BT Mobile SIM Only Deals
Volt perks for BT broadband customers
Updated April 2026 · 3 min read · Reviewed by The Free SIM Cards UK editorial team · Why trust us
What is the BT Mobile SIM only deal?
BT Mobile doesn't ship free standalone SIMs but offers strong SIM-only contracts on EE's network. The real magic is BT Volt — bundle with BT broadband and your data doubles.
It runs on EE (BT Group, MVNO), giving you 99%+ UK population (via EE) on 4G and Largest & fastest UK 5G network on 5G. Piggybacks EE — UK's fastest network with excellent rural reach.
Plans start at SIM-only from £10/mo (double data with BT Volt). and the SIM itself is free with any plan — delivery is Free SIM with any plan order. Best for existing bt broadband customers who want bundled rewards. Not sold? Compare it with our Vodafone review or O2 review.
What we like about BT Mobile
- Volt doubles your data if you have BT broadband
- Uses EE's award-winning network
- Free access to BT Wi-Fi hotspots
Where BT Mobile falls short
- No free standalone SIM card
- Best value only with BT broadband
At a glance
Network host
EE (BT Group, MVNO)
Delivery
Free SIM with any plan order
SIM types
Triple-cut SIM + eSIM
Contract
12 or 24-month SIM-only
Credit check
Required
EU roaming
Inclusive Roam Like Home in EU
On this page⌄
Why BT Mobile doesn't offer a free SIM card
Unlike networks like giffgaff or Smarty, BT 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, BT Mobile's SIM-only deals start from £10/month and the SIM itself is free with any plan.
BT Mobile coverage
Piggybacks EE — UK's fastest network with excellent rural reach.
4G
99%+ UK population (via EE)
5G
Largest & fastest UK 5G network
Host
EE (BT Group, MVNO)
Keep your existing number
Switching to BT 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 BT Mobile during activation and your number transfers within one working day.
Our BT Mobile rating breakdown
How we tested: We compared BT Mobile against the other UK networks on public coverage data, plan pricing, customer reviews and our own delivery test.
Who BT Mobile is best for
Existing BT broadband customers who want bundled rewards.
Network coverage
Piggybacks EE — UK's fastest network with excellent rural reach.
BT Mobile vs other free UK SIM cards
How BT Mobile stacks up against the next 3 best-rated free SIM cards we reviewed.
| Network | Rating | Delivery | Contract | Credit check | EU roaming |
|---|---|---|---|---|---|
| BT Mobile (this review) | 4.3 / 5 | Free SIM with any plan order | 12 or 24-month SIM-only | Required | Inclusive Roam Like Home in EU |
| 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) |
BT Mobile free SIM FAQ
The verdict on the BT Mobile SIM only deal in 2026
If you already pay BT for broadband, BT Mobile's Volt bundle effectively doubles your mobile data for nothing. Without broadband, the deals are decent but not market-leading.
Free SIM with any plan · 30-day rolling · Cancel anytime
Related guides
Ready to see BT Mobile's SIM only deals?
Plans from £10/mo. Free SIM included with every plan.
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