iD Mobile SIM Only Deals
Cheap SIM-only 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 iD Mobile SIM only deal?
iD Mobile doesn't ship a free standalone SIM, but it does some of the cheapest SIM-only contracts in the UK on Three's network — with free data rollover and a built-in cap.
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.
Plans start at SIM-only from £5/mo on Three's network. and the SIM itself is free with any plan — delivery is Free SIM with any plan order. Best for bargain hunters who want a cheap monthly plan with no surprises. Not sold? Compare it with our Vodafone review or O2 review.
What we like about iD Mobile
- Among the cheapest UK SIM-only deals
- Free data rollover keeps unused GB
- Hard cap stops bill shock
Where iD Mobile falls short
- Doesn't offer a free SIM card
- Customer service via app/chat only
At a glance
Network host
Three (MVNO)
Delivery
Free SIM with any plan order
SIM types
Triple-cut SIM + eSIM
Contract
1, 12 or 24-month SIM-only
Credit check
Required
EU roaming
Included on most plans (fair-use cap)
On this page⌄
Why iD Mobile doesn't offer a free SIM card
Unlike networks like giffgaff or Smarty, iD Mobile doesn't post out standalone free SIM cards. Their business model is built around paid SIM-only contracts — you get a free SIM included whenever you sign up to a plan, but there's no way to order just a SIM with no commitment.
If you specifically want a totally-free SIM with no plan, look at our free SIM comparison. Otherwise, iD Mobile's SIM-only deals start from £5/month and the SIM itself is free with any plan.
iD Mobile 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 iD Mobile 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 iD Mobile during activation and your number transfers within one working day.
Our iD Mobile rating breakdown
How we tested: We compared iD Mobile against the other UK networks on public coverage data, plan pricing, customer reviews and our own delivery test.
Who iD Mobile is best for
Bargain hunters who want a cheap monthly plan with no surprises.
Network coverage
Runs on Three — 99% UK 4G coverage and one of the largest 5G networks.
iD Mobile vs other free UK SIM cards
How iD Mobile stacks up against the next 3 best-rated free SIM cards we reviewed.
| Network | Rating | Delivery | Contract | Credit check | EU roaming |
|---|---|---|---|---|---|
| iD Mobile (this review) | 4.2 / 5 | Free SIM with any plan order | 1, 12 or 24-month SIM-only | Required | Included on most plans (fair-use cap) |
| 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) |
iD Mobile free SIM FAQ
The verdict on the iD Mobile SIM only deal in 2026
iD Mobile won't send you a free standalone SIM, but if you want the cheapest paid SIM-only plan on Three's network with free rollover, they're hard to beat.
Free SIM with any plan · 30-day rolling · Cancel anytime
Related guides
Ready to see iD Mobile's SIM only deals?
Plans from £5/mo. Free SIM included with every plan.
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