Is VoIP Cheaper Than a Business Landline in the UK?

By Olivia Johnson - Trusted UK Business Expert

Last Updated 10th of June 2026

4 minute read

Choosing the right phone system for your business can save you money and improve how you work. Many companies in the UK are asking if switching to VoIP is cheaper than sticking with a business landline. We’ll explain everything clearly so you can decide with confidence.

VoIP is generally cheaper than a business landline in the UK. It has lower call costs, fewer set-up fees, and flexible monthly contracts. Landlines often have higher fixed charges, installation fees, and per-minute call rates, making VoIP more cost-effective for most businesses.

But cost is not the only factor. Reliability, features, and scalability also matter. Let’s take a detailed look at how VoIP compares to a business landline so you can find the best fit for your office.

Get a clear breakdown of costs and features to see which option fits your budget and office setup best. 👇 Click below to explore the latest Business Landline deals in the UK.

Is VoIP Cheaper Than a Business Landline in the UK?

When businesses look at phone systems, cost is often the first question. A traditional business landline works through copper or fibre wires and requires a contract with a telecom provider. VoIP (Voice over Internet Protocol) uses your broadband connection to make and receive calls.

The cost difference comes from how each system works. A landline needs physical infrastructure, which makes installation, rental, and maintenance expensive. VoIP only needs an internet connection, so it cuts these costs. Calls made with VoIP are usually much cheaper—sometimes even free when calling other VoIP users.

In the UK, the big shift is also linked to BT’s 2025 switch-off of traditional ISDN landlines. This means more businesses are moving to VoIP, not just for cost savings, but also because landlines will no longer be supported in a few years.

Comparing Costs: VoIP vs Business Landline

To make the comparison clearer, let’s break down the main costs:

From this breakdown, you can see that VoIP offers savings in most areas. A small company with 10 staff could save £150–£300 per month by switching. Over a year, that’s thousands in savings.

Why Is VoIP Cheaper?

• No physical lines needed – Calls are carried over the internet.
• Lower call rates – Especially for long-distance and international calls.
• Scalable pricing – Add or remove users without expensive installations.
• Free features – VoIP often includes voicemail-to-email, call forwarding, and video meetings, which are add-on costs with landlines.

This is why many start-ups and SMEs in the UK are adopting VoIP first, rather than investing in old-style landlines.

What About Reliability?

Cost matters, but so does reliability. Traditional landlines are known for strong call quality and stable connections. VoIP depends on internet speed. If your broadband is poor, VoIP can struggle with call drops or delays.

However, with fibre broadband now available in most UK towns and cities, VoIP reliability is catching up. Many providers also offer “failover systems” that switch calls to mobiles if your internet goes down, so you stay connected.

Which Is Better for Small Businesses?

For most small businesses, VoIP is not just cheaper but also more flexible. A shop with two phone lines can save over £50 a month by using VoIP. A growing tech company with remote staff can connect everyone without paying for multiple landlines.

Landlines may still be useful for businesses in rural areas with weak broadband, or for firms that need a backup system. But as fibre expands across the UK, even these companies are starting to switch.

The Future of Business Phones in the UK

With the BT ISDN switch-off in 2025, businesses will be forced to move away from traditional landlines. This means VoIP will soon be the default. Companies that switch earlier will enjoy lower costs and an easier transition.

Think of VoIP as more than just a cheaper phone line—it’s a full communication system. It allows calls, video, and messaging all in one. For companies that want to stay modern and save money, VoIP is clearly the smarter choice.

Cost Example: Small UK Office

Here’s a simple case study:

• Landline option: 3 lines at £20 each (£60/month), plus £100 average call charges = £160/month.
• VoIP option: 3 users at £10 each (£30/month), plus £40 call charges = £70/month.

This business saves £90 every month, or £1,080 a year, just by switching.

Other Key Benefits of VoIP

• Remote working: Staff can answer calls anywhere.
• Easy scaling: Add users in minutes.
• Integration: Works with email, CRM, and Microsoft Teams.
• Modern features: Call recording, analytics, and video meetings included.

These features give businesses more than just savings—they create efficiency.

Should You Switch Now?

If your business wants to save money and prepare for the future, VoIP is the clear winner. But before switching, check your internet speed, compare VoIP providers, and make sure you understand contract terms.

Ready to see how much your business could save? Click the link below to compare the best VoIP deals in the UK today.

FAQ

Is VoIP always cheaper than a landline?

Yes, in most cases. The only time landlines may be cheaper is in rural areas with poor internet, where VoIP may not work well.

Do I need new phones for VoIP?

Not always. You can use your computer, mobile, or buy IP desk phones.

Will landlines really be switched off in 2025?

Yes. BT has confirmed that ISDN and PSTN lines will be phased out by 2025.

Can VoIP handle many calls at once?

Yes. Unlike landlines, which are limited to the number of physical lines, VoIP can handle multiple calls over the same connection.

Is VoIP secure?

Yes, most providers use encryption to protect calls. Always choose a trusted provider.

VoIP might be cheaper—but is it better for your business? Compare both options side by side. Tap the link to find the best Business Landline rates in the UK today.