SIM Only Deals UK
Rolling 30-Day Plans from £5/month
Compare the best SIM only deals with unlimited calls & texts, 5G at no extra cost and EU roaming included. No contract, no credit check — keep your number.
From £5/month
Cheapest rolling SIM only plans
No Contract
Cancel or change plan any month
5G & EU Roaming
Included at no extra cost
Why Choose a SIM Only Deal?
SIM only means you pay for the plan — not the phone. That's why it's the cheapest way to get connected.
Much Cheaper Than Phone Contracts
Because there's no handset to pay off, SIM only deals typically cost a fraction of a phone contract with the same data. Keep your current phone and pocket the difference.
No Contract, Ever
Giffgaff and Lebara plans roll on 30 days at a time. Change your data allowance every month, or cancel entirely with no early termination fees.
No Credit Check
Rolling monthly SIMs don't require a credit check, so approval is instant — the SIM simply arrives in the post in 3-5 days.
Keep Your Number
Text PAC to 65075 from your old network and give the code to your new one. Your number moves across in 1-2 working days.
5G at No Extra Cost
Both networks include 5G on every compatible plan — no premium 5G tariffs, no speed caps on standard plans.
EU Roaming Included
Use your UK data, minutes and texts across Europe on qualifying plans — ideal for holidays and business travel.
Best SIM Only Deals by Network
Giffgaff SIM Only (O2 Network)
Flexible "goodybags" you can change every month — the best all-rounder for most people.
- ✓ Goodybags from £6/month
- ✓ O2 network - 99% UK coverage
- ✓ Unlimited calls & texts on all plans
- ✓ Data options from 500MB to unlimited
- ✓ Free EU roaming on qualifying plans
- ✓ 5G included at no extra cost
- ✓ PAYG credit option as a fallback
Lebara SIM Only (Vodafone Network)
The cheapest entry point, with international minutes included — great for calls abroad.
- ✓ Plans from £5/month
- ✓ Vodafone network coverage
- ✓ International minutes to 40+ countries
- ✓ Unlimited UK calls & texts
- ✓ Free EU roaming included
- ✓ No credit checks required
- ✓ Rolling 30-day plans
SIM Only Deals Compared
We compare the two best no-contract networks side by side, so you can pick the right SIM only plan for how you use your phone.
| Feature | Giffgaff (O2 network) | Lebara (Vodafone network) |
|---|---|---|
| Plans from | £6/month | £5/month |
| Data options | 500MB to unlimited | 2GB to unlimited |
| Calls & texts | Unlimited UK on all goodybags | Unlimited UK on all plans |
| International calls | Pay-as-you-go rates | Included to 40+ countries |
| 5G | Included at no extra cost | Included at no extra cost |
| EU roaming | Included on qualifying plans | Included allowance |
| Contract | None — rolling 30 days | None — rolling 30 days |
| Credit check | None | None |
Best for most people: Giffgaff (O2 coverage, flexible goodybags). Best for international calling: Lebara (40+ countries included).
SIM Only Pricing by Usage
Typical monthly pricing across the networks we recommend. Pick the tier that matches your data use — upgrading or downgrading each month is free.
Light User
Messaging, email and maps
£5–£8/month
- ✓ 2–5GB data
- ✓ Unlimited calls & texts
- ✓ 4G as standard
- ✓ No contract
Standard User
Daily social media, music and streaming
£10–£15/month
- ✓ 10–20GB data
- ✓ Unlimited calls & texts
- ✓ 5G included
- ✓ EU roaming
Heavy User
Hotspotting, video and replacing broadband
£20–£35/month
- ✓ Unlimited data
- ✓ Unlimited calls & texts
- ✓ 5G included
- ✓ EU roaming
Prices are indicative and may change — always confirm current pricing on the network's site before ordering.
SIM Only Deals: FAQs
What is the cheapest SIM only deal in the UK?
Lebara SIM only plans start from around £5/month and Giffgaff goodybags from around £6/month, both with unlimited UK calls and texts included. These are rolling 30-day deals, so you can cancel or change plan any month.
What does SIM only mean?
SIM only means you buy just the SIM card with a plan of data, minutes and texts — no phone is included. Because you're not paying off a handset, SIM only deals are typically much cheaper than phone contracts.
Do SIM only deals require a credit check?
Rolling 30-day SIM only deals from Giffgaff and Lebara do not require a credit check. Traditional 12-24 month SIM only contracts from the major networks usually do.
How much data do I need on a SIM only plan?
As a guide: 5GB covers light use (messaging, email, maps); 10-20GB covers daily social media and music streaming; unlimited suits heavy users, hotspotting and anyone replacing home broadband.
Can I keep my number with a SIM only deal?
Yes. Text PAC to 65075 from your current network to get a switching code, then give it to your new network. Your number transfers in 1-2 working days.
Explore SIM Only Deals in Depth
Guides and comparisons for every type of SIM only plan.
Unlimited Data SIMs
Truly unlimited plans from ~£25/month for streamers, hotspotting and broadband replacement.
Data Only SIMs
SIMs for iPads, tablets, routers and mobile WiFi — from ~£5/month.
Giffgaff vs Lebara
Head-to-head comparison of the two best no-contract networks.
5G SIM Only Deals
5G plans and coverage compared on O2 and Vodafone networks.
Cheap SIM Only Deals Guide
How to find a genuinely cheap deal and how much data you need.
How to Switch & Keep Your Number
The PAC code process, step by step — switch in 1-2 working days.
Ready to Switch to a Better SIM Only Deal?
Order a free SIM today, keep your number, and start saving from your first month