Best business phone systems UK (2026): how to choose, 14 ranked

A business phone system gives your team one set of business numbers, and rules for who answers, what happens when nobody does, and where the record of each call lives. In 2026 almost every UK system runs over the internet. The choice is no longer landline or VoIP. It is which kind of internet phone system fits the way your team works.

This guide does three things. It helps you find the type of system you need in four questions. It ranks 14 providers that sell to UK businesses, using their published UK prices. And it explains the UK rules that change what you should buy: the switch-off, 999, number porting and your contract rights.

The old copper phone network switches off. Openreach says there is no extension.

31 Jan 2027

Openreach, 31 July 2026

Business premises still on the old network in July 2026, out of about 1.5 million lines.

350,000

Openreach, 31 July 2026

Openreach's wholesale line rental after the final rise on 1 October 2026. An old line costs more every month you keep it.

2×

Openreach, 31 July 2026

The most service you can lose when you move your number, once the port is ready. You keep the number.

1 working day

Ofcom General Conditions, C7

Find the right phone system in four questions

Answer four questions. The shortlist re-ranks as you click, using the same scores as the full ranking below.

The best business phone systems in the UK, ranked

We scored each provider on six things a UK business needs, using the facts on its own UK pricing page. Cost is the monthly bill for a team of five on a no-contract plan. How we ranked them shows every rule.

Line wrote this guide and Line is in the ranking. No provider paid to be included or to change its position. Every competitor price links to its source.

What will a business phone system cost your team?

Headline prices hide the real cost. Enter your team size and how much you use the phone. The calculator shows the monthly and yearly bill for every provider in the ranking, with or without VAT.

The calculator covers the subscription and normal UK calls. Budget for these too:

• Desk phones: £45 to £150 each to buy. Some providers only rent handsets on a multi-year contract.
• Extra numbers: usually £1 to £6 a month for each extra local, 03 or 0800 number.
• Setup fees: most self-serve providers charge none. Some, such as Dialpad, state that setup fees apply.
• AI answering: often a separate add-on. RingCentral's AI Receptionist, for example, is £32 a month for 100 minutes, then 40p a minute.
• Call recording and transcription: included on some plans, charged per minute or per user on others.
• VAT: almost every business price is quoted without VAT. Add 20 per cent if you cannot reclaim it.

How we ranked them

Each provider scores 0 to 5 on six criteria. The weights reflect what a UK team of 1 to 50 people needs most. The totals are out of 100.

The rules we followed:

1. Published facts only. Every score comes from the provider's own UK pricing, feature or help pages. Where a fact was not published, the provider does not score for it.
2. The plan a small team would buy. For each provider we priced the cheapest plan with UK outbound calls included and an auto attendant or ring group. Plans are priced on monthly billing with no contract, excluding VAT.
3. Cost is calculated, not judged. Each provider's cost is the monthly bill for five people who make or take about 200 minutes of calls and 50 texts a month each. Change those inputs in the calculator above.
4. Line is scored by the same rules. Line's price comes from its live pricing page, so the ranking moves if that price changes.
5. Public prices only. We left out GoTo Connect and Gamma Horizon because they publish no UK prices, and 3CX because it is software you host with a separate line provider. 8x8 is included because many buyers shortlist it, and it scores 0 for cost.

We checked every source on 29 September 2026. Prices change often. If you spot a fact that has changed, tell us at hello@useline.io and we will correct it.

What is a business phone system?

A business phone system is the service that runs your business phone numbers. It decides which people and devices ring when a customer calls, what happens when nobody answers, and where calls, voicemails and texts are recorded. Modern systems run in the cloud and ring apps on mobiles and laptops as well as desk phones.

There are five types sold in the UK:

How to choose a business phone system: seven steps

Features that matter, and what each one does for you

UK rules to know before you buy

The PSTN switch-off: 31 January 2027

Openreach switches off the old copper phone network on 31 January 2027. On 31 July 2026 it said "there is no extension to the deadline" and that around 1.5 million lines, including about 350,000 business premises, were still on the old network. Its wholesale line rental rose 20 per cent in April 2026 and 40 per cent in July 2026, and a final rise on 1 October 2026 doubles the price.

Anything that dials out over an old line stops working too: card machines, alarms, lift phones and fax machines. Check each one with its supplier. Our PSTN switch-off guide covers what to move and in what order.

