Business mobile cost is more than the monthly price
Business mobile cost looks simple on a network’s website: a data allowance, a price, a button. The figure you end up paying per line over the life of the contract is usually a different number, and the gap is made of things that are all in the small print.
This guide breaks your business mobile cost into its parts, using prices read on the networks’ own business pages on 13 November 2026. They’re examples of how plans are priced, not a ranking, and they’ll change. Use them to learn what to look for, then check live prices before you sign.
How much does a business mobile line cost?
The SIM only plans we’ve picked out below run from £12 to about £29 a month per line before VAT, depending mostly on data. Both pages list pricier plans above that, and a handset and annual rises add more again.
| Network page | Plan as listed | Monthly price shown |
|---|---|---|
| O2 Business Shop | 2GB SIM, 24 month Classic Business Plan | £12 ex VAT |
| O2 Business Shop | 10GB SIM, 24 month Classic Business Plan | £14 ex VAT |
| O2 Business Shop | Unlimited SIM, 24 month Classic Business Plan | £15.50 ex VAT |
| Vodafone Business | 50GB Red SIM only | £17.50 ex VAT |
| Vodafone Business | 100GB SIM only, maximum download 100Mbps | £20 ex VAT |
| Vodafone Business | Unlimited SIM only, maximum download 100Mbps | £29.17 ex VAT |
Prices as shown on each network’s business shop page, checked 13 November 2026. Both pages state that their prices exclude VAT. Promotions were running on both pages, so the same plan may be listed at a different price next week.
Notice what the table doesn’t tell you about business mobile cost. Unlimited data on one page is cheaper than 50GB on another. Plans with the same allowance differ on speed limits, roaming and contract length. Headline price is the start of working out your business mobile cost, not the end.
What pushes the business mobile cost up?
Five things do most of the work. Each one is visible before you sign, if you know to look.
The five parts of the real price
- VAT, which most business prices leave out.
- The annual price rise written into the contract.
- The handset, if you take one, and how long you pay for it.
- Contract length, which trades a lower price for less freedom.
- Extras such as roaming, security tools and faster speeds.
Annual rises
Vodafone’s business SIM only page prints the future price under each plan. The 50GB plan listed at £17.50 ex VAT is shown rising to £19.58 on 1 April 2027 and £21.67 on 1 April 2028. That’s a rise of about £2.08 a month ex VAT each April, on every line. O2’s business shop takes a different approach. It says airtime goes up by a fixed £1.50 a month each year, reflected in your bill from 1 April.
Over a two year contract that changes your business mobile cost. A plan that starts at £17.50 is paying £21.67 by its second April, and it stays there until the term ends. Multiply by the number of lines and the difference is no longer small change. When you compare quotes, compare the price in each year, not only the first.
Handsets and contract length
O2’s business shop lists phone deals on a 36 month device contract with a 36 month airtime plan. Spreading a phone over three years lowers the monthly figure and raises the commitment. If staff turnover is high or the business is young, a shorter term or SIM only with phones bought separately may suit you better. Our business iPhone buying guide covers that choice.
How does VAT change the business mobile cost?
If your business is VAT registered, you can usually reclaim the VAT on line rental, so the ex VAT price is close to your true business mobile cost. If you aren’t registered, you pay the VAT and can’t claim it back, so your real price is higher than the one on the page.
HMRC’s internal manual on mobile phones sets out the position for employers. It says spending on line rental is treated as being for business purposes, and the VAT on that part of the bill is input tax. The VAT on calls is also input tax where the employer has a policy that private use isn’t allowed.
Where private use is allowed, HMRC says you should decide whether the amount of private use means the VAT on calls should be apportioned. It says the method should be kept simple and shouldn’t put a substantial record keeping burden on the business, and that a straight percentage based on a representative sample is likely to be acceptable.
That’s guidance written for HMRC staff, not tax advice for your firm. Sole traders who use one phone for work and home should check their own position with an accountant. Our sole trader mobile guide explains the contract side.
How to work out your own cost per line
You don’t need a spreadsheet model to find your business mobile cost. You need five numbers for each quote, written side by side.
Start with the monthly price ex VAT. Add the rise for each April the contract covers. Add any handset cost and any upfront fee. Add the extras you’d actually use. Then divide the total over the full term by the number of months. That figure, per line, is your business mobile cost.
Do it for a SIM only quote as well, even if you want new phones. It shows you what the handsets are really costing, which the bundled price is designed to blur.
Then check what you’re using. Many firms pay for allowances nobody touches. Our guide on how to reduce business mobile costs covers trimming a bill you already have, and what to check before you sign a business mobile deal covers your rights on contracts and price rises.
Frequently asked questions about business mobile cost
- Is a business mobile plan cheaper than a personal one?
- Not automatically. Business prices are usually shown before VAT, which makes them look lower. Compare on the same basis, and compare what’s included, such as support, roaming and the ability to manage several lines on one account.
- Do business mobile prices go up during the contract?
- Often, yes. Vodafone’s business SIM only page shows each plan’s price for April 2027 and April 2028 under the current price, and O2’s business shop states a £1.50 a month airtime rise each April. Check the same detail in any quote you’re given.
- Can I claim the VAT back on staff mobile phones?
- HMRC’s manual says VAT on line rental is input tax, and VAT on calls is too where private use isn’t allowed. Where private use is allowed, the VAT on calls may need to be apportioned. Check your own position with an accountant.
- What is the cheapest way to add a line?
- SIM only is normally the lowest monthly price because there’s no handset to pay for. Whether it’s the lowest total depends on what the phone would cost you bought separately.
Sources
- Vodafone Business, “Business SIM Only Deals”. Plan prices ex VAT, the maximum download speeds shown and the prices listed for 1 April 2027 and 1 April 2028. The page shows no date. Prices read 13 November 2026.
- O2 Business Shop. SIM plan prices on a 24 month Classic Business Plan, the statement that all prices exclude VAT at 20%, the £1.50 annual airtime rise from 1 April and the 36 month basis of its phone deals. The page shows no date. Prices read 13 November 2026.
- HMRC internal manual, VIT43940, “Specific issues: mobile phones”, published 13 April 2016, last updated 4 June 2026. VAT on line rental and calls, and apportionment where private use is allowed.
Checked 13 November 2026.
