BT's Big Switch-Off: What UK Small Businesses Need to Do Before the Landline Ends

There's a big change happening to the UK's phone network, and a surprising number of small business owners still haven't been told about it properly. The traditional analogue landline — the copper wire that runs from the telegraph pole, through the junction box on the wall, to the phone on the desk — is going away. Not upgraded. Not modernised. Switched off entirely.

If you're a plumber, an electrician, a letting agent, a salon owner, a small solicitor's office, a village shop — or any of the hundreds of thousands of UK businesses still using a traditional BT business line — this affects you directly. And if you do nothing, at some point over the next few months your line will simply stop working.

The good news is that the fix is straightforward, cheaper than what you're probably paying now, and doesn't involve rewiring anything or buying a pile of new equipment. This guide walks through exactly what's happening, what you need to do about it, and how to get through the transition without losing a single call or a single customer.

What the PSTN Switch-Off Actually Is

PSTN stands for Public Switched Telephone Network. It's the copper-wire phone system that has powered UK landlines since the early 20th century. It's the infrastructure sitting behind every traditional business line, every home phone with a dial tone, and every piece of equipment that relies on sending an electrical signal down a pair of twisted copper wires. It is, bluntly, old. Much of it is over fifty years old, and some of the equipment Openreach engineers still maintain was installed before most of us were born.

The switch-off is the industry-wide programme to retire that entire network and replace it with digital voice services — phone calls delivered over the internet, rather than over dedicated copper lines. It's not a BT thing, even though BT gets most of the headlines. Every UK telecoms provider is migrating their customers off PSTN, because the national infrastructure itself is being decommissioned. Once it's gone, there is no copper line left to use.

The replacement technology is broadly called "Digital Voice" or IP-based telephony. In practice it means phone calls are carried as data packets over a broadband connection, exactly like a video call or a streamed song, rather than as analogue electrical signals over a dedicated wire. It's cheaper, it's more flexible, and it enables features that the old network was never designed for — but it does mean every business still on the old system has to make a move.

Who's Affected — And Who Isn't

The short version: if your phone plugs into a wall socket that has a BT master socket behind it, and you get a dial tone when you pick it up without needing a router or any other equipment powered on, you're on PSTN and you're affected.

That covers the vast majority of small business landlines in the UK. It includes traditional BT business lines, single analogue lines, multi-line business systems (ISDN is a related technology also being switched off), and countless pieces of equipment sitting quietly in the background that most business owners have forgotten even exist.

If you're already using a cloud-based phone system, a VoIP provider, or a mobile-only setup, you're not directly affected by the switch-off itself — the network your calls travel over doesn't need to change. But it's still worth checking anything auxiliary that might be quietly plugged into a phone line somewhere in the building.

The Timeline and What Happens If You Ignore It

The switch-off isn't a single cliff-edge on one specific day — it's a rolling programme. Openreach and individual service providers are migrating exchanges and customers in waves across 2026, with the national network retirement completing by 31 January 2027. Different parts of the country are being done at different times, and your specific switch-off date depends on which exchange serves your area and which provider you're with.

In practice, most business customers should receive direct notification from their provider several months in advance of their line being affected. That notification is your warning — it's the moment to start acting, not to file the letter in a drawer.

If you do nothing and your switch-off date arrives, the practical result is straightforward: your dial tone goes away, incoming calls to your number fail with a disconnected tone, and any equipment on the line stops functioning. Worse, if the line is formally ceased and a meaningful period passes before you try to rescue the number, porting it to a new provider becomes significantly harder — and in some cases impossible. Numbers that have been ceased and released back into the pool can't always be recovered.

The nightmare scenario is the business that has printed a phone number on vans, shop fronts, business cards, Google listings, and ten years of marketing collateral, and then loses it because nobody acted on the letter from the provider. That number is often worth more than the line itself — and once it's gone, it's gone.

Your Four Realistic Options

When the switch-off notice arrives, most businesses have four practical paths they can take. Each has trade-offs, and the right one depends on your setup, your budget, and how much you value simplicity.

Option 1: Stay with BT and take their Digital Voice service

BT will happily move you onto Digital Voice, which is their IP-based replacement. Your existing handset can often be plugged into a converter, or you'll be issued a new one that connects to your router. It keeps everything familiar, but it's usually the most expensive option, tied to BT's broadband, and you gain relatively few features for the money.

Option 2: Move to a traditional VoIP provider

There's a whole industry of cloud PBX and hosted VoIP providers — the sort that sell feature-rich systems aimed at mid-sized businesses with an office full of desks. They work well, but they typically require desk phones, a properly configured network, sometimes a consultant to set it up, and ongoing per-user fees that add up quickly for a small team.

