PSTN Switch-Off Checklist 2026: Is Your Business Ready?

Remember when everyone said the fax machine was dead? Well, this time it’s actually happening. The PSTN switch-off in the UK isn’t a rumour or a distant threat anymore. It’s real, it’s scheduled, and if your business is still running on copper telephone lines, you’ve got about 12 months to sort it out.

By January 2027, BT Openreach will have completed the biggest overhaul to British telecoms since, well, since Alexander Graham Bell had his eureka moment. Traditional phone lines are being switched off completely. No more copper. No more ISDN. Just digital.

And if you’re thinking “I’ll deal with it later,” you’re not alone. But you are cutting it fine.

Time’s Running Out Faster Than You Think

Here’s what most business owners don’t realise: this isn’t like upgrading your laptop when it starts running slowly. You can’t just pop into Currys on a Saturday morning and pick up a replacement.

The PSTN switch-off affects every single phone line in the country. That desk phone in reception? Done. The fax machine in accounts? Toast. Even that rarely-used phone in the supply cupboard? Yep, that too.

BT stopped selling new PSTN and ISDN connections back in September 2023. They’re not being difficult. They’re preparing the infrastructure. The copper network is ancient, expensive to maintain, and frankly knackered. It’s being replaced with digital alternatives like VoIP systems.

But here’s the kicker: millions of UK businesses are in exactly the same boat. They’re all going to need new phone systems. And they’re all going to want them installed before the deadline.

You can probably see where this is going.

What Could Actually Go Wrong

Let’s paint a picture. It’s December 2026. You’ve been meaning to sort out your phones for months, but Christmas orders are mental, half the staff are off with flu, and honestly, you just forgot.

Then one morning in January 2027, your phones go silent.

No dial tone. No incoming calls. Your customers can’t reach you. Your suppliers can’t reach you. That big client who was about to sign a massive contract? They’ve just called your competitor instead because, well, you literally weren’t answering.

Dramatic? Maybe. Unlikely? Absolutely not.

Here’s what happens if you leave it too late:

You’ll be competing for installers with everyone else. Good luck getting a slot before spring 2027. And if you do find someone available, expect to pay through the nose for the privilege.

Your phone numbers might not transfer in time. Porting numbers to a new VoIP telephone service takes 10-15 working days minimum. Miss the window, and you could lose the numbers you’ve been using for years.

Emergency workarounds are expensive and rubbish. Routing everything through mobile phones? Nightmare. Trying to manage a business on WhatsApp? Unprofessional. Temporary solutions that were meant to last a week? Still there six months later.

Your reputation takes a battering. Try explaining to your best customer why they couldn’t get hold of you when they needed you most. “We forgot to upgrade our phones” doesn’t exactly scream competence.

The deadline isn’t flexible. This isn’t the sort of thing where BT will give you an extra fortnight if you ask nicely. When January 2027 arrives, the copper network switches off. End of story.

Your Seven-Step PSTN Survival Guide

Right. Enough doom and gloom. The good news is that sorting this out is entirely doable. You just need a plan and enough time to execute it properly.

Here’s your practical checklist:

1. Work Out What You’ve Actually Got

First things first: figure out what phone system you’re currently using. If you’ve got those chunky desk phones with buttons everywhere, or your phone bill mentions PSTN, ISDN, or analogue lines, then yes, you’re affected.

Don’t know? Check with your IT person. Still unsure? Grab your phone bill. If it says anything about copper lines or traditional telephony, that’s your answer.

2. Understand Your VoIP Options

VoIP (Voice over Internet Protocol) is the replacement everyone’s moving to. Instead of sending your voice down copper wires, it sends it down your internet connection as data. Same as a Zoom call, basically, but for your business phone system.

