Cheapest Business SIM Only Deals UK 2026: From £5/mo After VAT

Updated April 2026. All prices shown after VAT (ex-VAT pricing is standard in B2B, but we’ve included after-VAT figures for sole traders and small businesses who cannot reclaim VAT). Contract lengths are 24 months unless stated otherwise.

What Are the Cheapest Business SIM Only Deals in the UK in 2026?

Business SIM only deals strip away the handset cost, making them the most cost-effective way to keep your team connected. Unlike consumer plans, business SIM only deals come with dedicated account management, priority support, and the ability to manage multiple lines from a single portal.

Below, we’ve compared every major UK network’s business SIM only pricing across four data tiers — from light-use 1GB plans to fully unlimited data — so you can find the cheapest deal for your exact usage requirements.

How Much Do Business SIM Only Deals Cost Per Network?

*Connection Technologies partner pricing is available on Vodafone, EE, O2 and Three networks. Rates shown are typical for 5+ SIM orders on 24-month contracts. Individual pricing depends on volume and commitment — request a tailored quote for exact figures.

Our pick for overall cheapest: Three Business at £5/mo for 1GB. Our pick for best value: Vodafone Business at £12/mo for 20GB, which includes EU roaming at no extra cost.

Which Network Offers the Best Business SIM Only Deal? Pros and Cons

Three Business — Cheapest Starting Price

Three consistently offers the lowest headline pricing for business SIM only deals. Their 5G rollout has accelerated considerably in 2025–2026, making them a genuine contender for businesses in urban areas.

• ✓ Cheapest 1GB plan at just £5/mo after VAT
• ✓ 5G included at no extra cost on all plans
• ✓ No mid-contract price rises on fixed-term deals
• ✓ Go Roam in 71 destinations included
• ✗ Weakest indoor coverage in rural areas
• ✗ Business support can be slow during peak periods
• ✗ Limited shared data pool options for teams

Best for: Sole traders and micro-businesses who primarily work in towns and cities and want the absolute cheapest monthly cost.

Vodafone Business — Best Overall Value

Vodafone’s business SIM only plans strike the best balance between price, coverage, and features. Their 20GB plan at £12/mo is particularly competitive, and the included roaming across 83 countries is a standout benefit for businesses with international travel.

• ✓ Excellent 5G and 4G coverage across the UK
• ✓ EU and international roaming included in 83 destinations
• ✓ Strong business portal for multi-line management
• ✓ Dedicated UK-based business support team
• ✓ Data sharing across team SIMs available
• ✗ Slightly more expensive than Three for basic plans
• ✗ Mid-contract CPI price increases apply to some tariffs

Best for: SMEs with 5–50 employees who need reliable coverage, international roaming, and centralised account management. Our top recommendation for most businesses.

EE Business — Best Network Speed and Coverage

EE remains the UK’s fastest and most extensive 5G network, making their business SIM only deals the go-to choice for data-hungry teams or those in areas where other networks struggle.

• ✓ UK’s largest 5G footprint and fastest average speeds
• ✓ Best rural and indoor coverage of any network
• ✓ Priority support with dedicated business account managers
• ✓ Microsoft 365 integrations on premium plans
• ✗ Most expensive network across all data tiers
• ✗ EU roaming charges apply on entry-level plans
• ✗ 24-month minimum contracts standard

Best for: Businesses in rural locations, field-based teams, and companies that rely on mobile data for critical applications like video calls and cloud software.

O2 Business — Best for Flexible Data Sharing

O2’s Sharer tariffs allow businesses to buy a single data pool and distribute it across multiple SIMs, which can deliver significant savings if your team’s usage varies month to month.

• ✓ Flexible shared data pools reduce wastage
• ✓ Good 4G coverage, expanding 5G rollout
• ✓ O2 Priority perks included for all business lines
• ✓ 30-day rolling contracts available on select plans
• ✗ 5G coverage still lags behind EE and Vodafone
• ✗ Shared data management requires admin oversight
• ✗ Premium plans needed for international roaming

Best for: Businesses with variable data usage across a team, where some employees use very little data and others need significantly more.