Option 3: Go mobile-only and abandon the landline altogether

Just tell customers the new number is your mobile. Cheap, simple, and terrible for your business. Mobile numbers on marketing materials look unprofessional, customers subconsciously assume you're a one-person outfit, and you lose the trust signal that a local landline provides. You also lose your existing number, which is often a hidden but significant cost in lost recognition.

Option 4: Move your business number to a mobile-based digital phone system

This is the option most small businesses don't realise exists: keep your existing landline number, move it to a cloud-based provider, and have it ring straight through to an app on the mobile phones you already own. No new hardware, no desk phones, no network configuration. Your business number travels with you, and all the clever stuff — voicemail, forwarding, out-of-hours handling, transcription, an AI receptionist — is handled in the cloud.

This is exactly what Team-Connect was built for, and it's the option we'll spend the rest of this guide on, because it's genuinely the simplest and cheapest route for the majority of small businesses in the UK.

Why Most VoIP Providers Don't Solve the Real Problem

There's a temptation, when the switch-off notice arrives, to simply Google "business VoIP" and pick one. That can work, but it often ends up solving the wrong problem. Most traditional VoIP products are designed for businesses with a physical office, desk phones, multiple simultaneous lines, and an IT person to look after it all. Small businesses — the sole trader, the two-person partnership, the shop, the mobile trades business — don't have any of that, and don't need any of it.

What they actually need is the phone number itself to keep working, on whatever device happens to be in their hand when it rings. A plumber doesn't want to answer the phone on a desk handset — he wants it in his pocket while he's under a sink. A salon owner wants it to ring on the same iPhone she uses for everything else, not on a separate piece of hardware that lives by the till.

The Team-Connect Approach: Your Number, Your Mobile, Zero Hardware

Team-Connect exists specifically for the kind of business that needs a proper business phone presence but doesn't want the overhead of a traditional phone system. The concept is simple: your business landline number lives in the cloud, and it rings on an app on your existing mobile phone. Outbound calls made through the app show your business number to the person you're calling, so nobody ever sees your personal mobile.

When a call comes in, you can answer it yourself, let your AI receptionist take it, forward it to a colleague, or have it go straight to voicemail — and the rules for all of that are yours to set. The AI receptionist isn't a bolt-on either. It's included on every plan, it answers calls in a voice that's genuinely hard to distinguish from a human, it knows about your business because it's connected directly to your account, and it can take messages, book appointments, answer common questions, and forward urgent calls through to you in real time.

For a business currently paying £30 to £45 a month for a BT line that sits on the desk and gets ignored half the time, this is generally a significant step up in capability and a significant cut in cost.

Keeping Your Existing Number (Number Porting)

The single most important thing to understand about the switch-off is this: you do not have to lose your existing business number. You can port it — the industry term for transferring it between providers — to Team-Connect (or any other compliant provider) and it's yours to keep indefinitely afterwards. Geographic numbers (01, 02), non-geographic numbers (03), and most 0800 numbers are all portable.

The process is straightforward. You sign up with the new provider, give them the details of your existing line, sign a porting authorisation form, and the two providers coordinate the transfer. Your existing line keeps working throughout — calls come in normally right up until the moment the port completes, at which point they seamlessly start ringing on your new system. There's no downtime if it's done correctly.

Porting typically takes between 5 and 15 working days, depending on which provider you're coming from. The critical point — and this is the bit most people get wrong — is that you need to start the port before your line is switched off, not after. Porting an active line is simple. Porting a dead number from a ceased account is a headache at best and impossible at worst.

What It Costs Compared to Your Current BT Line

Most UK small businesses on a traditional BT Business line are paying somewhere between £25 and £45 per month for the line itself, with call charges on top. Add voicemail, call diversion, or any of the "premium" features, and many businesses end up in the £50+ bracket before they've made a single outbound call. There's also usually a line rental component that has nothing to do with the phone service itself — it's the cost of the physical copper pair.

A like-for-like comparison with Team-Connect looks something like this:

For a typical single-user small business, the switch will usually save around £300 to £500 over the course of a year, while simultaneously adding capabilities — particularly the AI receptionist — that simply aren't available at that price point from traditional providers.

The Migration Checklist

If you're ready to get on with it, here's the practical running order. Most small businesses can work through this list in a single afternoon.

