Cheapest Business Mobile Deals Under £10/Month

Last updated: March 2026 • Reviewed by Compare The Networks

Best Business Mobile Deals Under £10 Per Month

You do not need to spend a fortune to get a reliable business mobile. In 2026, all four major UK networks offer SIM only business plans under £10 per month (ex-VAT). These plans include calls, texts, and enough data for everyday business use — plus they are fully VAT-reclaimable.

Whether you are a sole trader watching every penny or a business manager provisioning backup phones, sub-£10 plans deliver excellent value. Below we compare every option available.

Under £10 Business SIM Only Comparison

Prices correct as of February 2026. All prices shown ex-VAT as standard for business contracts. Annual RPI price increases apply.

Who Are Sub-£10 Plans Best For?

• Sole traders with low data needs who primarily use Wi-Fi
• Second business lines where you need a separate number but not heavy data
• Temporary workers or seasonal staff who need short-term connectivity
• Backup phones for business continuity
• Businesses with multiple lines where you want the lowest per-line cost

How to Choose the Right Budget Plan

Check Your Data Usage First

If your employees primarily use Wi-Fi in the office, 1-5GB is plenty. For workers who are out and about, 10GB gives a comfortable buffer. If you need more than 10GB, Three’s unlimited plan at £10 is the clear winner.

Consider Contract Length

24-month contracts offer the lowest monthly prices, but 12-month and 30-day options give more flexibility. If you are unsure about your needs, start with a shorter contract.

VAT Savings Add Up

As a business, you reclaim 20% VAT on your mobile costs. A £8/month plan effectively costs £6.40/month after VAT reclaim — that is less than a coffee per week for a complete business mobile line.

Network-by-Network Breakdown Under £10

Three (From £6/month)

Three is the clear budget leader. Their 1GB plan at £6/month is the cheapest business SIM available. For just £4 more, you can jump to unlimited data at £10/month — the best value deal on the market. All Three business plans include 5G, unlimited calls and texts, and EU roaming. The main consideration is coverage: Three is strong in cities but can be weaker in rural areas.

O2 (From £7.50/month)

O2’s 5GB plan at £7.50/month on a 12-month contract is an excellent mid-range option. You get more data than Three’s entry plan, a shorter contract commitment, and access to O2 Priority rewards. O2’s coverage is reliable in urban and suburban areas, and their business portal makes it easy to manage multiple lines if you scale up later.

Vodafone (From £8/month)

Vodafone’s 10GB plan at £8/month offers the best data-to-cost ratio under £10. You get double the data of O2’s cheaper plan for just 50p more. Vodafone business plans also include their Xtra benefits programme and excellent international roaming in 83 destinations — making this a strong choice if any employees travel abroad.

EE (From £9/month)

EE’s 10GB plan at £9/month comes with the UK’s widest 4G and 5G coverage. If your team works across rural and urban areas, EE’s network reliability is worth the small premium. EE also offers the fastest average download speeds and the Smart Benefits programme with perks like Apple Music or extra data.

Real-World Cost Savings

A sub-£10 business mobile saves you more than the sticker price suggests. Here is the true cost breakdown for a £8/month plan:

For a business with 10 lines, the savings are £576 per year compared to equivalent personal contracts. This compounds further with multi-line volume discounts.

Looking for more options? Compare all business SIM only deals, cheap business mobiles with handsets, or get a free personalised quote.