Free SMARTY SIM Card
Simple, honest plans on Three's network
Updated April 2026 · 3 min read · Reviewed by The Free SIM Cards UK editorial team · Why trust us
What is the free SMARTY SIM?
SMARTY sends a free SIM with no commitment. Plans are simple, monthly, and you get cashback for any data you don't use.
It runs on Three (MVNO), giving you 99% UK population (via Three) on 4G and Largest 5G geographic footprint on 5G. Runs on Three — 99% UK 4G coverage and one of the largest 5G networks.
The SIM card and UK delivery are completely free (2–3 working days). There's no contract, no credit check, and you only pay if you choose to top up. Best for light-to-medium users who want fair, flexible pricing. Not sold? Compare it with our Vodafone review or O2 review.
What we like about SMARTY
- Get money back for data you don't use
- Unlimited plans available
- Transparent, no-nonsense pricing
Where SMARTY falls short
- Coverage tied to Three's network
- App-only customer support
At a glance
Network host
Three (MVNO)
Delivery
2–3 working days
SIM types
Triple-cut SIM + eSIM
Contract
None — 30-day rolling
Credit check
Not required
EU roaming
Included (12GB fair-use)
On this page⌄
How to order your free SMARTY SIM
- 1
Click 'Order Free SIM'
You'll be taken straight to SMARTY's order page.
- 2
Enter your UK address
No payment, no card details — just where to send the SIM.
- 3
SIM arrives in the post
Typically 2–3 working days via Royal Mail.
- 4
Pop it in & activate
Follow the leaflet to activate online or by short call.
Free SIM · Free UK delivery · No contract
SMARTY coverage
Runs on Three — 99% UK 4G coverage and one of the largest 5G networks.
4G
99% UK population (via Three)
5G
Largest 5G geographic footprint
Host
Three (MVNO)
Keep your existing number
Switching to SMARTY doesn't mean losing your number. Text the word PAC to 65075 from your current SIM. You'll get a free PAC code within 60 seconds — it stays valid for 30 days. Hand it to SMARTY during activation and your number transfers within one working day.
Our SMARTY rating breakdown
How we tested: We compared SMARTY against the other UK networks on public coverage data, plan pricing, customer reviews and our own delivery test.
Who SMARTY is best for
Light-to-medium users who want fair, flexible pricing.
Network coverage
Runs on Three — 99% UK 4G coverage and one of the largest 5G networks.
SMARTY vs other free UK SIM cards
How SMARTY stacks up against the next 3 best-rated free SIM cards we reviewed.
| Network | Rating | Delivery | Contract | Credit check | EU roaming |
|---|---|---|---|---|---|
| SMARTY (this review) | 4.3 / 5 | 2–3 working days | None — 30-day rolling | Not required | Included (12GB fair-use) |
| Vodafone | 5.0 / 5 | 1–3 working days | None — PAYG or 30-day plans | Not required | Inclusive in most plans (fair-use cap) |
| O2 | 4.9 / 5 | 2–3 working days | None — PAYG or 30-day Big Bundles | Not required | Included in Europe (25GB fair-use) |
| Three | 4.8 / 5 | 1–3 working days | None — PAYG or 1/12/24-month options | Not required | Go Roam in 70+ destinations (12GB fair-use) |
SMARTY free SIM FAQ
The verdict on the SMARTY free SIM in 2026
SMARTY's automatic cashback on unused data makes it perhaps the fairest network in the UK. Simple, honest, and great value if Three covers your area.
Free SIM · Free UK delivery · No contract
Related guides
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