Best Business SIM Only Plans UK 2026 — All 5 Networks Compared
Independent comparison of every UK business SIM-only network. Real prices, real data allowances, side-by-side. Updated July 2026. Cheapest entry-level plan starts at £8/mo (O2); the cheapest unlimited 5G plan is £20/mo (O2).
At-a-glance winners by use case
EE Business
Highest UK 5G coverage and rural performance. Industry-leading speed test results from RootMetrics every year since 2017.
Plans from £13/mo · Unlimited from £25/mo
Compare EE Business SIM Only deals →Vodafone Business
Strongest roaming bundle (77+ destinations on Global Roaming Plus) and proper pooled-data plans. Best fit for international SMEs.
Plans from £17.50/mo · Unlimited from £31.67/mo
Compare Vodafone Business SIM Only deals →O2 Business
O2 Priority gives staff retail and ticket discounts, EU roaming included on every tier, and the most flexible 1-month rolling contracts.
Plans from £8/mo · Unlimited from £20/mo
Compare O2 Business SIM Only deals →Three Business
Cheapest per-GB on unlimited 5G plans. The 500GB plan at £20/mo is unbeaten on price-per-GB across all UK business networks.
Plans from £9/mo · Unlimited from £24/mo
Compare Three Business SIM Only deals →Sky Business Mobile
Runs on the O2 5G network with a Sky-managed billing layer. Aggressive new-customer pricing and strict price-lock guarantee.
Plans from £11/mo · No unlimited tier (yet)
Compare Sky Business SIM Only deals →Get a quote in 60 seconds
Tell us how many SIMs and your data needs — we'll send you the cheapest like-for-like quote across all 5 networks within 24 hours.
Side-by-side comparison: every UK business SIM-only network
All prices are excluding VAT, 24-month business terms, and based on each carrier's mid-tier and unlimited plans (May 2026). 5G access is included on every tier listed.
| Network | Cheapest plan | Mid-tier sweet-spot | Unlimited 5G | EU roaming | Best for |
|---|---|---|---|---|---|
| EE Business | 1GB · £13/mo | 50GB · £17/mo | £25/mo | Inclusive in EU | 5G coverage, rural areas |
| O2 Business | 2GB · £8/mo | 20GB · £14/mo | £20/mo | Inclusive in EU + Priority perks | Flexibility, staff perks, 1-mo rolling |
| Vodafone Business | 50GB · £17.50/mo | 120GB · £28.33/mo | £31.67/mo | Global Roaming Plus (77 dest.) | International, V-Hub support |
| Three Business | 3GB · £9/mo | 25GB · £11/mo | £24/mo · 500GB £20/mo | Go Roam (71 destinations) | Cheapest unlimited 5G, big data |
| Sky Business | 10GB · £11/mo | 20GB · £14/mo | Not offered | Roll & Share data pooling | Price-lock, data sharing across SIMs |
All plans listed include unlimited UK calls and texts and 5G access. Sky Business runs on the O2 5G network. Prices and allowances change frequently — request a like-for-like quote for the current sharpest deal.
What are the best EE SIM only business plans?
For most UK SMEs in 2026, EE Business SIM only plans split into three sweet spots: the £13/mo 1GB plan for light office users, the £17/mo 50GB plan for general business use, and the £25/mo Unlimited plan for field workers and heavy data consumers. Here's how every EE Business tier ranks.
Frequently asked questions
What is the best business mobile network in the UK?
For most UK SMEs in 2026, EE Business is the best overall network thanks to the highest 5G coverage and consistent speed test results. O2 wins for flexibility (1-month rolling contracts and Priority perks), Vodafone wins for international roaming, and Three wins for cheapest unlimited 5G data at £20-£24/mo.
What are the best EE SIM only business plans?
EE's three best business SIM only plans in 2026 are: 1GB at £13/mo for light users, 50GB at £17/mo as the sweet-spot for general SME use, and Unlimited 5G at £25/mo for field workers and heavy users. EE includes inclusive EU roaming, 5G access and unlimited UK calls and texts on every tier.
What are the best business SIM only deals in 2026?
The cheapest business SIM only deal in the UK in 2026 is O2's 2GB at £8/mo. The cheapest unlimited 5G deal is O2 Unlimited at £20/mo. The best value mid-tier is Three Business 25GB at £11/mo. The best value bulk-data plan is Three Business 500GB at £20/mo (4p per GB).
Is unlimited 5G worth it for business?
Unlimited 5G is worth it if your team consistently uses more than 100GB/month per SIM, tethers laptops or hotspots regularly, or watches video on the move. Below 100GB/month, the EE 100GB plan at £19/mo or the Three 80GB plan at £12/mo are usually better value than the unlimited tier.
Which UK business mobile network has the best 5G coverage?
EE has the highest 5G geographic and population coverage in the UK in 2026, followed by Vodafone and Three. RootMetrics has named EE the best UK mobile network in 14 of the last 16 reports. O2 has narrower 5G coverage but excellent indoor performance in cities.
What is the cheapest unlimited business SIM only plan?
The cheapest unlimited business SIM only plan in the UK in 2026 is O2 Business Unlimited at £20/mo, which includes 5G, EU roaming and O2 Priority perks. Three Business Unlimited at £24/mo runs a close second and is on a true uncapped 5G network with no speed-cap clauses.
