Updated May 2026
Order a Free SIM Card in the UK
No Cost. No Commitment.
Compare free SIM cards and the best SIM only deals from every major UK network — Vodafone, O2, Three, EE, giffgaff and more.
12 trusted UK networks compared
Best Free SIM Cards & SIM Only Deals UK 2026
Ranked & rated by our editors — updated weekly.
#1
Free Vodafone SIM Card
Best 5G coverage in the UK
5 / 5Free SIM delivery
5G ready nationwide
No contract required
Pay-as-you-go bundles
We may earn a commission when you order through our links — you still pay £0 for free SIMs.
Free SIM vs SIM only — which is right for you?
Both get you on a UK network — the difference is commitment, cost, and how much data you actually need.
| Free SIM card | SIM only deal | |
|---|---|---|
| Cost | £0 — pay only when you top up | Set monthly fee (from £5/mo) |
| Contract | None — pay-as-you-go | 1, 12 or 24 months |
| Data | What you top up for | Fixed allowance (5GB to unlimited) |
| Credit check | Not required | Soft check on 12+ month plans |
| Best for | Backup line, light use, no commitment | Regular smartphone users who want value |
How we compare free UK SIM cards
Independent, regularly refreshed and based on the things that actually matter when you order a SIM.
Coverage
We cross-check Ofcom’s UK 4G/5G data with each network’s own coverage maps.
Plans & value
We re-price every network’s PAYG and 30-day bundles each month.
Real user feedback
Trustpilot, Reddit and our own readers feed into the ratings.
Why are these SIM cards free?
UK mobile networks send free SIMs to attract new customers. There’s no obligation to top up or take a contract — you simply receive the SIM in the post and activate it whenever you’re ready. It’s a risk-free way to try a new network, get a backup line, or keep your old number alive.
100% Free
No charges for the SIM or delivery.
No Contract
Use it once, top up later, or never.
Keep Your Number
Free PAC code transfers your old number.
What you’ll need to order a free SIM
A UK delivery address
Free Royal Mail delivery — no PO boxes.
An unlocked phone
Most modern handsets are unlocked. If yours isn’t, ask your old network for a free unlock.
About 2 minutes
That’s all it takes to fill in your details and order. The SIM does the rest.
Traveling Soon?
Get a free roaming eSIM — save up to £200 per trip
Skip £6/MB roaming charges from EE, Vodafone, Three & O2. Compare the best free travel eSIMs.
Frequently Asked Questions
Yes — UK networks send free SIM cards with no charge for the SIM or delivery. You only pay if and when you choose to top up or pick a bundle.
No. All the SIMs we list are pay-as-you-go or 30-day rolling, so there’s no long-term commitment. You can cancel or switch at any time.
Most UK networks deliver a free SIM within 1–3 working days. Some offer next-day delivery if you order before the cut-off.
Yes. Request a free PAC code from your current provider and give it to your new network — your number transfers within one working day.
Free SIMs are usually ‘triple SIMs’ that fit standard, micro and nano slots, so they work in virtually all unlocked phones.
A free SIM is a standalone SIM card sent to you with no commitment — you only pay if you choose to top up or pick a bundle. A SIM only deal is a paid monthly contract (1, 12 or 24 months) with a set data, minutes and texts allowance, usually at a lower per-GB cost.
Yes — typically much cheaper. SIM-only plans only cover the airtime, so you avoid paying for the handset over 24 months. If you already own a phone, SIM only is almost always the better-value choice.
Most 12 and 24-month SIM only contracts run a soft credit check. If you want to skip the credit check entirely, choose a 1-month rolling plan from networks like giffgaff, Smarty or Lebara — or stick with a free pay-as-you-go SIM.