BT Business Mobile — Best for BT Broadband Customers

• ✓ Bundled discounts with BT Business broadband (up to 15% off)
• ✓ Runs on the EE network — excellent coverage
• ✓ Single bill for broadband, landline, and mobile
• ✗ Most expensive standalone SIM only pricing
• ✗ Limited plan flexibility compared to direct EE
• ✗ Long contract terms with early termination fees

Best for: Existing BT Business broadband and landline customers who want a single supplier and consolidated billing.

How Do I Choose the Right Data Allowance for My Business?

Choosing the right data tier is crucial — overpay and you’re wasting budget, underpay and your team hits costly out-of-bundle charges. Here’s a practical guide:

Pro tip: Most businesses find that a mix of data tiers across their team delivers the lowest total cost. Connection Technologies can build a bespoke multi-tier plan across any network — request a tailored quote to see your exact savings.

Can I Get a Cheaper Deal Through a Business Telecoms Broker?

Yes — and often significantly cheaper. Authorised business telecoms partners like Connection Technologies have access to wholesale and partner-exclusive tariffs that are not available when ordering directly from the networks. This is because networks incentivise partners to acquire and manage business accounts in bulk.

Typical savings through a broker versus ordering direct:

• 1–4 SIMs: 5–15% below direct network pricing
• 5–19 SIMs: 15–25% below direct pricing
• 20+ SIMs: 20–35% below direct pricing, plus bespoke contract terms

Beyond price, working with a specialist like Connection Technologies gives you a single point of contact for all your business mobile, broadband, and VoIP needs — meaning fewer suppliers to manage and faster issue resolution.

What About 30-Day Rolling Business SIM Only Contracts?

If you don’t want to commit to a 24-month term, several networks offer 30-day rolling business SIM plans. These provide maximum flexibility — ideal for seasonal workers, contractors, or businesses testing a new network before committing.

However, 30-day contracts typically cost 15–25% more per month than equivalent 24-month deals. Here’s a quick comparison for 20GB plans:

• O2 Business 30-day: £18/mo (vs £14/mo on 24-month)
• Three Business 30-day: £17/mo (vs £14/mo on 24-month)
• Vodafone Business 30-day: £16/mo (vs £12/mo on 24-month)

Our recommendation: If you need flexibility, start on a 30-day plan with Vodafone (£16/mo for 20GB), then switch to a 24-month contract once you’re confident in your usage and coverage. Connection Technologies can arrange this transition seamlessly — get in touch.

5 Tips for Getting the Cheapest Business SIM Only Deal in 2026

1. Audit your current usage: Check your team’s actual data consumption over the past 3 months. Most businesses overestimate by 30–40%, which means you’re paying for data nobody uses.
2. Mix data tiers: Not every employee needs the same plan. Assign 1GB plans to office-based staff and unlimited to field workers.
3. Order in bulk: Networks offer increasingly aggressive discounts as your SIM count rises. Even moving from 4 to 5 SIMs can unlock a new pricing tier.
4. Use a broker: Authorised partners like Connection Technologies access wholesale rates and can negotiate on your behalf at no extra cost to you.
5. Time your switch: The best deals appear in January, April, and September when networks push to hit quarterly targets. April 2026 is an excellent time to negotiate.

Should I Choose a Business SIM Only Deal or a Business Mobile Contract?

If your team already has functional handsets, a SIM only deal will almost always be cheaper. A typical business mobile contract with a handset included costs £30–£55/mo, whereas an equivalent SIM only plan costs £12–£26/mo. That’s a saving of £18–£29 per user, per month.

However, if your team needs new devices, a bundled business mobile contract can spread the handset cost interest-free, which may be preferable for cash flow. Connection Technologies can advise on the most cost-effective approach for your situation.