What is the PSTN Switch Off? A Comprehensive Guide for Businesses
Let’s be honest — you probably didn’t wake up today thinking about telecom networks. However, if your business still relies on a landline or equipment connected to an outdated phone socket… It’s time to pay attention.
By December 2025, the UK’s old-school phone network — the Public Switched Telephone Network, or PSTN — will be switched off for good.
What is the PSTN switch-off, you ask? Good question. Let’s get into it — no jargon, no fuss.
So, what exactly is PSTN?
Right, picture this: copper wires buried under streets, buildings, and walls — carrying your phone calls from one place to another. That’s PSTN. It’s the system we’ve used for decades — reliable, yes, but not built for the way we work today.
It’s been chugging along since the days of fax machines and pagers. And now? It’s heading into retirement.
Why is the UK switching it off?
Because it’s… well, outdated. Costly to maintain. And frankly, not great for modern communication.
The internet has moved on. Phones have moved on. But PSTN? It’s still stuck in the ’90s.
Instead, we’re moving to digital systems, such as VoIP (Voice over Internet Protocol) and full-fibre broadband. They’re quicker, cleaner, and far more flexible.
So, the PSTN switch-off in the UK isn’t just a technical upgrade. It’s a full-on digital transformation.
When is the PSTN switch-off happening?
The big switch-off is set for December 2025, but don’t be fooled — things are already in motion.
- From September 2023, no new PSTN-based lines have been sold.
- And after 2025? It’s lights out for copper.
So, if you’re wondering when the PSTN switch-off is, the answer is: soon. And you don’t want to leave it too late.
What is a PSTN used for?
Here’s the bit that surprises most people. It’s not just about phones.
The PSTN supports:
- Lift emergency phones
- Alarm systems
- Payment terminals
- Fax machines (yes, still a thing)
- Intercoms and entry systems
- Desk phones — especially older PBX setups
So, if you’re still asking, “What is a PSTN used for?” — it’s quite a list. And if your business relies on even one of those, you’ll need a plan.
What happens when PSTN is switched off?
Honestly? If you’ve done nothing… things stop working.
Calls won’t connect. Card machines might go offline. Alarms could fail. It’s not dramatic — it’s just digital evolution catching up with your systems.
And it’s avoidable — completely. But you’ve got to make the move.
That’s the answer to “What happens when PSTN is switched off?” You’re left with silence — unless you’ve already switched.
So… what now?
Here’s your action plan. Nothing scary. Just some good, old-fashioned prep work.
Step 1: Take stock
What’s connected to your phone lines? Go room to room if you must — reception, store cupboard, server room, the lot.
Step 2: Call your provider
Ask what systems are PSTN-based. If it’s PineVox, we’ll talk you through it. No jargon. No lecture.
Step 3: Switch to digital
VoIP, IP-enabled alarms, fibre broadband — whatever you need, now’s the time to line it up.
Step 4: Test and train
Give your team time to learn the new system. You don’t want surprises during the Christmas rush or the Monday school run.
Wait… what’s VoIP again?
VoIP stands for Voice over Internet Protocol. In plain English: phone calls, but via the internet, not old copper wires.
It’s not sci-fi. If you’ve used Zoom, WhatsApp, or Teams, you’ve already used VoIP.
Why VoIP makes sense:
- Keep your existing number
- Use it on mobiles, laptops, or office phones
- Crystal-clear call quality
- Easy to scale
- No engineer visits needed
PineVox specialises in setting up VoIP for UK SMEs — minus the faff.
Who needs to act?
Honestly? Most businesses. But especially those in:
- Hotels – front desks, room phones, emergency lines
- Retail – tills, payment machines, back-office phones
- Schools & colleges – admin lines, security systems
- Care homes – lift phones, intercoms, panic alarms
If you’re still on PSTN, this isn’t about upgrading. It’s about not getting left behind.
Quick checklist for SMEs
Before you close the tab, run through this:
- When is the PSTN switch-off happening?
- Have I checked which systems still rely on it?
- Have I spoken to my provider?
- Do I have a VoIP or digital plan in place?
- Have I scheduled a switch-over before 2025?
Suppose you’ve ticked all five — top marks. If not, don’t worry. That’s where we come in.
PineVox: We keep it simple
At PineVox, we help UK businesses make a smooth transition, clearly and on your terms.
No hard sell. No 20-page proposal. Just a plan that works — whether you run a café, a call centre, or a college.
Our VoIP systems are innovative, simple, and flexible. And our support? Properly British: polite, helpful, and a bit dry.
Let’s talk before the switch goes off.
Not sure where to start? Just ask.
We’ll review your setup, explain your options, and help you get ahead of the PSTN switch-off.