The best SIM-only deals in the UK in 2026
The cheapest unlimited data is Chattr's Freedom One: £3.75 for the first month with our exclusive code HONEST75, then £15 a month, falling to £13 after a year. Lyca Mobile's 50% off makes its unlimited plan £12.50 for the first 30 days. For the most data at a low price, Talkmobile's 100GB on Vodafone wins: £4.98 a month for the first 3 months of a 12-month plan, then £9.95; on EE, 1pMobile's 50GB for £10; for calls abroad and India roaming, Lebara from £4.50 on 12 months; and VOXI pays up to £20 in gift cards for joining. None of them needs a code: every deal here opens straight from its HonestCodes link.
Key takeaways
- Cheapest unlimited: Chattr Freedom One, £3.75 in month one with HonestCodes-exclusive HONEST75, then £15, £14 and £13 from month 12 — O2 or Vodafone network.
- Cheapest first month: Lyca Mobile, 50% off the first 30 days — 30GB for £5, unlimited for £12.50, on EE.
- Most data for under £10: Talkmobile 100GB on Vodafone, £4.98 a month for 3 months on 12 months then £9.95, or £9.95 on a 30-day plan.
- Best EE value: 1pMobile 50GB with unlimited calls and texts for £10; its £5 SIM comes loaded with £10 of credit.
- Best for calling abroad: Lebara on Vodafone, with international minutes and EU and India roaming on every plan, from £4.50 on 12 months.
- Best sign-up reward: VOXI, up to £20 in gift cards after two paid months.
| Chattr | Talkmobile | Lyca Mobile | 1pMobile | Lebara | VOXI | |
|---|---|---|---|---|---|---|
| Network | O2 or Vodafone | Vodafone (and Three) | EE | EE | Vodafone | Vodafone |
| New-customer deal | 75% off month one with HONEST75 (HonestCodes exclusive) | First 3 months half price on 12 months | 50% off the first 30 days | Free 50GB boost with our code; SIM £5 with £10 of credit | 50% off any plan for 3 months with our code | Up to £20 gift card |
| Cheapest plan | Freedom One, the one plan: £3.75 in month one, then £15 | 100GB £4.98 for 3 months (12 months); 30-day from £5.95 | 30GB £5 in month one | 5GB £5 | 5GB £4.50 on 12 months | £10 plan |
| Unlimited data | £3.75 in month one, then £15 falling to £13 | No unlimited plan; 150GB £5.97 for 3 months, then £11.95 | £12.50 in month one | £25; extra SIMs £12.50 | £25, or £22.50 on 12 months | £35 |
| Roaming included | 43 European destinations | 47 European destinations (5GB fair use) | EU | 46 European destinations | EU and India, up to 30GB | Roaming Pass sold separately |
| Deal link | our Chattr link | our Talkmobile link | our Lyca Mobile link | our 1pMobile link | our Lebara link | our VOXI link |
The right SIM for how you use your phone
Streaming, hotspotting or a teenager's phone: Chattr's Freedom One. Unlimited 5G data costs £3.75 for the first month with our exclusive code HONEST75, then £15, already below most networks' capped plans, and it is the only plan here whose price goes down the longer you keep it: £13 a month from month 12.
Switching and want the lowest first bill: Lyca Mobile. Its 50% off is priced onto the plan for the first 30 days, so 30GB is £5 and unlimited £12.50 before the standard price applies.
Big data on a small budget: Talkmobile. 100GB on Vodafone for £4.98 a month for the first 3 months of a 12-month plan, then £9.95, about 10p a gigabyte at full price, with roaming in 47 European destinations, Wi-Fi calling, eSIM and no credit check.
Big data on EE: 1pMobile. 50GB with unlimited calls and texts for £10 works out at 20p a gigabyte, and a household can add unlimited SIMs at £12.50 each.
Family overseas or regular trips to India: Lebara. Every plan carries international minutes to more than 50 countries and roaming in the EU and India, and committing for 12 months takes 10% off.
Heavy social media, or you want cash back for switching: VOXI. Social apps do not touch your data allowance, and joining through a referral pays a gift card after two paid months.
