WLR Switch-Off: What UK Businesses Need to Do Before January 2027

The UK’s traditional phone network is being switched off. By 31^st January 2027, the Wholesale Line Rental (WLR) network will be retired for good and anything relying on it will stop working.

At first glance, that sounds straightforward. But in reality, it’s catching more businesses out than expected.

We’re speaking to organisations who are confident they’ve already moved away from analogue lines, only to discover there are still a few quietly running in the background. Often installed years ago, frequently forgotten about, but still very much connected.

Lift emergency phones, alarm systems, backup lines added 'just in case’… even the occasional fax machine of a bygone era will catch people out.

Individually, they don’t seem like a big deal but when the switch-off happens, each service will be affected — all at the same time.

So, the real challenge isn’t simply replacing your phone system; it’s uncovering everything else that might still depend on the traditional phone network.

What is the WLR switch-off?

The Public Switched Telephone Network (PSTN) is the UK’s legacy analogue phone network and makes up part of the overall WLR service. In other words, it refers to all that copper cabling that’s been running UK telecoms for over a century. To better cope with the way that businesses operate and communicate today, WLR is being retired and replaced with more reliable and flexible digital connectivity. Anything still relying on these traditional phone lines will need to move to an IP-technology solution before January 2027.

For some organisations, that’s a simple change. For others, it’s more about visibility; understanding what’s actually connected before making any decisions.

The switch-off timeline (and why it matters)

The January 2027 deadline might sound a long way off, but the key milestones happen much sooner.

• From April 2026, wholesale pricing for WLR services is expected to increase significantly. So, if you’re still running analogue lines, you may start to see costs creep up for infrastructure that’s already being phased out.
• Later in 2026, demand for migrations is likely to ramp up. As more organisations move at the same time, engineer availability tightens and lead times get longer.
• By 31^st January 2027, PSTN and other WLR services are withdrawn completely. Any remaining analogue lines will no longer function.

Planning early simply gives you more control over timing, cost, and how the transition happens.

The lines businesses often forget about

This is where things get interesting. Even businesses that have already moved to hosted telephony are often surprised by what’s still connected to PSTN.

These lines usually sit outside of IT ownership, which makes them easy to miss. They’re installed by lift engineers, alarm providers, and facilities teams - sometimes years apart - and rarely reviewed again.

We regularly come across things like:

• Lift emergency phones installed separately from your main phone system
• Building alarm systems still running on analogue connectivity
• Door entry systems and intercoms that haven’t been reviewed in years
• Legacy backup lines originally added for resilience
• Fax machines still connected to copper lines
• Card payment terminals with dial-up failover
• Older EPOS, monitoring or telemetry systems using analogue connections

They don’t always appear on your main telecoms bill and sometimes no one internally even knows they’re still there. But, if they rely on WLR service, they’ll all be affected by the January 2027 switch-off.

What happens if you leave it too late?

Leaving things until the last minute doesn’t automatically mean disaster but it does make life harder.

Legacy services are already becoming more expensive and support is gradually being reduced. As the deadline approaches, demand for migrations increases, availability becomes more limited, and projects take longer to schedule.

For some businesses, the biggest risk is operational. Customer lines could stop working, emergency systems may no longer be compliant, and services you rely on every day might suddenly need urgent attention.

Starting earlier helps to avoid the pressure and gives you time to make considered decisions.

Your PSTN replacement options

The good news is that the alternatives aren’t just replacements; they’re often an improvement on the old system.

Hosted telephony moves your phone system into the cloud, which means that calls can be handled from desk phones, laptops or mobiles, making hybrid working easier. Management is simpler, hardware requirements are reduced, and features like voicemail-to-email and reporting come as standard.

SIP trunking is another option. This allows you to keep your existing phone system while replacing analogue connectivity with IP-based services. It can be a good fit where current infrastructure is still supported and working well.

In some cases, a mix of both approaches works best — migrating certain services now, while planning longer-term changes separately.

How to prepare for the WLR switch-off

The first step is understanding what you actually have in place. A quick review often highlights lines or services that haven’t been looked at in years.

From there, you can decide what still needs to stay, what can be consolidated, and what should be migrated, making the process far more manageable. Starting early also means you can move at your own pace, rather than competing for availability closer to the deadline.

Why acting early helps

Businesses that start planning now typically avoid rising costs, reduce the risk of disruption, and end up with a more flexible communications setup.

The WLR switch-off is more than just a technical change — it’s also a chance to simplify and modernise at the same time.

WLR Switch-Off: FAQs