The SME Guide to Choosing Business Telephone Systems in the UK (2027)

Objective

Help UK SMEs understand telephone systems in plain English before the 2027 copper switch-off, so they can compare hosted telephone systems against a traditional PBX telephone system and choose confidently, without the sales talk.

Key Takeaways

• The UK’s copper phone network shuts down on 31 January 2027. Any business still running old telephone systems on ISDN or PSTN lines needs to move before then.
• Hosted telephone systems run over broadband or a dedicated internet line, not copper wires. Calls, voicemail and call routing all live in the cloud.
• A modern PBX telephone system can now be hardware-free. Most SMEs use a cloud-hosted version instead of a physical box in a server cupboard.
• Pricing for small business telephone systems UK-wide usually runs from around £10 to £25 per user, per month, depending on features and call bundles.
• Look for call handling, mobile app access, CRM integration and clear contract terms before signing with any provider.

Table of Contents

1. What Are Telephone Systems, and Why Does Every UK Business Need One?
2. How Do Business Telephone Systems Actually Work?
3. What Are the Main Types of Office Telephone Systems?
4. Where Do SMEs Actually Use These Systems Day to Day?
5. What Benefits Do Hosted Systems Bring to a Growing Business?
6. What Should You Look for When Buying a Phone System?
7. How Much Do Phone Systems for Business Cost in the UK?
8. FAQs

A missed call from a customer rarely feels like a big deal at the time. Then you find out it was a £4,000 order, and they’d already rung your competitor by lunchtime.

That’s the real cost of running outdated telephone systems. Not the monthly bill. The calls that never got answered, the voicemails nobody checked, and the staff working from home who couldn’t take calls at all.

Add the UK’s landline switch-off into the mix and the pressure is real. Copper-based PSTN and ISDN lines are being retired by 31 January 2027. According to the House of Commons Library, the number of landline customers still on the old PSTN network fell from 5.2 million in July 2024 to 3.2 million in July 2025, as providers push the migration forward. If your business hasn’t moved yet, this guide will help you get it right the first time. 

1. What Are Telephone Systems, and Why Does Every UK Business Need One?

A telephone system is the setup your business uses to make, receive and manage calls. That’s it. No jargon needed.

For decades, this meant a physical box wired to copper lines from the street. Today, most business telephone systems run over the internet instead. Calls travel as data, not analogue signals.

Every business needs one because customers still call before they email. A takeaway shop, a law firm and a scaffolding company all live or die by whether the phone gets answered. The system behind that call matters more than most owners realise.

2. How Do Business Telephone Systems Actually Work?

Modern systems send your voice as data packets over broadband, not copper cable. This is called VoIP, or Voice over Internet Protocol.

Your provider hosts the technology in the cloud. You get:

1. A phone number, or several, tied to your business rather than a physical wall socket.
2. Desk handsets, softphone apps, or both, all registered to that number.
3. A web portal where you set call routing, voicemail and opening hours.

Staff can pick up calls on a desk phone in the office, an app on their mobile, or a laptop headset at home. All three ring off the same number. That’s the shift from old office telephone systems to today’s flexible setup.

3. What Are the Main Types of Office Telephone Systems?

Three main options exist for UK businesses in 2027, and they suit different needs.

Hosted (cloud) systems
No hardware on site. The provider manages everything remotely, and you pay a monthly fee per user. This is now the default choice for most SMEs.

On-premise PBX
A PBX telephone system installed physically at your office. Common in larger firms with an IT team, but harder to justify with the copper switch-off approaching.

Hybrid setups
A mix of cloud calling with some on-site hardware, often used by businesses mid-way through an office move or merger.

Type	Best for	Setup cost
Hosted VoIP	Most SMEs, remote teams	Low
On-premise PBX	Large offices, heavy call volume	High
Hybrid	Businesses in transition	Medium

For most small and mid-sized firms, hosted telephone systems win on cost, flexibility and how quickly they can be set up.

4. Where Do SMEs Actually Use These Systems Day to Day?

This isn’t theoretical. Here’s where telephone systems for small business earn their keep:

• Reception and enquiries – routing new customer calls to the right team without a receptionist manually transferring them.
• Remote and hybrid teams – staff answering the main business line from home using a mobile app.
• Multi-site retail or trade businesses – one central number, calls distributed across branches based on availability.
• Client-facing professional services – call recording for compliance, plus voicemail-to-email so nothing sits unheard overnight.
• Seasonal or growing teams – adding or removing users in minutes, without an engineer visit.