How these deals were checked
Every price and allowance on this page was read on the network's own website (23 September 2026; Talkmobile on 2 October 2026) and matches that network's full HonestCodes page, where the plans, terms and sources are set out in detail. Unlike coupon lists that recycle codes long after they expire, none of these deals depends on a code: each one opens straight from its link, and HonestCodes tests those links daily.
Which network is behind each brand
SIM-only brands borrow a big network's masts. Lyca Mobile and 1pMobile run on EE; Lebara, VOXI and Talkmobile on Vodafone (Talkmobile also lists access to Three); Chattr sells on O2 and Vodafone. If one network is strongest where you live and work, start with the brands that use it.
More SIM-only deals: Rewild Mobile, Ecotalk and Your Co-op
Rewild Mobile: a 4GB Everyday SIM from £11.25 a month on a 24-month term, fixed with no mid-contract rises, and unlimited UK calls and texts. Deal link: honestcodes.co.uk/go/rewild-mobile (page: our Rewild Mobile UK page).
Ecotalk: 100GB for £12 a month for your first 3 months (normally £18), or unlimited data for £11 in your first month (then £22). SIM-only on a 30-day rolling contract with unlimited UK calls and texts and 5G as standard. Deal link: honestcodes.co.uk/go/ecotalk (page: our Ecotalk page).
Your Co-op Broadband & Mobile: join as a member for free and get your first month free plus a £5 to £25 welcome reward on SIM plans, which are 30-day rolling. Deal link: honestcodes.co.uk/go/your-co-op-broadband-mobile (page: our Your Co-op Broadband & Mobile page).
Fonehouse: £30 off the upfront cost of any deal, phone contracts and SIM-only alike, with the HonestCodes-exclusive code 30OFFHCD, typed in the basket. Subject to credit check; monthly prices may rise during contract. Deal link: honestcodes.co.uk/go/fonehouse (page: honestcodes.co.uk/codes/fonehouse).
Frequently asked questions
What is the cheapest unlimited SIM-only deal in the UK?
Chattr's Freedom One: unlimited 5G data, calls and texts for £15 a month, falling to £13 from month 12 — and just £3.75 for the first month with HonestCodes-exclusive code HONEST75.
Do I need a promo code for these SIM deals?
Only for Chattr: enter our exclusive code HONEST75 at checkout for 75% off the first month. Lebara and 1pMobile have codes too, revealed on their HonestCodes pages: 50% off any Lebara plan for 3 months, and a free 50GB data boost on 1pMobile. Talkmobile and Lyca Mobile open straight from honestcodes.co.uk/go/<network>, and VOXI through its referral link.
Which SIM-only deal is best for calling abroad?
Lebara. Every plan includes international minutes to more than 50 countries, the 100GB and Unlimited Plus plans make them unlimited, and your UK allowance works in the EU and India at no extra cost, up to 30GB.
Can I keep my number when I switch?
Yes, on every network here. Text PAC to 65075 from your current phone, then give the PAC to your new network when you activate the SIM.
Do any of these need a credit check or a contract?
No. All six sell rolling 30-day SIM-only plans with no credit check; Lebara and Lyca also offer longer terms for a lower monthly price, and Talkmobile's 12-month plans start half price for 3 months.
All codes
| Brand | Offer | Code | Link |
|---|---|---|---|
| Chattr | 75% off your first month: unlimited for £3.75 | Code: HONEST75 | Get the deal at Chattr |
| Talkmobile | First 3 months half price, 100GB from £4.98 | Code: No code needed | Get the deal at Talkmobile |
| Lyca Mobile | 50% off your first month | Code: No code needed | Get the deal at Lyca Mobile |
| 1pMobile | Free 50GB data boost + SIM for £5 | Code: Reveal above | Get the deal at 1pMobile |
| Lebara | 50% off for 3 months | Code: Reveal above | Get the deal at Lebara |
| VOXI | Up to £20 gift card | Code: No code needed | Claim offer at VOXI |
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Reference
Every referral & cashback term, defined
Verified against each brand's own terms · 9 November 2026 · Checked by Bez, Editor-in-Chief
