This guide is for UK small business owners who need a reliable, professional phone system without wading through telecoms jargon or sitting through a sales pitch. You will learn exactly what types of system exist, what they cost, what features actually matter, and why the 2027 PSTN switch-off makes this decision more urgent than most business owners realise.
The short answer
- VoIP (Voice over Internet Protocol) is now the dominant choice for UK small businesses — lower cost, more features, works anywhere.
- Hosted PBX puts your phone system in the cloud; no on-site hardware, no IT team required.
- Traditional PSTN and ISDN lines are being switched off in 2027 — if you are still on them, you need a plan.
- Costs range from around £6 to £25 per user per month for a hosted VoIP system, with no hardware investment for most setups.
- The right system should take days to set up, not months — and should not lock you into a long contract.
What types of business phone system are available in the UK?
There are four main categories, and understanding the difference will save you from making an expensive mistake.
Traditional landline (PSTN/ISDN)
These are the copper-wire systems that UK businesses have relied on for decades. They are reliable but inflexible, expensive to scale, and — critically — being switched off by Openreach in 2027. If your business still runs on PSTN or ISDN, that is not a small detail to file away. It is a fixed deadline.
On-premise PBX
A physical box installed in your office that manages calls internally and connects to outside lines. You own the hardware, which means you also own the maintenance, the upgrades, and the call-out fees when something goes wrong. For a business without an IT team, this is the hardest system to keep running well.
Hosted (cloud) PBX / VoIP
Your phone system lives in the cloud, managed by a provider. Calls travel over your internet connection. You access it from desk phones, computers, or mobile apps. This is the standard choice for UK small businesses in 2026 — and for good reason. There is no box to maintain, you add or remove users in minutes, and you can take calls from anywhere.
Mobile-first systems
Some small businesses manage entirely through business mobile contracts or apps like Microsoft Teams Phone. These work well for very small or fully remote teams but tend to lack the call routing, reporting, and number management that growing businesses need.
For most UK SMEs — a team of 5 to 50 people, working from an office or split across home and office — hosted VoIP is the clear answer. The reasons to switch to VoIP go beyond cost: it is the only category actively improving, while everything else is either static or being decommissioned.
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What is a hosted VoIP phone system — and how does it work?
VoIP stands for Voice over Internet Protocol. Instead of sending your voice down a copper telephone line, it converts the call into data packets and sends them over your broadband or leased line connection. The result sounds identical to a traditional call — often better.
Hosted means the system itself runs on servers managed by your provider, not in a box on your wall. You connect to it via the internet, which is why it also gets called a cloud phone system.
Here is what the setup looks like in practice. Your team uses either a physical IP desk phone, a softphone app on their laptop, or a mobile app on their smartphone. When a call comes in to your business number, the hosted system handles all the routing — sending it to the right person, playing your hold music, managing voicemail, and logging the call — before it ever reaches the device.
The business number itself is a virtual number. It is not tied to a physical line or a specific location. You can have a local area code for the South Coast, a national 03 number, or both, regardless of where your team actually sits.
What you need to make it work:
- A stable broadband connection (most standard fibre connections handle VoIP without issue)
- A router that does not heavily throttle UDP traffic
- IP desk phones, a computer, or a smartphone — your choice
That is it. No engineer visit, no rack of hardware, no specialist. A competent provider will get you live within a working week.
How much does a business phone system cost?
Cost is where hosted VoIP genuinely changes the picture for small businesses.
Traditional systems typically require upfront hardware costs of £500 to £3,000 depending on the size of the office, plus line rental, plus call costs, plus maintenance contracts. Scaling up means calling an engineer. Scaling down means writing off hardware you already paid for.
Hosted VoIP operates on a per-user monthly subscription. Call costs are often included or very low. There is no hardware to buy if your team uses laptops or mobiles, though quality IP desk phones can be purchased for £40 to £120 per handset if preferred.
Here is what to expect from the UK market in 2026:
| Tier | Typical price | What you get |
|---|---|---|
| Entry level | £5–£8 /user/month | UK calls included, basic features, mobile app |
| Mid tier | £12–£18 /user/month | Advanced call routing, CRM integrations, call recording |
| Full featured | £22–£28 /user/month | Everything plus analytics, multi-site, priority support |
Hidden costs to watch for: setup fees, number porting charges, per-minute charges on top of a subscription, and — the most damaging — long minimum-term contracts that lock you in for 24 or 36 months before you have even tested whether the system works for your business.
A 28-day rolling contract with a free trial period is the standard to hold providers to.
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What features do UK businesses actually need?
The feature lists on most provider websites run to 50+ items. Very few of them matter for most small businesses. Here is what actually makes a day-to-day difference.
Hunt groups and call queues
When a customer calls your main number, it rings the right people — not just one desk. Hunt groups can ring sequentially (person A, then B, then C) or simultaneously. This alone reduces missed calls dramatically.
Auto-attendant (IVR)
“Press 1 for sales, press 2 for accounts.” A professional greeting menu that routes callers without tying up a receptionist. Even a two-person business benefits from this — it sets the right impression immediately.
Call recording
Essential for compliance in many sectors, and useful for training in almost all of them. Check that your provider stores recordings securely and that you can access them easily.
Mobile and desktop apps
Your team should be able to take business calls from their mobile without giving out personal numbers. A good softphone app makes this invisible — callers see your business number, not a personal mobile.