A trades business with three vans and one office landline, for example, can route calls straight to whichever team member is free, rather than losing the job to voicemail.

5. What Benefits Do Hosted Systems Bring to a Growing Business?

The advantages go beyond simply making calls.

1. Lower running costs – no line rental for physical copper, and inclusive call bundles reduce per-minute charges.
2. Scale without disruption – add a new starter’s extension in the portal, no engineer callout required.
3. Work from anywhere – the same business number follows staff between office, home and site visits.
4. Better customer experience – call queuing, hold music and out-of-hours messages all sound professional from day one.
5. Built-in resilience – if broadband drops at one location, calls can reroute to mobiles automatically.

These aren’t small conveniences. For a ten-person business, missed calls during a broadband outage can mean real lost revenue in a single afternoon.

6. What Should You Look for When Buying a Phone System?

Before signing anything, check these points carefully.

• Contract length – some providers lock you in for 36 months. Ask for shorter terms if you’re unsure about growth plans.
• Call quality guarantees – ask what happens if call quality drops, and what the provider’s fix time looks like.
• Number portability – confirm your existing business number can move across without downtime.
• Integration – check if it connects with your CRM, helpdesk or booking software.
• Support hours – find out if support is UK-based and available outside 9 to 5.
• Hardware options – decide if you need desk phones, or if app-only calling covers your team.

A genuine, independent comparison across providers is the fastest way to avoid overpaying. This is exactly the kind of decision Arc Communications helps SMEs work through, comparing real UK providers rather than pushing one preferred supplier.

7. How Much Do Phone Systems for Business Cost in the UK?

Pricing varies by provider, user count and included features, but here’s a realistic range for 2027.

• Per-user hosted VoIP: roughly £10–£25 per month, per user.
• Call bundles: UK landline and mobile minutes are usually included; international calls cost extra.
• Setup fees: many providers now waive these, especially for switch-off migrations.
• Hardware: desk phones typically cost £40–£150 each if purchased outright, or can be included in the monthly rate.

A 10-person office might expect to pay somewhere between £150 and £300 a month all-in, depending on features like call recording or a dedicated account manager. Comparing quotes properly, rather than accepting the first renewal offer from your current provider, regularly saves businesses hundreds of pounds a year. Arc Communications compares pricing across the whole of the market, including connectivity options that pair with your new phone setup, to find the best combined deal.

 

Copper lines are being switched off whether businesses are ready or not. Waiting until closer to January 2027 means less choice, longer install queues, and less time to train staff on a new system. Get a free comparison quote from Arc Communications and see what a modern setup would actually cost your business, with no obligation attached.

FAQs

Q1. Will my business phone number change if I switch systems?
No, in almost every case your existing number moves across through a process called porting. Your provider handles the transfer, and there’s usually a short overlap period so you never lose calls.

Q2. Do I need new hardware for a hosted telephone system?
Not always. Many businesses keep using their existing handsets if they’re compatible, or switch to app-based calling on phones and laptops instead. It depends on what you already have and how your team prefers to work.

Q3. What happens to my alarm or card machine that uses the phone line?
Anything wired into the old copper network, including alarms, door entry and some card readers, needs checking before switch-off. Most have digital replacements, but this is worth confirming with your equipment supplier directly.

Q4. Is VoIP reliable if my internet goes down?
Good providers offer automatic failover to mobile networks or a backup connection, so calls keep coming through even if broadband drops. Ask any provider specifically how failover works before signing up.

Q5. How long does it take to set up a new business phone system?
Most hosted systems can be live within one to two weeks, including number porting and staff training. On-premise setups with physical hardware usually take longer.

Conclusion

The 2027 deadline isn’t the reason to switch, it’s just the reminder. The real reason is that a modern phone setup answers more calls, costs less to run, and keeps your team connected wherever they’re working from. If your current system still runs on copper, or you’re simply not sure what you’re paying for, speak to Arc Communications for an honest, whole-of-market comparison before renewal time catches you out.