 25 Oct 2026 is Sky Mobile 1GB at a real cost of £3.00 a month (1GB data · O2 network · 24 months). The table ranks 100 deals from 20 providers by real cost, with fees and stated price rises included.
Cheapest real cost
Sky Mobile 1GB
1GB data · O2 network · 24 months · £3.00 a month real cost
The lowest real cost here from a national provider on 25 Oct 2026, with fees and stated price rises counted.
The deals, best value first
Checked 25 Oct 2026| Provider and package | Data | Contract | Monthly price | Real cost | Deal |
|---|---|---|---|---|---|
Sky Mobile 1GB Roll spare data for up to a year · Change your data plan whenever you like | Data1GBO2 network · 5G | Contract24 monthsEU roaming extra | Monthly price£1.00£5.00 after 12 months | Real cost£3.00 /mo£72.00 over 24 months | See deal at Sky Mobile (opens in a new tab) |
Lyca Mobile UK Plan Smart Pay as you go bundle, no credit check · 100 international minutes included | Data5GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£3.50Price may change | Real cost£3.50 /mo£42.00 over 12 months | See deal at Lyca Mobile (opens in a new tab) |
spusu spusu 5 Unlimited minutes · Free number transfer | Data5GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£4.90Price may change | Real cost£4.90 /mo£58.80 over 12 months | See deal at spusu (opens in a new tab) |
Lyca Mobile National Plus Pay as you go bundle, no credit check · 100 international minutes included | Data30GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£5.00Price may change | Real cost£5.00 /mo£60.00 over 12 months | See deal at Lyca Mobile (opens in a new tab) |
Sky Mobile 10GB Roll spare data for up to a year · Change your data plan whenever you like | Data10GBO2 network · 5G | Contract24 monthsEU roaming extra | Monthly price£5.00Price may change | Real cost£5.00 /mo£120.00 over 24 months | See deal at Sky Mobile (opens in a new tab) |
Lebara 5GB 30-day plan No annual price rises · No credit check | Data5GBVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£5.00Price locked | Real cost£5.00 /mo£60.00 over 12 months | See deal at Lebara (opens in a new tab) |
1pMobile 5GB 30-day plan 5G included, no speed caps | Data5GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£5.00Price may change | Real cost£5.00 /mo£60.00 over 12 months | See deal at 1pMobile (opens in a new tab) |
Asda Mobile 3GB | Data3GBVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£5.00Price may change | Real cost£5.00 /mo£60.00 over 12 months | See deal at Asda Mobile (opens in a new tab) |
Talkmobile 10GB 30 days | Data10GBVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£5.95Price may change | Real cost£5.95 /mo£71.40 over 12 months | See deal at Talkmobile (opens in a new tab) |
iD Mobile 15GB 1 month plan No annual price rises · Roam in 50 destinations | Data15GBThree network · 5G | ContractNo contractEU roaming included | Monthly price£6.00Price locked | Real cost£6.00 /mo£72.00 over 12 months | See deal at iD Mobile (opens in a new tab) |
Smarty 5GB rolling monthly Wi-Fi calling · No annual price rises | Data5GBThree network · 5G | ContractNo contractEU roaming included | Monthly price£6.00Price locked | Real cost£6.00 /mo£72.00 over 12 months | See deal at Smarty (opens in a new tab) |
Talkmobile 30GB 30 days | Data30GBVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£6.95Price may change | Real cost£6.95 /mo£83.40 over 12 months | See deal at Talkmobile (opens in a new tab) |
Lyca Mobile UK Plan Super Extra Pay as you go bundle, no credit check · 100 international minutes included | Data75GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£7.50Price may change | Real cost£7.50 /mo£90.00 over 12 months | See deal at Lyca Mobile (opens in a new tab) |
