Cheap Business SIM Only Deals UK 2026 | Compare & Save
Compare The Networks is an OFCOM regulated, independent comparison service that has helped UK businesses cut their telecoms costs since 2008. We compare cheap business SIM only deals from EE, Vodafone, O2 and Three so you can see the lowest genuine price for the data your team actually uses.
We are rated 4.3 out of 5 on Trustpilot from over 1,000 reviews, and the comparison is completely free. The networks pay us, not you, so there is no cost and no obligation.
Get a free quote tailored to your business, or read on to find out how to get the cheapest business SIM only deal.
About Cheap Business SIM Only Deals
A cheap business SIM only deal gives you data, minutes and texts on a SIM card without paying for a handset. Because there is no phone cost baked into the monthly price, SIM only is almost always the cheapest way to run business mobiles, especially when your team already owns their phones.
The trick to a genuinely cheap deal is matching the plan to real usage rather than chasing the biggest headline allowance. We compare EE, Vodafone, O2 and Three side by side so you can see where the same coverage and features cost noticeably less. For VAT-registered businesses the quoted prices are before VAT, which you can reclaim, lowering the effective cost further.
How It Works
- Tell us what your business needs (number of lines, rough monthly data per user, and the postcodes you work from)
- We compare cheap SIM only deals across all four major UK networks and shortlist the lowest genuine cost for that coverage
- You pick the deal that saves the most, with no obligation to proceed
Starting takes under 60 seconds and costs nothing. We are OFCOM regulated and have compared business telecoms for UK companies since 2008.
Why Compare?
Most businesses overpay on mobile by 20 to 35 percent, usually because a contract auto-renewed at an inflated rate, the data allowance is far bigger than anyone uses, or a cheaper network covers the same postcodes just as well. The cheapest advertised price is only cheap if the signal, allowance and terms actually fit your business, so comparing all four networks together is the fastest way to find real savings.
| What We Check | Why It Matters For Cost |
|---|---|
| Coverage at your postcodes | A cheap deal is worthless if staff drop calls or fall back to slow data |
| Data vs actual usage | Right-sizing the allowance cuts the bill and avoids costly overage charges |
| Price per line | The lowest per-line rate is where multi-user businesses save the most |
| Multi-line discounts | Pooling 5+ SIMs typically saves 10 to 25 percent versus separate plans |
| Contract terms | Price rises and exit fees can wipe out a low headline monthly cost |
Frequently Asked Questions
Can I keep my existing number when I switch to a cheap business SIM only deal?
Yes. Request a PAC code from your current provider (text PAC to 65075), give it to your new network, and your number transfers to the new SIM. The switch usually completes within one working day and there is no break in service, so moving to a cheaper deal does not mean losing the number your customers already have.
How do I get the cheapest business SIM only deal?
Match the plan to real usage rather than the biggest allowance, compare all four networks for the same coverage, and pool lines onto one business account to unlock multi-line discounts. Checking your actual average data use per user first is the single biggest saving, because most businesses pay for far more data than they use. Our free comparison does this for you across EE, Vodafone, O2 and Three.
What contract length gives the cheapest business SIM only price?
Business SIM only deals run on a minimum 24-month term, and that longer commitment is exactly what unlocks the lowest per-line prices from EE, Vodafone, O2 and Three. Because there is no handset cost to recover, the monthly SIM only rate over 24 months is typically well below what you would pay on a shorter mobile contract with a phone included.
Do cheap business SIM only deals include 5G?
Yes, in most cases. EE, Vodafone, Three and O2 now include 5G on the majority of their business SIM only plans at no extra cost, as long as you have a 5G-capable handset and are in a 5G area. You do not need to buy a premium plan to get 5G, so a cheap SIM only deal can still deliver full speeds where coverage exists.
How little data do I need to keep costs down?
For email, messaging and light browsing, 5 to 10 GB per user per month is usually plenty and keeps the price at its lowest. Add headroom to around 25 GB if staff make regular video calls or use cloud apps on the move. Only heavy users who tether a laptop really need unlimited data, so buying it for everyone is a common and avoidable overspend.
Can VAT-registered businesses reclaim the VAT on a cheap SIM only deal?
Yes. Business SIM only prices are quoted before VAT, and a VAT-registered business can reclaim the VAT on the portion used for business, lowering the true cost even further. Keep the network's VAT invoices for your records. If a phone is used partly for personal calls, you reclaim only the business-use proportion, so it is worth agreeing a sensible split with your accountant.