Best business phone systems for UK small businesses (2026)

Choosing a business phone system is no longer just about making calls. It affects your costs, how easily customers reach you, how your team works from home or on the road, and the first impression people get when they ring. It is also a decision you may have to make soon anyway, because the UK's copper phone network is being retired, with the switch-off due to complete by 31 January 2027.

This guide explains the main types of business phone system, the features worth paying for, how to choose between them and how to switch without missing a call.

Key takeaways

• For most small UK businesses the best choice is a hosted VoIP phone system running on reliable broadband.
• A good system rings on desk phones, laptops and mobiles, so staff can work from anywhere with one business number.
• Features that matter most: call menus, call groups, out-of-hours routing, voicemail to email, mobile app and call reporting.
• You can keep your existing number. The new provider arranges the transfer.
• Compare total monthly cost, contract length, support and who you speak to when something breaks, not just the headline price.
• Plan for internet and power cuts, and check how 999 calls work.

Why does your phone system matter?

If you are still on a traditional landline, or juggling several mobile numbers, an upgrade pays off in three ways.

• Cost. Hosted systems typically charge per user with UK calls usually included, instead of line rental on every number plus call charges. The best way to see the saving is to compare a quote with your current bills.
• Flexibility. Whether you run a remote team, take calls on the road or work from a shared space, modern systems follow the person, not the desk.
• Scalability. Adding or removing a user takes minutes, and you do not have to change number or sign up to a long contract just to grow.

For the basics of how it all works, read our VoIP guide.

Which features should you look for?

Not every business needs every feature, but these are the ones small UK teams find most useful.

1. Call routing and an auto-attendant. Callers press 1 for sales or 2 for support and are sent to the right person or group. It makes even a very small business sound professional.
2. Voicemail to email. Missed a call while with a client? The message arrives in your inbox as audio or a transcript.
3. Mobile and desktop apps. Take your business line anywhere, and make calls showing your business number instead of your personal mobile.
4. Call reporting. See your busiest times and how quickly calls are answered, so you can staff properly and improve service.
5. CRM integration. If you use HubSpot, Salesforce or a similar tool, linking it to your phones saves time and logs conversations automatically.
6. Call recording. Useful for training and records, but it brings legal duties. See our guide to GDPR and call recording.
7. Team messaging and video. Often included, which can replace a separate meeting tool.

Types of business phone systems

1. Hosted VoIP (cloud phone system)

Your numbers and call handling live in the provider's data centre. You use desk phones, apps or both. There is nothing to maintain in your office.

Best for: most small and growing businesses, hybrid teams, businesses with more than one site.

2. Microsoft Teams Phone

If your team already works in Microsoft 365, Teams can make and receive normal phone calls with an add-on licence and a calling plan or an Operator Connect provider.

Best for: businesses that live in Teams all day. Watch out for: licensing complexity and fewer call-centre features than a dedicated phone system.

3. On-site PBX

A traditional private branch exchange with equipment in your office. Many are now hosted, which blends the old and new models.

Best for: businesses with specific integration needs and in-house IT. Watch out for: older ISDN-based systems stop working at the copper switch-off.

4. Mobile-based systems

Business calls routed through an app on your existing mobile plan.

Best for: sole traders and small field teams. Watch out for: no shared call queues, and personal and business calls can get mixed.

How do the options compare?

How do you choose the right system?

Ask yourself:

• Do I need to take calls from anywhere?
• Will the team grow soon?
• Do I need call menus, call groups or voicemail to email?
• Do I use a CRM or other software I want to connect?
• What happens to calls if my internet or power fails?

Tips by business type:

• Consultants and services: hosted VoIP with a mobile app, call scheduling and CRM integration.
• Remote and hybrid teams: hosted VoIP with team messaging and video.
• Retail and hospitality: simple hosted VoIP with an auto-attendant and voicemail to email.
• Offices with existing Microsoft 365: compare Teams Phone against a hosted system on cost and features.

When you compare suppliers, check:

• Pricing: clear monthly fees with no hidden extras, and what is included in calls.
• Contract: length, notice period and exit charges.
• Support: UK-based, easy to reach, and one named contact.
• Setup: who handles number porting, handsets and call flows, and how long it takes.
• Resilience: backup connection, mobile forwarding and 999 handling.

How do you switch without losing calls?

1. List every number and every device on a phone line, including alarms and card machines.
2. Check your current contract end dates and notice periods.
3. Check and, if needed, upgrade your broadband first. Our FTTP guide explains the options.
4. Build the new system in parallel, with users, menus and voicemail ready.
5. Port your numbers and test calls on the day.
6. Cancel the old lines once everything works.

Read our guide on alternatives to BT for more on the switch-off and what else stops working.

How PurpleBox can help

PurpleBox supplies and supports hosted business phone systems for UK businesses, with the handsets, broadband and security to match. We handle the audit, number porting, call flows and training, and we stay your single point of contact afterwards.

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Frequently asked questions