spusu spusu 20 Unlimited minutes · Free number transfer | Data20GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£7.90Price may change | Real cost£7.90 /mo£94.80 over 12 months | See deal at spusu (opens in a new tab) |
Talkmobile 60GB 30 days | Data60GBVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£7.95Price may change | Real cost£7.95 /mo£95.40 over 12 months | See deal at Talkmobile (opens in a new tab) |
Tesco Mobile 2GB | Data2GBO2 network · 5G | Contract24 monthsEU roaming included | Monthly price£7.50£7.95 from 1 Apr 2027, then £8.42 | Real cost£7.95 /mo£190.92 over 24 months | See deal at Tesco Mobile (opens in a new tab) |
iD Mobile 36GB 1 month plan No annual price rises · Roam in 50 destinations | Data36GBThree network · 5G | ContractNo contractEU roaming included | Monthly price£8.00Price locked | Real cost£8.00 /mo£96.00 over 12 months | See deal at iD Mobile (opens in a new tab) |
Smarty 32GB rolling monthly (special offer) Wi-Fi calling · No annual price rises | Data32GBThree network · 5G | ContractNo contractEU roaming included | Monthly price£8.00Price locked | Real cost£8.00 /mo£96.00 over 12 months | See deal at Smarty (opens in a new tab) |
Asda Mobile 10GB | Data10GBVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£8.00Price may change | Real cost£8.00 /mo£96.00 over 12 months | See deal at Asda Mobile (opens in a new tab) |
Sky Mobile 5GB Roll spare data for up to a year · Change your data plan whenever you like | Data5GBO2 network · 5G | Contract24 monthsEU roaming extra | Monthly price£6.00£10.00 after 12 months | Real cost£8.00 /mo£192.00 over 24 months | See deal at Sky Mobile (opens in a new tab) |
giffgaff 5GB monthly rolling No credit checks | Data5GBO2 network · 5G | ContractNo contractEU roaming included | Monthly price£8.00Price may change | Real cost£8.00 /mo£96.00 over 12 months | See deal at giffgaff (opens in a new tab) |
Ecotalk 3GB No price rises · Ethical Consumer Best Buy | Data3GBEE network · 5G | ContractNo contractEU roaming extra | Monthly price£8.00Price locked | Real cost£8.00 /mo£96.00 over 12 months | See deal at Ecotalk (opens in a new tab) |
Your Co-op Mobile 3GB 30-day Change your data plan anytime · 30-day rolling contract, eSIM available | Data3GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£8.00Price may change | Real cost£8.00 /mo£96.00 over 12 months | See deal at Your Co-op Mobile (opens in a new tab) |
Talkmobile 100GB 12 months First 3 months half price | Data100GBVodafone network · 5G | Contract12 monthsEU roaming included | Monthly price£4.98£9.95 after 3 months | Real cost£8.71 /mo£104.49 over 12 months | See deal at Talkmobile (opens in a new tab) |
Talkmobile 100GB 30 days | Data100GBVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£9.95Price may change | Real cost£9.95 /mo£119.40 over 12 months | See deal at Talkmobile (opens in a new tab) |
Lyca Mobile UK Plan Mega Plus Pay as you go bundle, no credit check · 100 international minutes included | Data120GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£10.00Price may change | Real cost£10.00 /mo£120.00 over 12 months | See deal at Lyca Mobile (opens in a new tab) |
iD Mobile 100GB 24 month plan No annual price rises · Roam in 50 destinations | Data100GBThree network · 5G | Contract24 monthsEU roaming included | Monthly price£10.00Price locked | Real cost£10.00 /mo£240.00 over 24 months | See deal at iD Mobile (opens in a new tab) |
iD Mobile 90GB 12 month plan No annual price rises · Roam in 50 destinations | Data90GBThree network · 5G | Contract12 monthsEU roaming included | Monthly price£10.00Price locked | Real cost£10.00 /mo£120.00 over 12 months | See deal at iD Mobile (opens in a new tab) |
