A Guide to Business SIM Only Deals

If your business already owns its phones, or your team members are happy using their own, there’s a good chance you’re paying more than you need to for your mobile contracts. Business mobile plans that bundle a handset into the monthly price are convenient, but you pay a premium for that convenience, and often long after the handset has been paid off.

That’s where SIM only comes in. In this guide, we’ll explain what business SIM only deals are, how they work, what they typically cost, and what to look out for when comparing plans.

What Is a Business SIM Only Deal?

A business SIM only deal gives you exactly what the name suggests: a SIM card and an allowance of data, calls and texts, with no handset included. You put the SIM into a phone your business already owns, a handset you’ve bought outright, or an employee’s own device if you operate a bring your own device policy.

Because there’s no handset to pay off, the monthly price only covers the airtime. That’s why SIM only plans are consistently the cheapest way to keep a business connected, and why they’ve become the default choice for small businesses that don’t need to refresh their phones every couple of years.

How Do Business SIM Only Deals Work?

Business SIM only plans work in much the same way as consumer SIM only plans, with a few important differences.

First, they’re sold business to business, so prices are usually quoted excluding VAT. If your business is VAT registered, you can usually reclaim the VAT on the cost, something you can’t normally do with a personal contract.

Second, they’re built for teams rather than individuals. Most providers let you manage all of your SIMs under a single account with one bill, add or remove connections as your headcount changes, and view usage across the whole business. Some plans pool data across every SIM, which we cover in more detail in our guide to shared and pooled data plans.

Third, volume matters. The more connections you have, the better the per SIM price tends to be, so it’s worth quoting for the whole team rather than adding lines one at a time.

The Benefits of SIM Only for Business

Lower Monthly Costs

Stripping the handset out of the contract typically cuts the monthly cost dramatically, and businesses switching from handset bundles to SIM only deals can often save 40% or more per connection. Across a team of ten or twenty people, that adds up quickly.

Shorter, More Flexible Contracts

Handset contracts usually tie you in for 24 or even 36 months. SIM only contracts are available on 30 day rolling, 12 month and 24 month terms, so you can choose how much flexibility you want. Shorter terms make it easier to renegotiate, scale down, or switch providers if your circumstances change.

Keep the Phones You Already Have

Modern smartphones comfortably last four or five years. If your team’s handsets are still working well, there’s no reason to replace them just because a contract is up for renewal. SIM only lets you keep using them and pay only for the service you actually need.

Simpler Budgeting

With no handset costs buried in the price, it’s much easier to see exactly what your mobile service costs and to compare deals like for like. Fewer moving parts also means fewer billing surprises, especially if you set spend caps on each SIM.

What to Look for When Comparing Business SIM Only Deals

Data Allowance

Think about how your team actually uses data. Staff who mostly use email, maps and messaging will rarely exceed a few gigabytes a month, while field teams running video calls or uploading photos and files will need much more. Many providers offer unlimited data plans, but check the small print first; our guide to fair usage policies explains what unlimited really means.

Contract Length

Weigh the lower prices of longer terms against the flexibility of rolling contracts. If your headcount is stable, a 12 or 24 month term usually offers the best value. If your business is growing or seasonal, the freedom of a 30 day plan may be worth a slightly higher monthly price.

Network Coverage

The cheapest deal is poor value if your team can’t get a signal. Check predicted coverage at your premises and in the areas where your staff spend their time using Ofcom’s mobile coverage checker, and read our guide on how to check mobile coverage for your business for more detail.

5G Access

Most business SIM only plans now include 5G at no extra cost, but it’s still worth confirming, particularly if your team relies on fast mobile data for large files or video.

Roaming

If anyone in your business travels, check what each plan charges for using your phone abroad. Since Brexit, most networks charge daily fees for roaming in Europe, and the differences between providers can be significant. Our guide to business mobile roaming charges covers this in full.

Spend Caps and Alerts

By law, providers must offer you the option of a bill limit when you take out a contract, which caps out of bundle spending such as premium calls or extra data. Setting sensible caps on every SIM is one of the easiest ways to avoid bill shock.

Price Rises

Since January 2025, providers have not been allowed to include inflation linked price rises in new contracts; any mid-contract increase must be set out in pounds and pence before you sign. Check what, if anything, your monthly price will rise by during the term.

Is SIM Only Right for Your Business?

For most small businesses, SIM only is the most cost effective option, but it’s not automatically the right one. If your team genuinely needs new handsets and you’d rather spread the cost than buy them outright, a handset contract or a leasing arrangement may still make sense. We compare the two approaches in our guide to SIM only vs handset contracts.

As a rule of thumb, SIM only is the better choice if your phones are less than four or five years old and still supported with software updates, if you operate a bring your own device policy, or if keeping monthly costs down matters more than having the latest hardware.

Whichever way you lean, the worst option is doing nothing. Out of contract prices are rarely competitive, and a few minutes spent comparing business SIM only deals can deliver savings that repeat every single month.