Best SIM only deals UK 2026: unlimited data from £3.75 and 30GB for £5, side by side
Chattr has the cheapest unlimited start at £3.75 for month one with its code. Talkmobile gives 100GB at £4.98 a month for three months. Lebara halves any plan for three months, so 30GB is £5. Ecotalk and Lyca Mobile put unlimited data at £11 and £12.50 for month one. VOXI pays you a gift card of £10 to £20 on top of a plan from £10 a month.
Lebara code
50% off any SIM-only plan for 3 months
Half Price Offer: 50% off any Lebara SIM-only plan for the first 3 months, then the full plan price applies.
Revealing a code takes you to Lebara through our affiliate link. TopReferrals may earn a commission, at no extra cost to you and with no change to your reward.
Carphone Warehouse code
£10 off the upfront cost of Pay Monthly handsets
Carphone Warehouse's own partner offer of 22 October 2026: £10 off the upfront cost of Pay Monthly handsets. Carphone Warehouse's promotion terms apply.
Revealing a code takes you to Carphone Warehouse through our affiliate link. TopReferrals may earn a commission, at no extra cost to you and with no change to your reward.
1pMobile code
Free £5 top-up credit
Free £5 top-up credit (applied when SIM activated)
Revealing a code takes you to 1pMobile through our affiliate link. TopReferrals may earn a commission, at no extra cost to you and with no change to your reward.
Up to £20 gift card
75% off month one: unlimited for £3.75
100GB for £4.98 a month, first 3 months
Up to £50 iD Mobile cashback plus free next-day delivery
50% off any SIM-only plan for your first 3 months
Half price first 30 days: 30GB for £5, no credit check
4GB SIM from £11.25/month, fixed price on 24 months
£5 Classic PAYG SIM, loaded with £10 credit
Unlimited data for £11 in your first month
Free delivery by next day, seven days a week
Key takeaways
- Chattr: 75% off month one with code HONEST75, so unlimited 5G is £3.75, then £15 falling to £13 by month 12. No contract, no credit check.
- Talkmobile: 100GB of 5G at £4.98 a month for the first 3 months of a 12-month plan, then £9.95. No credit check.
- Lebara: 50% off any SIM-only plan for 3 months, so 30GB is £5 instead of £10.
- Lyca Mobile and Ecotalk: half-price and £11 first months, with unlimited data from £12.50 and £11.
- VOXI: a £10, £15 or £20 gift card by plan, paid after two monthly payments, with no promo code.
Our pick here: VOXI pays Up to £20, verified against its own terms.
A SIM-only plan gives you data, calls and texts without a handset, and the best ones cost less than a takeaway a month. Nine UK deals are verified here. Each page shows you the exact first-month price, what it becomes, and how to claim it.
Chattr: the cheapest unlimited start
Chattr takes 75% off your first month on any plan with code HONEST75. That turns unlimited 5G data, calls and texts on Freedom One into £3.75. From month two it is £15, then £14, then £13 from month 12.
There is no contract and no credit check, and roaming covers 43 European destinations. Open https://topreferrals.co.uk/go/chattr, choose a plan, and type the code at checkout.
Take it if: you want unlimited data from day one at the lowest start price.
Talkmobile: 100GB for under £5
Talkmobile sells 100GB of 5G data with unlimited minutes and texts at £4.98 a month for the first 3 months of a 12-month plan, then £9.95. It runs on the Vodafone network, with roaming in 47 European destinations and no credit check. 30-day plans start at £5.95 and leave with 30 days' notice.
Take it if: you want lots of data and a low price for a quarter.
Lebara: half price on any plan
Lebara takes 50% off any SIM-only plan for your first 3 months. The 30GB plan costs £5 instead of £10, and the 5GB plan £2.50 instead of £5. There is no credit check and no annual price rise. You need an unlocked phone, and a promo code is revealed on Lebara's page.
Take it if: you want a mid-size plan at a flat half price.
Lyca Mobile and Ecotalk: half-price and £11 starts
Lyca Mobile halves its 30-day plans in the first month: 30GB for £5, 120GB for £10 and unlimited for £12.50, with no contract or credit check. Ecotalk charges £11 for unlimited data in month one, then £22, or 100GB at £12 a month for 3 months against £18 normally. Both run on 30-day terms.
Take it if: you want a big plan for one cheap month and are happy to move on after.
VOXI: a gift card on top of your plan
VOXI pays you a gift card instead of a discount. Join through https://topreferrals.co.uk/go/voxi on a plan of £10 a month or more, pay for two months within 60 days, and VOXI sends £10, £15 or £20 by plan. The £20 plan reaches the top tier. Pick Amazon.co.uk, Just Eat or PayPal cash. Use no promo code at checkout, because VOXI's terms say one, including the student code, invalidates the referral.