giffgaff 80GB 18 month plan No credit checks · No mid-contract price rises on 18 month contracts bought before the end of 2026 | Data80GBO2 network · 5G | Contract18 monthsEU roaming included | Monthly price£10.00Price locked | Real cost£10.00 /mo£180.00 over 18 months | See deal at giffgaff (opens in a new tab) |
1pMobile 50GB 30-day plan 5G included, no speed caps | Data50GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£10.00Price may change | Real cost£10.00 /mo£120.00 over 12 months | See deal at 1pMobile (opens in a new tab) |
Smarty 40GB rolling monthly Wi-Fi calling · No annual price rises | Data40GBThree network · 5G | ContractNo contractEU roaming included | Monthly price£10.00Price locked | Real cost£10.00 /mo£120.00 over 12 months | See deal at Smarty (opens in a new tab) |
Lebara 30GB 30-day plan No annual price rises · No credit check | Data30GBVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£10.00Price locked | Real cost£10.00 /mo£120.00 over 12 months | See deal at Lebara (opens in a new tab) |
VOXI £10 plan Price locked: stays at the same monthly price · Unlimited data for 7 social media apps | Data20GBVodafone network · 5G | ContractNo contractEU roaming extra | Monthly price£10.00Price locked | Real cost£10.00 /mo£120.00 over 12 months | See deal at VOXI (opens in a new tab) |
giffgaff 20GB monthly rolling No credit checks | Data20GBO2 network · 5G | ContractNo contractEU roaming included | Monthly price£10.00Price may change | Real cost£10.00 /mo£120.00 over 12 months | See deal at giffgaff (opens in a new tab) |
Asda Mobile 15GB | Data15GBVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£10.00Price may change | Real cost£10.00 /mo£120.00 over 12 months | See deal at Asda Mobile (opens in a new tab) |
Your Co-op Mobile 10GB 30-day Change your data plan anytime · 30-day rolling contract, eSIM available | Data10GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£10.00Price may change | Real cost£10.00 /mo£120.00 over 12 months | See deal at Your Co-op Mobile (opens in a new tab) |
Talkmobile 150GB 12 months First 3 months half price | Data150GBVodafone network · 5G | Contract12 monthsEU roaming included | Monthly price£5.97£11.95 after 3 months | Real cost£10.46 /mo£125.46 over 12 months | See deal at Talkmobile (opens in a new tab) |
Tesco Mobile 12GB | Data12GBO2 network · 5G | Contract12 monthsEU roaming included | Monthly price£11.00£11.66 from 1 Apr 2027 | Real cost£11.33 /mo£135.96 over 12 months | See deal at Tesco Mobile (opens in a new tab) |
Three 20GB Lite plan Three+ Rewards · Monthly price includes a £5 discount for paying by Direct Debit | Data20GBThree network · 5G | Contract24 monthsEU roaming included | Monthly price£10.00£11.90 from 1 Apr 2027, then £13.80 | Real cost£11.90 /mo£285.60 over 24 months | See deal at Three (opens in a new tab) |
Talkmobile 150GB 30 days | Data150GBVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£11.95Price may change | Real cost£11.95 /mo£143.40 over 12 months | See deal at Talkmobile (opens in a new tab) |
Smarty 140GB rolling monthly (special offer) Wi-Fi calling · No annual price rises | Data140GBThree network · 5G | ContractNo contractEU roaming included | Monthly price£12.00Price locked | Real cost£12.00 /mo£144.00 over 12 months | See deal at Smarty (opens in a new tab) |
iD Mobile 100GB 1 month plan No annual price rises · Roam in 50 destinations | Data100GBThree network · 5G | ContractNo contractEU roaming included | Monthly price£12.00Price locked | Real cost£12.00 /mo£144.00 over 12 months | See deal at iD Mobile (opens in a new tab) |
