Top Pick
#1
Free Vodafone SIM Card
Best 5G coverage in the UK
5.0
- Free SIM delivery
- 5G ready nationwide
- No contract required
- Pay-as-you-go bundles
Best Free SIM Cards & SIM Only Deals UK 2026
Ranked & rated by our editors — updated weekly.
Popular Choice
#2
Free O2 SIM Card
Loyalty perks with Priority rewards
4.9
- Free SIM, free delivery
- O2 Priority rewards
- Roaming in 75+ countries
- Flexible PAYG & monthly
#3
Free Three SIM Card
Massive data allowances
4.8
- Free SIM card delivery
- Unlimited data plans available
- Go Roam in 70+ destinations
- Strong 5G in cities
#4
Free Lebara SIM Card
Cheap international calling plans
4.6
- Free SIM, free delivery
- Low-cost international calls
- Runs on Vodafone's network
- Flexible 30-day plans
Member Favourite
#5
Free giffgaff SIM Card
No contracts, member-run network
4.5
- Free SIM with £5 bonus credit
- No contract goodybags
- Runs on O2's network
- Award-winning community support
#6
Free VOXI SIM Card
Endless social media data
4.4
- Free SIM, free delivery
- Endless social data on all plans
- Runs on Vodafone's 5G network
- No credit checks, no contract
#7
Free SMARTY SIM Card
Simple, honest plans on Three's network
4.3
- Free SIM, free delivery
- Cashback for unused data
- Runs on Three's 5G network
- No contract, no credit check
#8
Free Lyca Mobile SIM Card
Low-cost calls to 200+ countries
4.3
- Free SIM, free delivery
- Cheap international minutes
- Runs on EE's network
- Flexible 30-day plans
#9
iD Mobile SIM Only Deals
Cheap SIM-only plans on Three's network
4.2
- From £5/month SIM-only
- Data rollover & capping
- Runs on Three's 5G network
- 1-month rolling contracts
#10
Tesco Mobile SIM Only Deals
Clubcard Prices & a safety buffer
4.4
- Clubcard Prices on plans
- Safety Buffer caps overspend
- Runs on O2's network
- Free Anytime Upgrade
#11
BT Mobile SIM Only Deals
Volt perks for BT broadband customers
4.3
- BT Volt rewards (free data)
- Runs on EE's network
- Inclusive BT Wi-Fi hotspots
- 12 or 24-month SIM only
Fastest Network
#12
EE SIM Only Deals
UK's #1 rated network for speed
4.7
- From £12/month SIM-only
- Award-winning 5G speeds
- Smart Benefits with plans
- Free SIM included with any plan
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.
Travelling 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.