999 and power cuts

A VoIP phone needs power and an internet connection. When either fails, so can a 999 call. Ofcom's General Conditions require VoIP providers to warn consumers and businesses with 10 or fewer people, in plain English, that 999 access "may cease if there is a power cut or power failure, or a failure of the internet connection". Providers must also offer a way to reach 999 for at least one hour in a power cut to customers who depend on their landline.

What to do:

1. Register the address where each number is used, so emergency services can find you.
2. Keep a charged mobile phone in the building. A mobile reaches 999 on any network with signal.
3. Ask the provider how 999 works on its app. Some apps cannot make emergency calls over Wi-Fi, and some services do not carry 999 at all.

Keeping your number

You can move almost any UK number to a new provider. Ofcom's General Conditions cover geographic, non-geographic and mobile number portability. Once a port is ready, the switch must happen within one working day, and any loss of service must not exceed one working day.

The wait before a port is ready varies. Onecom's published BT Wholesale lead times are 4 working days for a single line, 7 for several lines, 10 for lines with direct dial numbers, and 22 for complex setups. Some providers quote 20 working days or more. Order the port early and keep the old service running until the new provider confirms the move.

UK number types and what callers pay

An 084 or 087 number costs your customers extra, and many people know it. For most small businesses, a local, 03 or 0800 number is the better choice. A 07 number is the one that customers can text.

Contracts: your rights if 10 or fewer people work for you

Ofcom treats a business, charity or not-for-profit with 10 or fewer people as a microenterprise or small enterprise. You get these protections:

• A short contract summary before you sign.
• End-of-contract notifications, and an annual best tariff notice.
• A maximum initial commitment of 24 months.
• Notice of a contract change that is not to your benefit, and the right to leave without an early termination charge within one month of that notice.
• Since 17 January 2025, no inflation-linked or percentage-based price rises in new contracts. Any rise must be set out in pounds and pence.

A provider can ask you to agree in writing to give up some of these protections. Read the contract for that clause, and do not sign it without a good reason.

Call recording

UK businesses can record calls for listed purposes, such as keeping a record of what was agreed or checking standards, under the Investigatory Powers (Interception by Businesses etc.) Regulations 2018. You must make all reasonable efforts to tell callers. A recording is personal data, so you also need a lawful basis, a retention period and a privacy notice. Our guide to recording business calls in the UK covers what to put in place.

Watch out for US-first providers

Some of the best-known phone systems are built in the US, and their UK plans do not always include what a UK business expects. We found these limits on the providers' own pages on 29 September 2026:

• RingCentral does not offer SMS on UK numbers. Its community forum says it is planned.
• 8x8 says in its help pages that its app "does not support SMS chat on phone numbers from outside the United States and Canada".
• Dialpad says SMS is "only available in the United States and Canada" on its pricing page. Its help centre offers UK SMS as an add-on through sales.
• Vonage's business app sends SMS in the US and Canada only. UK texts need the Max plan's eSIM, and those texts do not sync with the main account.
• Quo (formerly OpenPhone) and Talkroute do not sell UK numbers at all.

UK mobile networks also block texts sent to UK mobiles from US-style numbers. If your customers text you, choose a provider that texts from a UK number.

How to switch without missing a call

Questions to ask any provider before you sign

1. What is the total monthly price for my team, including VAT, numbers and the features I need?
2. Is there a minimum term, a setup fee, or a charge to leave early?
3. Can I send and receive texts on my UK number? What about WhatsApp?
4. What happens to a call when nobody answers? Is AI answering included or extra?
5. How does 999 work on the app, and what happens in a power cut?
6. How long will it take to move my number, and do you charge for it?
7. What is the fair use limit on "unlimited" calls?
8. Can I use my own mobile and laptop, or must I buy handsets?
9. Who owns my numbers and call recordings if I leave?

Business phone systems by type of business

• Trades and field services: answer from the van and text a quote. See phone systems for tradespeople.
• Salons and barbers: bookings and reminders by text while your hands are busy. See salons and barbers.
• Clinics and practices: a front-desk number that never shows a personal mobile. See clinics and practices.
• Estate agents: one number for the branch and the agents out on viewings. See estate agents.
• Accountants and solicitors: client calls to one number, with notes the practice can see. See accountants and solicitors.
• Sole traders: a second number on the phone you already own. See a business phone number and a small business phone system.