Take it if: you plan to stay for at least two months and want the reward.
More SIM routes worth a look
- Rewild Mobile: a 4GB Everyday SIM at £11.25 a month, fixed on 24 months, with unlimited UK calls and texts and a free eSIM.
- Carphone Warehouse: iD Mobile's Unlimited 12-month plan at £15.00 a month shows £50 cashback, and other SIM-only plans list cashback from £12 to £110, with free next-day delivery on orders placed before 8pm.
- 1pMobile: a Classic pay-as-you-go SIM for £5 with £10 credit.
- Fonehouse: free next-day delivery seven days a week, and SIM-only 60GB 5G plans that add £120 cashback.
- Your Co-op Broadband & Mobile: a free first month plus £5 to £25 on SIM plans for new members.
How to choose a SIM-only deal
- Data you use. 5GB suits light use. 30GB to 100GB covers most. Unlimited suits hotspots and streaming.
- How long the cheap price lasts. Month one, three months or a fixed term: add up the first year, not just the headline.
- The price after. Every intro price ends, so find the plan you would pay in month four.
- The contract. 30-day plans let you switch again, while 12 and 24-month plans lock the price.
- Credit check and phone. Most deals here skip the credit check, and you need an unlocked phone.
Our verdict
Chattr for the cheapest unlimited month, Talkmobile for the most data per pound, Lebara for a flat half-price start, and VOXI when you want a gift card for staying. Because most plans here run on 30 days, you can claim one, then move to the next.
Mobile sign-ups also appear in our Chattr vs VOXI comparison and the VOXI referral verdict.
Side by side
| Chattr | Talkmobile | Lebara | Lyca Mobile | Ecotalk | |
|---|---|---|---|---|---|
| Headline deal | Unlimited 5G for £3.75 in month one | 100GB of 5G at £4.98 a month | 30GB for £5 a month | 30GB for £5 or unlimited for £12.50 in month one | Unlimited for £11 in month one |
| How long the price lasts | Month one | First 3 months | First 3 months | First 30 days | Month one |
| Then | £15, then £14, then £13 from month 12 | £9.95 | Full plan price (30GB £10) | Standard price (unlimited £25) | £22 |
| Contract | None | 12 months, or 30-day plans from £5.95 | 30-day or 12-month plans | 30-day pay-as-you-go plans | 30-day rolling |
| Credit check | None | None | None | None | Not stated |
| Code or link | Code HONEST75 or link | Link | Link, code revealed on its page | Link | Link |
Frequently asked questions
What is the cheapest SIM only deal in the UK right now?
For the first month, Chattr: unlimited 5G data, calls and texts for £3.75 with code HONEST75, then £15, falling to £13 from month 12. For the first three months, Talkmobile's 100GB plan is £4.98 a month and Lebara's 30GB plan is £5 a month. All three are verified against each brand's own site.
What is the best SIM only deal for unlimited data?
Chattr's Freedom One is £3.75 in month one, Lyca Mobile's unlimited plan is £12.50 in month one against a standard £25, and Ecotalk's is £11 in month one, then £22. VOXI's £35 plan is unlimited too and pays a £20 gift card through our link. Which is cheapest over a year depends on how long the intro price lasts.
Do these SIM only deals need a credit check?
Chattr, Talkmobile, Lebara and Lyca Mobile state no credit check. Ecotalk does not state a credit check on its deals page. SIM-only plans do not include a phone, so there is no handset to finance.
Will the price go up after the intro period?
Yes, as shown in the table: Chattr moves to £15, Talkmobile to £9.95, Lebara to its full plan price, Lyca Mobile to its standard price and Ecotalk to £22. Plans on 30-day terms let you leave when the intro ends, so you can switch again.
Can I keep my number?
Yes, UK mobile numbers can be moved between providers with a PAC code from your old provider. Order the new SIM first, then ask your current provider for the code.
Do I need an unlocked phone?
Yes for Chattr, Lebara and 1pMobile, which say an unlocked phone is needed. Check before you order.
How does the VOXI reward work?
Join through the VOXI link on a plan of £10 a month or more, without a promo code at checkout, and pay for two months within 60 days. VOXI pays a £10, £15 or £20 gift card by plan: £10 on the £10 and £12 plans, £15 on the £15 plan and £20 on the £20 and £35 plans. You choose Amazon.co.uk, Just Eat or PayPal cash.
Compared, verified and link-tested — here's where to go next.
More mobile comparisons
Last checked 23 October 2026 by Bez, Editor-in-Chief. Figures verified against each brand's own terms. How we check.