VOXI £12 plan (3x data offer) Price locked: stays at the same monthly price · 3x data offer: 75GB instead of 25GB until 26 November 2026 | Data75GBVodafone network · 5G | ContractNo contractEU roaming extra | Monthly price£12.00Price locked | Real cost£12.00 /mo£144.00 over 12 months | See deal at VOXI (opens in a new tab) |
giffgaff 50GB 18 month plan No credit checks · No mid-contract price rises on 18 month contracts bought before the end of 2026 | Data50GBO2 network · 5G | Contract18 monthsEU roaming included | Monthly price£12.00Price locked | Real cost£12.00 /mo£216.00 over 18 months | See deal at giffgaff (opens in a new tab) |
Sky Mobile 25GB Roll spare data for up to a year · Change your data plan whenever you like | Data25GBO2 network · 5G | Contract24 monthsEU roaming extra | Monthly price£10.00£14.00 after 12 months | Real cost£12.00 /mo£288.00 over 24 months | See deal at Sky Mobile (opens in a new tab) |
Ecotalk 10GB No price rises · Ethical Consumer Best Buy | Data10GBEE network · 5G | ContractNo contractEU roaming extra | Monthly price£12.00Price locked | Real cost£12.00 /mo£144.00 over 12 months | See deal at Ecotalk (opens in a new tab) |
Lyca Mobile UK Plan Unlimited Pay as you go bundle, no credit check · 100 international minutes included | DataUnlimitedEE network · 5G | ContractNo contractEU roaming included | Monthly price£12.50Price may change | Real cost£12.50 /mo£150.00 over 12 months | See deal at Lyca Mobile (opens in a new tab) |
Rewild Mobile 4GB 30-day 25% of net profits go to nature · Free eSIM, £4.99 for a physical SIM | Data4GBVodafone network | ContractNo contractEU roaming extra | Monthly price£12.50Price may change | Real cost£12.50 /mo£150.00 over 12 months | See deal at Rewild Mobile (opens in a new tab) |
spusu spusu 80 Unlimited minutes · Free number transfer | Data80GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£12.90Price may change | Real cost£12.90 /mo£154.80 over 12 months | See deal at spusu (opens in a new tab) |
Tesco Mobile 30GB | Data30GBO2 network · 5G | Contract24 monthsEU roaming included | Monthly price£12.50£13.25 from 1 Apr 2027, then £14.04 | Real cost£13.26 /mo£318.24 over 24 months | See deal at Tesco Mobile (opens in a new tab) |
Ecotalk 30GB No price rises · Ethical Consumer Best Buy | Data30GBEE network · 5G | ContractNo contractEU roaming extra | Monthly price£14.00Price locked | Real cost£14.00 /mo£168.00 over 12 months | See deal at Ecotalk (opens in a new tab) |
Your Co-op Mobile 30GB 30-day Change your data plan anytime · 30-day rolling contract, eSIM available | Data30GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£14.00Price may change | Real cost£14.00 /mo£168.00 over 12 months | See deal at Your Co-op Mobile (opens in a new tab) |
Chattr Freedom One Unlimited No credit checks · Price drops to £14 from month 6 and £13 from month 12 | DataUnlimitedO2 network · 5G | ContractNo contractEU roaming included | Monthly price£15.00£14.00 after 5 months, then £13.00 | Real cost£14.33 /mo£172.00 over 12 months | See deal at Chattr (opens in a new tab) |
giffgaff 100GB 18 month plan No credit checks · No mid-contract price rises on 18 month contracts bought before the end of 2026 | Data100GBO2 network · 5G | Contract18 monthsEU roaming included | Monthly price£15.00Price locked | Real cost£15.00 /mo£270.00 over 18 months | See deal at giffgaff (opens in a new tab) |
1pMobile 100GB 30-day plan 5G included, no speed caps | Data100GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£15.00Price may change | Real cost£15.00 /mo£180.00 over 12 months | See deal at 1pMobile (opens in a new tab) |
Lebara 50GB 30-day plan No annual price rises · No credit check | Data50GBVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£15.00Price locked | Real cost£15.00 /mo£180.00 over 12 months | See deal at Lebara (opens in a new tab) |