The advantages are genuinely impressive:

• Your team can take calls from anywhere with decent WiFi
• Add new users in minutes, not weeks
• Plug into your existing software (CRM, Microsoft Teams, email)
• Usually costs less than your current setup
• Better call quality than those crackly old landlines

Business phone systems UK are almost all VoIP-based now. It’s not experimental technology anymore. It’s just normal.

3. Check Your Internet Is Up to Scratch

Here’s the thing about VoIP: it needs a stable internet connection. Not necessarily super-fast, but reliable.

You’ll need roughly 1 Mbps of upload and download speed for each person on a call simultaneously. So if you’ve got ten staff who might all be on the phone at once, aim for 10 Mbps minimum.

Run a quick speed test. If your internet’s a bit ropey, now’s the time to sort it. Most VoIP systems work better on wired connections anyway, so it’s worth checking your network setup.

4. Pick a Provider Who Won’t Disappear on You

This is where people often go wrong. They Google “cheap VoIP,” pick whoever comes up first, and then spend the next year regretting it.

Look for a provider who:

• Actually answers their phone (ironic, but you’d be surprised)
• Offers UK-based support, ideally around the clock
• Has transparent pricing with no sneaky hidden charges
• Will help transfer your existing numbers
• Provides proper training for your team
• Has a decent track record with businesses like yours

PineVox has been doing this for over two decades. We don’t just flog you a VoIP system and vanish. We make sure everything’s working, your team knows how to use it, and you’ve got someone to ring if things go sideways at 3pm on a Friday.

5. Get Your Migration Timing Right

Do not, under any circumstances, leave this until Christmas 2026.

A proper migration to a VoIP telephone service takes between four and eight weeks. That includes choosing your system, porting your numbers, installing everything, testing it properly, and training everyone.

Then add a couple of weeks for the inevitable “we didn’t think about that” moments, and you’re looking at starting this process by summer 2026 at the absolute latest.

But honestly? Why wait? The sooner you switch, the sooner you’ll be wondering why you put up with those old phones for so long.

6. Remember the Odd Bits and Bobs

A few things people often forget about:

• Fax machines: Some industries still use them. They’ll need an adapter to work with VoIP.
• Alarm systems: If your security alarm dials out over a phone line, check it’s compatible with VoIP.
• Card payment terminals: Older PDQ machines sometimes use phone lines.
• Door entry systems: Same issue.

Sort these out before migration day and you’ll save yourself a massive headache.

7. Make Sure Everyone Knows How to Use It

The fanciest VoIP system in the world is pointless if nobody can work it.

Your team needs to know:

• How to make and transfer calls (every system’s slightly different)
• Setting up voicemail and call forwarding
• Using any mobile apps or desktop software
• Accessing features like call recording or conferencing
• Who to contact when something inevitably goes wrong

A decent provider includes training as standard. If yours doesn’t, that tells you something.

Why Sorting This Out Now Actually Saves You Money

Here’s the funny thing about procrastination: it’s almost always more expensive than just getting on with it.

Switch now and you’ll pay normal rates, get your preferred installation date, and have months to iron out any wrinkles before everyone else panics.

Wait until late 2026 and you’ll be fighting thousands of other businesses for the same installers, probably paying rush fees, and dealing with all the stress of a last-minute bodge job.

Plus, VoIP systems usually cost less per month than traditional lines anyway. Every month you delay is potentially money wasted.

Let’s Talk Phones

Look, we’re not going to pretend that changing your phone system is exciting. It’s not up there with launching a new product or hiring brilliant people.

But it does need doing. And it needs doing properly.

At PineVox, we’ve helped hundreds of UK businesses navigate the PSTN switch-off. Schools, hotels, estate agents, manufacturers, you name it. We know what works, what doesn’t, and how to make the whole thing as painless as possible.

Wondering if your business is ready? Need help figuring out what you actually need? Or just fancy a straightforward conversation about your options without the hard sell?

Let’s get your phones sorted before the deadline turns into a crisis. Because you’ve got enough on your plate without your phone system packing in.