Business SIM Only Deals UK 2026: Vodafone vs EE vs Three vs O2 Compared

⚡ Quick Answer — Business SIM Only Deals in 2026
The best business SIM only deals in mid-April 2026 start from £5/month (ex VAT) on a 24-month term with Three, rising to £6/month on a rolling contract. All four major UK networks — Vodafone, EE, Three and O2 — now include 5G, unlimited calls and texts, Wi-Fi Calling and eSIM support as standard on every business SIM-only plan.

Our pick for most businesses: Vodafone Business SIM Only 50 GB at £10/month — excellent coverage, strong roaming (83 destinations), dedicated account management and multi-line discounts from 5+ SIMs.
Cheapest deal available: Three Business SIM Only 5 GB at £5/month on 24 months — unbeatable if you need basic connectivity on a tight budget.

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Frequently Asked Questions

Which business SIM-only deal is cheapest in the UK in 2026?

Three currently offers the cheapest entry-level business SIM-only deal at £5/month for 5GB on a 24-month term. EE starts from £8/month for 5GB, O2 from £9/month, and Vodafone from £10/month. For unlimited data, Three remains the cheapest at around £19/month, with O2 and Vodafone unlimited tiers from £24–£28/month. Volume discounts typically reduce list pricing by 15–25% on five lines or more — published consumer prices are rarely the best you can negotiate for business.

Are business SIM-only deals cheaper than personal contracts?

Yes, in almost every case. A business SIM-only contract is typically 30–50% cheaper per line than the equivalent consumer PAYM plan once you factor in volume discounts, VAT-reclaimable invoicing and bundled features like spend caps, sharers, MDM hooks and named UK account managers. The catch is that providers usually require a registered business (sole trader is fine) and a credit check on the entity rather than the individual, so there is some onboarding paperwork.

What is the difference between SIM-only and SIM + handset contracts?

A SIM-only contract gives you the network connection (calls, texts, data) on a SIM you put in a phone you already own. A SIM + handset contract bundles the device cost into a single monthly bill, usually over 24 or 36 months. For businesses that already own handsets, SIM-only is dramatically cheaper. If you need new devices, a separate SIM-only plan plus an outright purchase or business lease is often cheaper than the bundled equivalent — and lets you refresh phones and SIMs on different cycles.

Can I keep my business mobile numbers when switching SIM-only providers?

Yes. You request a PAC code from each existing network (text PAC to 65075 from each line) and provide them to your new provider. Porting completes on a chosen working day, usually within 1–3 business days, and your numbers transfer with no loss of service when scheduled correctly. Fleets of 10+ lines are typically moved in scheduled batches over a single morning. We handle this end-to-end as part of any business SIM-only switch.

How much business mobile data do I need per user?

Average UK business users consume 12–25 GB per month if they primarily use Wi-Fi at the office, 30–60 GB for hybrid workers, and 60+ GB for fully mobile field teams. Sharer plans (where the data pool is split across all users) usually work out cheapest for fleets of 5+. Most business SIM-only plans now include unlimited data for £19–£28/month per line — for many fleets this is now cheaper than risk-managing tight allowances and paying overage.

Do business SIM-only deals include 5G access?

In 2026, all four UK MNOs include 5G access on their business SIM-only plans by default — there is rarely a separate 5G charge. Speeds vary by location, but all offer real 5G in major cities and increasing standalone-5G coverage. If a quoted business SIM-only price seems unusually low, double-check it includes 5G access and not just 4G LTE. Volume discounts on multi-line accounts are not affected by 5G inclusion.

Can a sole trader get a business SIM-only contract?

Yes. Most networks accept sole traders for business SIM-only contracts with proof of trading (e.g. UTR, business bank account, HMRC self-assessment). Limited companies and partnerships have a smoother credit assessment; new businesses (under 12 months) may need a director guarantee or smaller initial line allocation. Even single-line sole traders typically save 20–30% versus consumer pricing once they switch to a business SIM-only deal.

What happens at the end of a business SIM-only contract?

At the end of the minimum term your contract rolls onto a 30-day rolling basis at the same price unless you renegotiate. Networks rarely volunteer a discount at this point — most businesses overpay for years on out-of-term SIMs. We recommend setting a calendar reminder 60 days before the end-date to either renegotiate, switch supplier, or move to rolling. We can do a fleet audit free of charge to flag exactly which SIMs are out of term and overpaying.

Related Guides

• choosing the right mobile network for your business
• how much data your business actually needs
• managing mobile spend caps and budgets
• avoid roaming fees on business SIMs
• essential security features for business mobiles