The Big Switch Off: Is Your Business Ready for 31 January 2027?

The ISDN switch off is happening in January 2027. Businesses must move over to alternative communication methods with plenty of time to avoid losing access to their phone systems.

How will the ISDN Switch-Off affect businesses?

The ISDN and PSTN switch-off means traditional landline services are being withdrawn, so businesses still using legacy phone systems will need to switch to a digital alternative such as VoIP.

Failing to upgrade could mean lost phone service, disrupted customer communications and costly downtime.

Upgrade now to stay connected, avoid disruption and benefit from a more flexible, future-ready phone system.

Contact our sales team today to find the right VoIP solution

for your business.

How do I know If I'm affected?

Check your telecoms bills or contract for terms such as:

PSTN, Analogue line, ISDN2, ISDN30, ADSL, WLR

If you’re still unsure, our sales team can review your current setup and help you understand what needs to change.

What are the Benefits of the UK ISDN Switch Off?

Stay Connected

Move away from outdated technology and ensure your business has a reliable digital phone system for the future.

Work From Anywhere

Make and receive business calls from the office, home or on the move, making remote and hybrid working easier.

Greater Flexibility

Take advantage of features such as call forwarding, call routing, voicemail-to-email and call recording.

Easier to Scale

Add new users, numbers and locations without the need for additional traditional phone lines, making it easier to grow your business.

Future-Ready Technology

VoIP offers a modern alternative to legacy phone systems, with richer features and greater flexibility than traditional ISDN services.

Reduced Costs

VoIP can reduce the cost of maintaining traditional phone lines and gives you more control over your business communications, with flexible plans that can grow with your needs.

Why switch with Global Telecom?

27 Years of Experience

With decades of experience in business telecoms, you can rely on a team that understands what businesses need.

Personal, UK-Based Support

Get support from a real UK-based team, with a dedicated point of contact who understands your business.

Reduced Costs

Lower your telecom costs with flexible digital solutions designed around your business.

We Handle the Switch

From reviewing your current setup to managing the transition, we take care of the process to minimise disruption.

Clear, Transparent Pricing

Know exactly what you're paying with clear monthly costs and no hidden fees.

Keep Your Existing Numbers

Usually, you can keep your existing numbers, making switching simple. We manage the porting process for you.

One Point of Contact

Manage your business phone systems, numbers, broadband and other telecom services through one provider, making everything easier to manage.

Solutions Built Around You

We review your current telecoms, understand how you work and recommend a solution based on what you actually need.

Concerned about the ISDN switch off? Get in touch today and our team will be in touch for advice.

With the ISDN switch off in full effect, we’re advising all business customers to move over to a fully digital service as soon as possible.

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Free Big Switch Off Guide!

Download our free Big Switch Off Guide to understand what the ISDN and PSTN switch-off means for your business, how to identify whether you’re affected, and the steps you can take to stay connected.

Click the button below to download our Guide.

Your Big Switch Off Questions Answered

What is the Big Switch Off?

The Big Switch Off is the UK-wide move away from traditional PSTN and ISDN telephone networks to modern digital communication services. Businesses using these older services will need to move to an alternative, such as VoIP.

When is the ISDN and PSTN switch-off happening?

The traditional PSTN and ISDN network is scheduled to be switched off by 31 January 2027. Businesses should start planning their move now to avoid disruption.

Will the Big Switch Off affect my business?

If your business still uses PSTN, ISDN or other traditional telephone services, you may be affected. It's also important to check whether equipment such as alarms, fax machines or payment systems relies on these services.

How do I know if my business uses ISDN or PSTN?

Check your latest telecoms bill or contract for terms such as PSTN, analogue line, ISDN2, ISDN30, ADSL or WLR. If you're unsure, Global Telecom can review your current setup and help identify whether you're affected.

What happens if I don't switch before the deadline?

If you do nothing, affected telephone lines and connected equipment could stop working after the switch-off. This could disrupt customer calls and day-to-day business operations, so it's best to make the move in advance.

What equipment could be affected by the switch-off?

It's not just traditional phone systems. Equipment that may rely on older telephone networks can include alarms, CCTV, fax machines, door entry systems, payment terminals and lift communication systems. Some equipment can be adapted, while other devices may need replacing or moving to mobile or internet connectivity.

What should I replace ISDN or PSTN with?

For business phone systems, VoIP (Voice over Internet Protocol) is a popular digital alternative. VoIP uses an internet connection to make and receive calls and can provide a range of modern features for businesses.

Can I keep my existing business phone number?

VoIP allows you to make and receive calls over an internet connection instead of traditional telephone lines. It can support features such as call forwarding, call routing, voicemail-to-email and remote working.

Can Global Telecom help me prepare for the Big Switch Off?

Yes. Global Telecom can review your current telecoms setup, identify potentially affected services and equipment, and recommend a suitable digital solution. Our Free Big Switch Off Review can help you understand exactly what you need to do before the deadline.

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