VOXI £15 plan Price locked: stays at the same monthly price · Unlimited data for social media, music and video apps | Data35GBVodafone network · 5G | ContractNo contractEU roaming extra | Monthly price£15.00Price locked | Real cost£15.00 /mo£180.00 over 12 months | See deal at VOXI (opens in a new tab) |
EE 50GB SIM Gift data to your family · Flash sale price, ends 5 November 2026 | Data50GBEE network · 5G | Contract24 monthsEU roaming extra | Monthly price£13.00£15.50 from 31 Mar 2027, then £18.00 | Real cost£15.50 /mo£372.00 over 24 months | See deal at EE (opens in a new tab) |
Rewild Mobile 10GB 12-month 25% of net profits go to nature · Free eSIM, £4.99 for a physical SIM | Data10GBVodafone network | Contract12 monthsEU roaming extra | Monthly price£15.50Price locked | Real cost£15.50 /mo£186.00 over 12 months | See deal at Rewild Mobile (opens in a new tab) |
Tesco Mobile 60GB | Data60GBO2 network · 5G | Contract24 monthsEU roaming included | Monthly price£15.00£15.90 from 1 Apr 2027, then £16.85 | Real cost£15.91 /mo£381.90 over 24 months | See deal at Tesco Mobile (opens in a new tab) |
Three 120GB Lite plan Three+ Rewards · Monthly price includes a £5 discount for paying by Direct Debit | Data120GBThree network · 5G | Contract24 monthsEU roaming included | Monthly price£8.00£18.30 from 1 Apr 2027, then £20.60 | Real cost£16.30 /mo£391.20 over 24 months | See deal at Three (opens in a new tab) |
Rewild Mobile 10GB 30-day 25% of net profits go to nature · Free eSIM, £4.99 for a physical SIM | Data10GBVodafone network | ContractNo contractEU roaming extra | Monthly price£16.50Price may change | Real cost£16.50 /mo£198.00 over 12 months | See deal at Rewild Mobile (opens in a new tab) |
iD Mobile Unlimited 24 month plan No annual price rises · Roam in 50 destinations | DataUnlimitedThree network · 5G | Contract24 monthsEU roaming included | Monthly price£17.00Price locked | Real cost£17.00 /mo£408.00 over 24 months | See deal at iD Mobile (opens in a new tab) |
Smarty 200GB rolling monthly Wi-Fi calling · No annual price rises | Data200GBThree network · 5G | ContractNo contractEU roaming included | Monthly price£17.00Price locked | Real cost£17.00 /mo£204.00 over 12 months | See deal at Smarty (opens in a new tab) |
Sky Mobile 50GB Roll spare data for up to a year · Change your data plan whenever you like | Data50GBO2 network · 5G | Contract24 monthsEU roaming extra | Monthly price£17.00Price may change | Real cost£17.00 /mo£408.00 over 24 months | See deal at Sky Mobile (opens in a new tab) |
Asda Mobile 100GB | Data100GBVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£18.00Price may change | Real cost£18.00 /mo£216.00 over 12 months | See deal at Asda Mobile (opens in a new tab) |
Your Co-op Mobile 100GB 30-day Change your data plan anytime · 30-day rolling contract, eSIM available | Data100GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£18.00Price may change | Real cost£18.00 /mo£216.00 over 12 months | See deal at Your Co-op Mobile (opens in a new tab) |
Sky Mobile 75GB Roll spare data for up to a year · Change your data plan whenever you like | Data75GBO2 network · 5G | Contract24 monthsEU roaming extra | Monthly price£14.00£22.00 after 12 months | Real cost£18.00 /mo£432.00 over 24 months | See deal at Sky Mobile (opens in a new tab) |
EE 100GB SIM Gift data to your family · Flash sale price, ends 5 November 2026 | Data100GBEE network · 5G | Contract24 monthsEU roaming extra | Monthly price£17.00£19.50 from 31 Mar 2027, then £22.00 | Real cost£19.50 /mo£468.00 over 24 months | See deal at EE (opens in a new tab) |
iD Mobile Unlimited 1 month plan No annual price rises · Roam in 50 destinations | DataUnlimitedThree network · 5G | ContractNo contractEU roaming included | Monthly price£20.00Price locked | Real cost£20.00 /mo£240.00 over 12 months | See deal at iD Mobile (opens in a new tab) |
