Lowest monthly price
O2
£20
+ VAT per month
Unlimited voice & data
24-month contract
Get an O2 business quoteAbout O2 for businessSIM Only Comparison
Compare Business SIM Only Deals
Price matters, but business SIM only deals should not be judged on monthly cost alone. Coverage, roaming, data limits, contract terms and support can matter more once the SIMs are in use.
Unlimited business SIM plans
Vodafone
£25
+ VAT per month
Unlimited voice & data
24-month contract
Enquire about VodafoneAbout Vodafone for businessEE
£25
+ VAT per month
Unlimited voice & data
24-month contract
Enquire about EEAbout EE for businessThree
£25
+ VAT per month
Unlimited voice & data
24-month contract
Enquire about ThreeAbout Three for businessPrices exclude VAT. Terms apply. Confirm any additional requirements before ordering.
Compare coverage at your UK address before choosingThe short answer
Don't choose a business SIM-only deal on monthly price alone. Check coverage at your sites first, then match the data allowance to real usage, confirm roaming inclusions and out-of-bundle rates, and weigh contract length against flexibility. The offers above are available to enquire about. Tell us about any additional requirements so we can confirm the right terms.
Before comparing prices, check coverage
A low-cost SIM deal can become expensive if staff cannot make calls or use data reliably. Check your business postcode before choosing a network.
Check Coverage FirstWhat to compare beyond monthly price
Monthly cost is important, but it is only one line in the total cost of running business mobiles. A deal that looks cheap can end up costing more through out-of-bundle charges, poor coverage, or inflexible contracts.
Before you compare headline prices, make sure you are comparing these factors side by side:
Indoor and outdoor coverage at your sites
Data allowance vs actual team usage
Roaming inclusions for European travel
Contract length and exit flexibility
Out-of-bundle rates for calls and data
Business support quality and response times
Compare by team size
Team size affects what kind of deal structure makes sense. Here are some practical patterns:
1–5 users
Straightforward SIM-only plans usually work. Focus on coverage at your main site and pick the best-fitting network. One provider is often enough.
6–25 users
Worth checking whether one network covers all locations well. If not, a mixed-network estate through a broker can deliver better results without much extra admin.
25+ users
Larger teams often benefit from a structured audit. Usage patterns, roaming profiles and site diversity usually mean a single plan type and one network is not the best fit for everyone.
Compare by usage type
Not every user needs the same plan. Matching plan type to actual usage avoids waste and out-of-bundle surprises.
| Usage profile | What to prioritise |
|---|---|
| Mostly calls, light data | Generous minutes, moderate data, strong indoor voice coverage |
| Heavy data (cloud, video) | High or unlimited data on a network with strong indoor data signal |
| Regular EU roaming | Inclusive roaming without punitive fair-use caps |
| Data SIMs for devices | Data-only tariff, right for routers/tablets — see our data SIM guide |
| Mixed use across team | Flexible plans per user, consider multiple plan tiers |
If some of your team need data-only SIMs for routers or tablets, see our business data SIM page or our comparison of SIM only vs data SIM.
Compare by travel and roaming needs
If your team travels to Europe regularly, roaming terms can make a significant difference to your monthly bill. Post-Brexit, not every network handles roaming the same way.
Some plans include EU roaming at no extra cost within fair-use limits. Others charge per day or cap usage. Check the detail before signing — a "free roaming" headline sometimes comes with strict daily limits.
For a deeper look at roaming terms, O2 business roaming is often a strong starting point for Europe-focused comparison.
Cheap plan traps to watch for
Low data cap with expensive overage
A cheap plan with 5GB that charges heavily per extra GB can cost more than a slightly pricier plan with 20GB you actually use.
No inclusive roaming
If your staff travel, a plan without roaming inclusions will generate expensive surprise charges within weeks.
Weak coverage at your locations
A bargain deal on a network with poor indoor signal at your office is a false economy. Your team will use workarounds that cost more in lost productivity.
Long contracts with no flex
A 36-month contract may lock you into a deal that no longer fits if your team or usage changes. Shorter terms or break clauses are worth the slight premium.
Single-network vs blended estates
Putting all your SIMs on one network keeps admin simple, but may leave some users with poor signal. A blended estate — different users on different networks — matches each person to the network that covers their actual workspace.
Working with a broker like Business Telco means you can still manage the whole estate through one point of contact, even if your SIMs are spread across EE, O2, Vodafone and Three. See our full guide on business SIM-only plans.
When SIM-only comparison is not what you need
If your priority is eSIM provisioning rather than SIM-only tariff comparison, our best business eSIM page is more relevant.
If you need data-only SIMs for routers and devices rather than voice-and-data plans for phones, start with the SIM only vs data SIM comparison.
Frequently asked questions
What should I compare beyond monthly price?
Coverage at your locations, data allowance fit for your actual usage, roaming inclusions, contract length, support quality and out-of-bundle charges. The cheapest deal is rarely the best deal when you factor in all of these.
Can I mix networks in a business SIM-only setup?
Yes. If different staff work in areas with different coverage strengths, putting everyone on the network that covers them best — rather than forcing one network — can improve reliability across the team.
Is SIM only better value than a phone-included contract?
Usually, yes — especially if your team already has working handsets. SIM-only plans avoid the cost of a handset subsidy, which is built into the monthly price of phone-included contracts. But compare like-for-like: check data, coverage and terms.
How do I know if my current SIM deal is poor value?
If you are paying for data you do not use, roaming you do not need, or sitting on out-of-contract rates, you are probably overpaying. A free audit can benchmark your current costs against what is available.
Let us compare deals for your business
A free audit benchmarks your current costs, checks coverage at every site and shortlists the SIM-only deals that genuinely fit your team.