The best SIM-only deals in the UK in 2026
The cheapest unlimited data is Chattr's Freedom One at £15 a month, falling to £13 after a year. The cheapest first month is Lyca Mobile at 50% off — unlimited for £12.50. For the most data at a low standard price, 1pMobile's 50GB for £10 on EE wins; for calls abroad and India roaming, Lebara from £4.50 on 12 months; and VOXI pays up to £20 in gift cards (£40 until 7 October 2026) for joining. None of them needs a code: every deal here opens straight from its HonestCodes link.
Key takeaways
- Cheapest unlimited: Chattr Freedom One, £15 a month, then £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 £10: 1pMobile 50GB with unlimited calls and texts on EE; 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 — £40 during Double Rewards to 7 October 2026.
| Chattr | Lyca Mobile | 1pMobile | Lebara | VOXI | |
|---|---|---|---|---|---|
| Network | O2 or Vodafone | EE | EE | Vodafone | Vodafone |
| New-customer deal | Unlimited £15, falling to £13 | 50% off the first 30 days | SIM £5 with £10 of credit | 10% off every 12-month plan | Up to £20 gift card (£40 to 7 Oct) |
| Cheapest plan | 6GB £10 | 30GB £5 in month one | 5GB £5 | 5GB £4.50 on 12 months | £10 plan |
| Unlimited data | £15, then £13 | £12.50 in month one | £25; extra SIMs £12.50 | £25, or £22.50 on 12 months | £35 |
| Roaming included | 43 European destinations | EU | 46 European destinations | EU and India, up to 30GB | Roaming Pass sold separately |
| Deal link | honestcodes.co.uk/go/chattr | honestcodes.co.uk/go/lyca-mobile | honestcodes.co.uk/go/1pmobile | honestcodes.co.uk/go/lebara | join.voxi.co.uk/LTYEql |
The right SIM for how you use your phone
Streaming, hotspotting or a teenager's phone: Chattr's Freedom One. Unlimited 5G data for £15 is 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: 1pMobile. 50GB with unlimited calls and texts for £10 on EE 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 on 23 September 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 and VOXI on Vodafone; Chattr sells on O2 and Vodafone. If one network is strongest where you live and work, start with the brands that use it.
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. For the first month alone, Lyca Mobile's 50% off makes its unlimited plan £12.50.
Do I need a promo code for these SIM deals?
No. Each deal opens straight from its HonestCodes link — Chattr, Lyca Mobile, 1pMobile and Lebara at 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 five sell rolling 30-day SIM-only plans with no credit check; Lebara and Lyca also offer longer terms for a lower monthly price.
Keep reading
Verified against each brand's own terms · 23 September 2026