Smarty Unlimited rolling monthly Wi-Fi calling · No annual price rises | DataUnlimitedThree network · 5G | ContractNo contractEU roaming included | Monthly price£20.00Price locked | Real cost£20.00 /mo£240.00 over 12 months | See deal at Smarty (opens in a new tab) |
VOXI £20 plan (3x data offer) Price locked: stays at the same monthly price · 3x data offer: 300GB instead of 100GB until 26 November 2026 | Data300GBVodafone network · 5G | ContractNo contractEU roaming extra | Monthly price£20.00Price locked | Real cost£20.00 /mo£240.00 over 12 months | See deal at VOXI (opens in a new tab) |
1pMobile 200GB 30-day plan 5G included, no speed caps | Data200GBEE network · 5G | ContractNo contractEU roaming included | Monthly price£20.00Price may change | Real cost£20.00 /mo£240.00 over 12 months | See deal at 1pMobile (opens in a new tab) |
Lebara 100GB 30-day plan No annual price rises · No credit check | Data100GBVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£20.00Price locked | Real cost£20.00 /mo£240.00 over 12 months | See deal at Lebara (opens in a new tab) |
giffgaff 100GB monthly rolling No credit checks | Data100GBO2 network · 5G | ContractNo contractEU roaming included | Monthly price£20.00Price may change | Real cost£20.00 /mo£240.00 over 12 months | See deal at giffgaff (opens in a new tab) |
Tesco Mobile 100GB | Data100GBO2 network · 5G | Contract12 monthsEU roaming included | Monthly price£20.00£21.20 from 1 Apr 2027 | Real cost£20.60 /mo£247.20 over 12 months | See deal at Tesco Mobile (opens in a new tab) |
Rewild Mobile Unlimited 24-month 25% of net profits go to nature · Free eSIM, £4.99 for a physical SIM | DataUnlimitedVodafone network | Contract24 monthsEU roaming extra | Monthly price£21.25Price locked | Real cost£21.25 /mo£510.00 over 24 months | See deal at Rewild Mobile (opens in a new tab) |
Rewild Mobile Unlimited 12-month 25% of net profits go to nature · Free eSIM, £4.99 for a physical SIM | DataUnlimitedVodafone network | Contract12 monthsEU roaming extra | Monthly price£21.50Price locked | Real cost£21.50 /mo£258.00 over 12 months | See deal at Rewild Mobile (opens in a new tab) |
Asda Mobile Unlimited data | DataUnlimitedVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£22.00Price may change | Real cost£22.00 /mo£264.00 over 12 months | See deal at Asda Mobile (opens in a new tab) |
Ecotalk Unlimited data No price rises · Ethical Consumer Best Buy | DataUnlimitedEE network · 5G | ContractNo contractEU roaming extra | Monthly price£22.00Price locked | Real cost£22.00 /mo£264.00 over 12 months | See deal at Ecotalk (opens in a new tab) |
Rewild Mobile Unlimited 30-day 25% of net profits go to nature · Free eSIM, £4.99 for a physical SIM | DataUnlimitedVodafone network | ContractNo contractEU roaming extra | Monthly price£22.50Price may change | Real cost£22.50 /mo£270.00 over 12 months | See deal at Rewild Mobile (opens in a new tab) |
O2 100GB Classic Plan Offer price ends 4 November 2026 | Data100GBO2 network · 5G | Contract24 monthsEU roaming included | Monthly price£20.00£22.50 from 1 Apr 2027, then £25.00 | Real cost£22.50 /mo£540.00 over 24 months | See deal at O2 (opens in a new tab) |
Sky Mobile Unlimited Roll spare data for up to a year · Change your data plan whenever you like | DataUnlimitedO2 network · 5G | Contract24 monthsEU roaming extra | Monthly price£21.00£25.00 after 12 months | Real cost£23.00 /mo£552.00 over 24 months | See deal at Sky Mobile (opens in a new tab) |
Tesco Mobile 250GB | Data250GBO2 network · 5G | Contract24 monthsEU roaming included | Monthly price£22.50£23.85 from 1 Apr 2027, then £25.28 | Real cost£23.87 /mo£572.88 over 24 months | See deal at Tesco Mobile (opens in a new tab) |