Number porting
If you already have a number, you need to be able to bring it with you. This is a standard process but some providers make it difficult or charge heavily. Confirm it is included before you sign anything.
Voicemails delivered as audio files to your inbox. Sounds simple, and it is — but it is the kind of feature that saves real time across the week.
Call analytics and reporting
Knowing how many calls you missed, when your busy periods are, and how quickly calls are answered gives you data to make decisions. Even basic reporting turns guesswork into management.
Features like video conferencing, team messaging, and CRM integrations are genuinely useful for some businesses and unnecessary for others. Start with what you actually need, and make sure you can add more without switching providers.
What happens to your phone system after the 2027 PSTN switch-off?
The 2027 PSTN switch-off is not a rumour or a distant concern — it is a confirmed, industry-wide infrastructure change. Openreach, which operates most of the UK’s telephone network, is decommissioning the old copper network. Every PSTN and ISDN line in the country will stop working.
If your business currently runs on a traditional landline or an ISDN-based PBX, you have two options: migrate to a hosted VoIP system before the deadline, or be forced into it at the last minute under pressure. The latter typically means rushed decisions, poorer deals, and disruption to your phone service during the busiest periods.
What the switch-off means in practice:
- Your existing landline numbers can be ported to VoIP — you do not lose them
- On-premise PBX systems that rely on ISDN will stop working entirely
- Some older analogue alarm systems, card payment terminals, and lift lines are also affected — check any device that uses a phone line
The businesses that migrate early get the best choice of providers, the most time for a clean number port, and the chance to improve their phone setup rather than just replace it. Those that leave it until late 2026 or 2027 will be joining a very long queue.
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How VoIP Ninjas compares
VoIP Ninjas is a direct provider — we operate our own platform rather than reselling another company’s infrastructure. That distinction matters because it removes a layer of cost and a layer of delay. When something needs fixing or changing, it gets done directly, not relayed through a chain.
Here is exactly what we offer in 2026:
Ronin — £5.99/user/month
The starting plan for small teams that need reliable VoIP without complexity. Unlimited UK calls, mobile app, voicemail to email, and a UK number included. No frills, no fuss — just a phone system that works.
Samurai — £14.99/user/month
The most popular plan for growing SMEs. Everything in Ronin plus call recording, hunt groups, auto-attendant, call analytics, CRM integration, and multi-device support. This is the plan where most South Coast businesses find their operational step-change.
Shogun — £24.99/user/month
For businesses that need everything. Advanced call routing, multi-site management, dedicated account support, SLA-backed uptime, and full reporting. Suited to businesses handling high call volumes or operating across multiple locations.
Connectivity
If your team relies on the phone for the business, your broadband connection is not something to leave to chance. We offer leased lines from £149/month — a dedicated, symmetric fibre connection that is not shared with other businesses and does not slow down at peak times.
The contract position
Every VoIP Ninjas plan runs on a 28-day evergreen contract. No 24-month lock-in, no early termination fees, no minimum spend commitments. If the system does not work for your business, you leave — we would rather keep customers because the product is good than because the contract makes leaving painful.
The trial
Try any plan free for 14 days. No credit card required. You get access to the full platform so you can test it against real calls with your real team before committing a penny.
See how we compare to BT Business and other legacy providers →
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Frequently asked questions
Can I keep my existing business phone number when switching to VoIP?
Yes — in almost every case, your existing number can be ported to a VoIP system. Number porting is a regulated process in the UK, which means your current provider is legally required to release your number. The process typically takes 5 to 10 working days. At VoIP Ninjas, we handle the port on your behalf at no additional charge, and we keep your old line active until the port is complete so there is no gap in service.
Do I need special hardware to use a hosted VoIP phone system?
Not necessarily. Most hosted VoIP systems work through a softphone app on a computer or smartphone, which means your team can be up and running with no hardware purchase at all. If you prefer physical desk phones, IP handsets start at around £40 and connect directly to your network via a standard ethernet cable. There is no on-site PBX equipment to install or maintain.
How reliable is VoIP compared to a traditional landline?
On a quality internet connection, VoIP call quality is equal to or better than a traditional landline. The critical factor is your broadband connection — specifically upload speed and latency, not just download speed. A standard fibre connection handles VoIP comfortably for most teams. For businesses where call reliability is mission-critical, a leased line removes all shared-network variability. VoIP Ninjas leased lines start from £149/month and provide a dedicated, symmetric connection.
What is the difference between a hosted PBX and a traditional PBX?
A traditional PBX is a physical piece of hardware installed on your premises that manages your phone extensions and connects to outside lines. You buy it, you maintain it, and when it breaks you pay for an engineer. A hosted PBX is the same functionality running on servers managed by your provider — accessed over the internet. You pay a monthly subscription, there is nothing to maintain, and your provider handles system updates, redundancy, and security. For a small business without dedicated IT support, hosted PBX is the straightforward choice.
Is now the right time to switch, or should I wait until closer to the 2027 deadline?
Switching now is the better move for most businesses. Providers are busiest — and least flexible on pricing and timelines — as the 2027 deadline approaches. Switching now also gives your team time to get comfortable with the new system without pressure. The 2027 PSTN switch-off is a fixed date, not a moveable one, and the businesses that migrate on their own schedule rather than the network’s are the ones that come out of it better. A 14-day free trial with no card required makes it straightforward to assess your options without any risk.
### Get a free quote in 60 seconds
No tie-in, no setup fees. Most businesses are fully live within 10 working days.
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