Business SIM Only Deals Explained: How to Get the Right Plan (2026)

SIM-only is my default recommendation for most business mobile estates, and I say that as the person who signs off our own bills. You pay for airtime - calls, texts, data - and nothing else: no handset finance buried in the monthly fee, no paying interest on a phone you could have bought outright. But "business SIM only" covers a wide range of plans, prices and terms, and the difference between a well-chosen deal and a lazy one compounds across every line, every month, for the length of the contract. This guide explains what business SIM-only actually includes, what it typically costs in 2026, and how to pick the right plan for your team.

What "business SIM only" actually means

A SIM-only deal is exactly what it sounds like: the provider supplies the SIM (or eSIM) and the airtime, and the handset is your problem - whether that is devices you already own, handsets bought outright, or a separate leasing arrangement. The "business" part is not just a label. A proper business SIM-only plan differs from a consumer one in several ways that matter once you are running more than one or two lines:

• Business billing. One consolidated invoice in the company name, VAT itemised so reclaiming it is painless, with per-line breakdowns for your accounts.
• Pooled or shared data. The option to combine allowances into one bucket across the team - the single biggest difference in practice, covered in our data pooling guide.
• Account management. A contact who can add lines, apply bars and sort problems without each employee phoning a consumer call centre.
• Management and security. Support for MDM enrolment, usage alerts and spend caps at the account level.
• Priority and support terms. Business tariffs on the main networks generally come with business-grade support commitments that consumer SIMs do not.

A consumer SIM in a company phone works, but the business is then invisible to the network: no pooling, no central control, and an employee's personal credit agreement tangled up with company kit. Our article on business vs personal mobile covers why that separation matters.

What's typically included in 2026

Most business SIM-only plans on EE, Vodafone and O2 now follow a similar shape:

• Unlimited UK calls and texts as standard on virtually all business tariffs - per-minute pricing has all but disappeared from this market.
• A data tier - the real variable. Typical rungs are around 5GB, 25GB, 100GB and unlimited, with pooled options alongside.
• 5G access included rather than charged as an extra on current plans.
• EU roaming - varies by network and tier. Some plans include EU roaming allowances; others charge a daily fee. Worth checking line by line if your team travels.
• Wi-Fi calling and eSIM support as standard - useful for thick-walled offices and for trialling a network before committing.
• Spend caps and usage alerts - configurable, and worth switching on from day one.

What does business SIM-only cost?

Treat everything in this section as illustrative, as of June 2026. Business mobile pricing moves constantly, varies by network, line count and negotiation, and the published rate card is rarely the final price - which is exactly why we compare live deals across the networks rather than working from a static table. With that said, as a guide:

Three honest caveats on those numbers. First, multi-line discounts are real: the per-line rate for 20 connections is usually meaningfully lower than for two. Second, the cheapest headline price is often a 36-month term - check what you are trading for it (our contracts guide covers term lengths and the traps). Third, prices are quoted ex VAT in business contexts; if you are comparing against a consumer deal, remember consumer prices include VAT. For the full picture - including handset bundles and worked example bills - see how much business mobile costs in 2026.

When SIM-only beats a handset bundle

The financial logic is simple: a bundled contract is a phone loan plus airtime, and the loan is rarely cheap. With SIM-only you separate the two decisions - airtime from whoever offers the best plan, hardware bought (or financed) on its own merits. SIM-only tends to win when:

• Your handsets are fine. Modern phones comfortably last three to five years with a battery replacement. Re-signing on SIM-only and keeping devices an extra year is one of the cleanest savings in telecoms.
• You can fund devices separately. Bought outright, a handset costs what it costs - no mark-up spread over 36 months.
• Your team is BYOD. If staff use their own phones under a proper BYOD policy, the company only needs to provide airtime.
• You value flexibility. SIM-only terms are typically shorter (30 days to 24 months), so you can renegotiate or re-shape the estate as headcount changes.

The bundle still earns its place when you need to equip a team with new devices and would rather spread the cost than write one large cheque - the cash-flow argument is legitimate, just go in knowing you are paying for the convenience. The full decision logic is in our SIM-only vs handset contracts comparison.

Contract lengths: shorter is not always better

Business SIM-only terms typically come in 30-day rolling, 12-month, 24-month and sometimes 36-month flavours. The trade-off is the obvious one - commitment buys a lower rate:

My CFO instinct: 24 months is the right default for a stable team, with a diary entry three months before renewal so the contract never rolls over unexamined. Whatever the term, get any in-contract price rises stated in pounds and pence in writing - Ofcom requires this on new contracts, and a provider hedging on the question is a warning sign.

Getting the data tier right

The most common SIM-only mistake is not the network or the term - it is buying the wrong amount of data, in the wrong shape. Two rules of thumb:

1. Buy on evidence, not guesswork. Pull three months of actual usage from your current bills before choosing tiers. Most businesses find a wide spread: a few heavy users, a long tail barely touching 2GB.
2. Pool from about five lines upward. Instead of ten individually-guessed allowances, one shared bucket sized on total historic usage plus a buffer. Light users subsidise heavy ones automatically and overage largely disappears - the mechanics are in our pooling guide.

Unlimited-everything across the whole estate is the lazy alternative, and sometimes the quotes are close enough that it is genuinely the right call - but check the maths rather than assuming.

How to get a good deal: a short checklist

• Audit current usage (data per line, roaming, out-of-bundle charges) before asking for quotes.
• Get like-for-like quotes across at least two networks - or use a provider who compares them for you.
• Ask for pooled pricing alongside per-line pricing from five lines up.
• Confirm year-two and year-three pricing in pounds and pence, in writing.
• Check roaming terms per plan if anyone travels - daily charges across a team add up fast.
• Switch on spend caps and usage alerts from day one.
• Diarise the renewal window before you sign.

The bottom line

Business SIM-only is the cleanest way to buy mobile airtime: you pay for what your team actually uses, on terms short enough to keep providers honest, with the handset decision made separately on its own merits. Get the data tier right - pooled where the team is big enough - and it is usually the cheapest way to run a business mobile estate, full stop. If you want the comparison done properly, get a business SIM-only quote and we will price your team across EE, Vodafone and O2 - pooled and per-line, with the year-two costs in writing.