Your Co-op Mobile Unlimited data 30-day Change your data plan anytime · 30-day rolling contract, eSIM available | DataUnlimitedEE network · 5G | ContractNo contractEU roaming included | Monthly price£24.00Price may change | Real cost£24.00 /mo£288.00 over 12 months | See deal at Your Co-op Mobile (opens in a new tab) |
Three Unlimited Lite plan Three+ Rewards · Monthly price includes a £5 discount for paying by Direct Debit | DataUnlimitedThree network · 5G | Contract24 monthsEU roaming included | Monthly price£22.00£24.30 from 1 Apr 2027, then £26.60 | Real cost£24.30 /mo£583.20 over 24 months | See deal at Three (opens in a new tab) |
giffgaff Unlimited 18 month plan No credit checks · No mid-contract price rises on 18 month contracts bought before the end of 2026 | DataUnlimitedO2 network · 5G | Contract18 monthsEU roaming included | Monthly price£25.00Price locked | Real cost£25.00 /mo£450.00 over 18 months | See deal at giffgaff (opens in a new tab) |
Lebara Unlimited data 30-day plan No annual price rises · No credit check | DataUnlimitedVodafone network · 5G | ContractNo contractEU roaming included | Monthly price£25.00Price locked | Real cost£25.00 /mo£300.00 over 12 months | See deal at Lebara (opens in a new tab) |
1pMobile Unlimited data 30-day plan 5G included, no speed caps · Extra SIMs half price (£12.50) | DataUnlimitedEE network · 5G | ContractNo contractEU roaming included | Monthly price£25.00Price may change | Real cost£25.00 /mo£300.00 over 12 months | See deal at 1pMobile (opens in a new tab) |
O2 Unlimited Classic Plan Offer price ends 4 November 2026 | DataUnlimitedO2 network · 5G | Contract24 monthsEU roaming included | Monthly price£23.00£25.50 from 1 Apr 2027, then £28.00 | Real cost£25.50 /mo£612.00 over 24 months | See deal at O2 (opens in a new tab) |
EE Unlimited Essentials Plus Max Gift data to your family · Unlimited data for your watch | DataUnlimitedEE network · 5G | Contract24 monthsEU roaming included | Monthly price£26.00£28.50 from 31 Mar 2027, then £31.00 | Real cost£28.50 /mo£684.00 over 24 months | See deal at EE (opens in a new tab) |
Vodafone Unlimited Plus Speed: maximum download 100 Mbps | DataUnlimitedVodafone network · 5G | Contract24 monthsEU roaming included | Monthly price£26.00£28.50 from 1 Apr 2027, then £31.00 | Real cost£28.50 /mo£684.00 over 24 months | See deal at Vodafone (opens in a new tab) |
O2 100GB Ultimate Plan Ultimate plan with 8 benefits | Data100GBO2 network · 5G | Contract24 monthsEU roaming included | Monthly price£26.99£29.49 from 1 Apr 2027, then £31.99 | Real cost£29.49 /mo£707.76 over 24 months | See deal at O2 (opens in a new tab) |
Tesco Mobile Unlimited data | DataUnlimitedO2 network · 5G | Contract12 monthsEU roaming included | Monthly price£30.00£31.80 from 1 Apr 2027 | Real cost£30.90 /mo£370.80 over 12 months | See deal at Tesco Mobile (opens in a new tab) |
O2 Unlimited Ultimate Plan Ultimate plan with 7 benefits | DataUnlimitedO2 network · 5G | Contract24 monthsEU roaming included | Monthly price£29.99£32.49 from 1 Apr 2027, then £34.99 | Real cost£32.49 /mo£779.76 over 24 months | See deal at O2 (opens in a new tab) |
VOXI Unlimited Price locked: stays at the same monthly price | DataUnlimitedVodafone network · 5G | ContractNo contractEU roaming extra | Monthly price£35.00Price locked | Real cost£35.00 /mo£420.00 over 12 months | See deal at VOXI (opens in a new tab) |
giffgaff Unlimited monthly rolling No credit checks | DataUnlimitedO2 network · 5G | ContractNo contractEU roaming included | Monthly price£35.00Price may change | Real cost£35.00 /mo£420.00 over 12 months | See deal at giffgaff (opens in a new tab) |
