---
title: What Is The Big Switch Off?
description: What is the Big Switch Off? UK businesses must upgrade landline phones from copper PSTN to digital VoIP to avoid service disruption.
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# What Is The Big Switch Off?
By [**Cedar Telecom**](https://www.cedartelecom.co.uk/blog/author/cedar-telecom) on Dec 06, 2025
The way the UK communicates is changing, and the upcoming Big Switch Off is a shift every business needs to understand. For decades, traditional phone lines have carried calls, supported card machines, connected alarms and kept offices running. These older networks have served their time and are now being phased out in favour of faster, more reliable digital alternatives.
If you’ve been hearing about digital upgrades, [VoIP](https://www.cedartelecom.co.uk/voice/voip), or new phone systems and wondering what it all means, you’re not alone. Thousands of UK businesses are reviewing their communications to ensure their systems work for them. The important thing to remember is that the change is manageable, and early action puts you in a much stronger position to take full advantage of the technologies on offer.
## What Is The Big Switch Off?
The Big Switch Off is the nationwide retirement of the UK’s old Public Switched Telephone Network (PSTN) and Integrated Services Digital Network (ISDN). These are the copper-based networks that have powered landlines and many business devices for years. They’re being completely shut down and replaced with modern digital infrastructure.
All traditional analogue phone services and devices connected to these networks will no longer work. That includes standard landlines, fax machines, door entry systems, alarm lines, lifts and EPOS machines that depend on PSTN or ISDN.
## When Is The Big Switch Off Happening?
So, when is the Big Switch Off happening? The old PSTN and ISDN lines are set to be fully replaced by January 2027, but the transition is already underway.
Many regions have stopped selling old line types, and some areas have already moved into the final stages of migration. This means you may find it increasingly difficult to add new analogue lines or make changes to existing services.
While 2027 may feel a long way off, planning ahead ensures your business isn’t caught out at a busy time or forced into a rushed setup that doesn’t suit your needs.
## Why The UK Is Moving Away From PSTN And ISDN
The existing networks are decades old, and their limitations are becoming more obvious every year. Copper lines were never designed to support the bandwidth and reliability that modern businesses demand.
Digital services offer clear advantages including:
- Faster, more stable connections for voice and data
- Lower running costs with fewer physical faults
- More flexibility for remote working, multi-site teams and cloud systems
The move reflects how organisations now operate, with more cloud platforms, more online tools, and the expectation that communication should work effectively no matter where people are based.
## What The Big Switch Off Means For Your Business
If your business uses landlines, security systems, lifts, or card machines that rely on analogue connections, you’ll need to replace or upgrade them. This sounds daunting, but the transition is straightforward with the right support.
The biggest change will be how calls are made. Instead of travelling through copper phone lines, calls will be routed over your internet connection using VoIP (Voice over Internet Protocol) or a cloud-based phone system.
These digital services give you call quality that’s clearer than traditional lines, along with features that older systems generally don’t support such as call routing, mobile apps, voicemail-to-email and easy scalability when your team grows.
## Devices And Services Affected By The Big Switch Off
Common devices that will stop working unless upgraded include:
- Office landlines and desk phones running on analogue or ISDN
- Alarm systems, lift lines and door entry systems using PSTN
- Older EPOS terminals and card machines
- Fax machines and telecare devices
If any of your equipment sounds like it falls into these categories, it’s worth checking now rather than waiting until closer to 2027.
## How To Prepare For The Big Switch Off
If you want to get your business organised and future-ready, now is the time to take action. The best next step is to review what lines and devices your organisation is currently using. From there, explore digital options that suit the way your team works, whether that’s [VoIP handsets](https://www.cedartelecom.co.uk/voice/voip), softphone apps or a complete cloud-based system.
A good provider will handle the process for you, checking your site, reviewing your equipment, planning a smooth switchover, and supporting you long after installation. Clear communication, fast response times, and a personal point of contact make a big difference during a transition like this.
The Big Switch Off is one of the most significant telecoms changes the UK has seen in decades, but it doesn’t need to be stressful. The [shift to digital phone services](https://www.cedartelecom.co.uk/is-voip-reliable-for-business) is an opportunity to modernise, streamline and strengthen your communications. With clear advice and the right setup, your business can make the move confidently, long before the deadline arrives.[Please contact a member of our team](https://www.cedartelecom.co.uk/contact) to discuss your business’ needs and find out about how we can help your business transition.
Image Source: [Canva](https://www.canva.com/photos/MAGqugFuMh4-finger-pushing-illuminated-red-button)
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