EE Unlimited All Rounder Gift data to your family · 5G+ up to 45% faster than 5G | DataUnlimitedEE network · 5G | Contract24 monthsEU roaming included | Monthly price£33.00£35.50 from 31 Mar 2027, then £38.00 | Real cost£35.50 /mo£852.00 over 24 months | See deal at EE (opens in a new tab) |
Vodafone Unlimited Speed: maximum download 100 Mbps | DataUnlimitedVodafone network · 5G | Contract24 monthsEU roaming extra | Monthly price£35.00£37.50 from 1 Apr 2027, then £40.00 | Real cost£37.50 /mo£900.00 over 24 months | See deal at Vodafone (opens in a new tab) |
EE Unlimited Full Works Gift data to your family · 5G+ up to 45% faster than 5G | DataUnlimitedEE network · 5G | Contract24 monthsEU roaming included | Monthly price£43.00£45.50 from 31 Mar 2027, then £48.00 | Real cost£45.50 /mo£1,092.00 over 24 months | See deal at EE (opens in a new tab) |
AffiliateRanked by real cost; commission never changes the order. How we make money. Prices checked on each provider's own site on 25 Oct 2026.
How to pay less for your SIM
Pick your data before you pick a deal. Check how much you use each month in your phone's settings, then choose a plan with a little spare. Our mobile data calculator can help if you are unsure. Paying for data you never use is the easiest way to overpay.
Every UK SIM-only brand runs on EE, O2, Vodafone or Three. Brands on the same network share its coverage. So a cheaper brand on a big network can give you the same signal for less.
Compare deals by real cost, not the headline price. Real cost adds every monthly price, every stated price rise and any setup fee, then takes off the cash value of any reward. Sort the table by real cost to start. We rank by real cost only, and commission never changes the order.
Cheap SIM traps
Watch for four traps before you pay.
- Short promos: a low first price can cost more over the contract. Real cost counts every month.
- Price rises: providers must state any rise in pounds and pence when you sign up. Percentage and inflation-linked rises are banned in new contracts.
- Roaming and speed limits: ask about using your phone abroad and any speed cap before you buy.
- Tie-ins: a 12 or 24-month plan costs less up front but ties you in. A 30-day SIM lets you leave with a month's notice.
Sorting by real cost shows the true monthly cost of each deal, but not roaming fees or speed caps.
Switch in a day and keep your number
To keep your number, text PAC to 65075 to get your PAC code. Give that code to your new network when you sign up. Your new network then does the rest.
Your number moves across in one working day. Once it moves, your new SIM uses your old number.
Don't want to keep your number? Text STAC to 75075 to leave without it.
Straight answers
Questions people ask
- What is the cheapest SIM-only deal?
- The cheapest SIM-only deal is the one with the lowest real cost in our table. Real cost adds up every monthly price, every stated price rise and any setup fee, then takes off the cash value of any reward. Each table shows the date its prices were last checked, so you can see how current the ranking is.
- Is a cheap SIM worse?
- No, not on coverage. Every UK SIM-only brand runs on one of four networks: EE, O2, Vodafone or Three. Brands on the same network share its coverage, so a cheap SIM can reach the same places as a dearer one on that network. Check which network a deal uses before you sign.
- Can I keep my number on a cheap SIM?
- Yes, you can keep your number when you switch to a cheap SIM. Text PAC to 65075 for your code, give it to your new network, and your number moves in one working day. If you would rather leave without keeping your number, text STAC to 75075 instead.