1. Find your switch-off date. Check any recent letters from your current provider, or call them and ask. Knowing the date means you can plan properly rather than rush later.
2. Make a list of everything that depends on the line. Not just the phone itself — alarms, card readers, intercoms, fax machines, anything plugged into a phone socket. Each one will need its own plan.
3. Sign up for Team-Connect. You can do this in a couple of minutes from your mobile. Choose a plan, pick a new number if you want one, and the service is live immediately.
4. Submit a port request for your existing number. If you want to keep your current business number, this step starts the transfer. Do it well before your switch-off date.
5. Set up your AI receptionist. Configure your business hours, greeting, and how you want calls handled when you can't answer. This takes five minutes and pays for itself the first time a call comes in out of hours.
6. Update your marketing and contact points. If you're keeping the same number, there's nothing to update. If you're taking a new one, update Google Business, your website, signage, and vans.
7. Plan replacements for any non-phone equipment. Alarm monitoring, payment terminals, and lift phones need dedicated digital alternatives — your alarm installer and card processor can usually sort these directly.
8. Wait for the port to complete. Your old line keeps working. On the port date, calls to your number start ringing on Team-Connect automatically.
9. Cancel the old line once the port has completed successfully. Not before. Early cancellation is one of the most common ways businesses accidentally lose their numbers.

The Other Things on Your Line You've Probably Forgotten

This is the bit of the switch-off that catches people out, and it's worth spending a paragraph on even if the rest of this guide has been about phones. Because PSTN was the dial-tone standard for so long, all sorts of equipment was designed to piggyback on it. Moving your phone service over is step one — but there may be other gear that also needs attention.

Alarm systems are the big one. Many intruder and fire alarm panels installed before roughly 2015 were designed to dial an alarm receiving centre over a standard phone line when triggered. When the line goes away, the alarm can no longer call for help. Your alarm company can usually upgrade you to an IP or mobile signalling module — this is a separate conversation with them, and shouldn't be skipped, because an unmonitored alarm is sometimes worse than no alarm at all.

Card payment terminals are the next most common issue, especially in pubs, shops, and older hospitality venues. Modern terminals use the internet or mobile networks directly, but older phone-line terminals will stop working on switch-off day. Your acquiring bank or card processor can swap you to a newer model, usually at no cost.

Door entry intercoms, lift phones, and other safety-critical devices each have their own specialist replacements. None of this is complicated individually, but it does need thinking about — get your phone migration sorted first, then work through the rest of the list methodically.

Frequently Asked Questions

When is the BT landline switch-off happening?

The UK PSTN switch-off is being delivered across 2026 and 2027, with different exchanges being migrated on a rolling basis. The national programme is due to complete by 31 January 2027, after which the traditional copper-based phone service will no longer exist. Your specific date depends on your exchange and your current provider, who should notify you directly several months in advance.

What is the PSTN switch-off and why is it happening?

PSTN stands for Public Switched Telephone Network — the analogue copper-wire phone system that has powered UK landlines for decades. It's being retired because the hardware is ageing, expensive to maintain, and no longer fit for purpose. It's being replaced with digital voice services delivered over the internet, which are cheaper, more reliable, and vastly more flexible.

Will I lose my business phone number when my landline is switched off?

Not if you act before your line is ceased. Your existing number can be ported (transferred) to a new digital provider such as Team-Connect, and once it's ported it's yours to keep permanently. The key is to start the port well before your old provider terminates the line — porting a number that has already been disconnected is significantly harder, and sometimes impossible.

Do I need to buy new phone handsets or hardware?

Not with Team-Connect. Your business number runs through an app on the mobile phone and computer you already own, so you can migrate at zero equipment cost. Some other VoIP providers require you to buy desk phones or network equipment, which can add hundreds of pounds to the migration.

What happens if I do nothing before my line is switched off?

Your landline will simply stop working on the date your exchange is migrated. Calls will fail, any equipment depending on the line will stop functioning, and in many cases your number will eventually be released back into the pool. Moving before your switch-off date is the only way to keep your number and avoid any downtime.

Is Team-Connect cheaper than a BT business line?

In almost every case, yes. A typical BT business line costs around £25 to £45 per month before call charges, and often adds further fees for features like voicemail or diversion. Team-Connect starts at £9.99 per month and includes unlimited UK calls, voicemail transcription, call forwarding, and a 24/7 AI receptionist as standard. For most small businesses, the switch represents a saving of several hundred pounds per year.

How long does it take to migrate from BT to Team-Connect?

Setting up a new Team-Connect number takes about two minutes. If you want to keep your existing business number, the porting process typically takes 5 to 15 working days, during which your old line keeps working normally. Once the port completes, calls switch across automatically with zero downtime.

What about my burglar alarm, card terminal, and other equipment on the line?

Each of those should be reviewed separately. Alarm companies, card processors, and intercom installers all have digital alternatives for equipment that currently uses the PSTN. Get your phone service migrated first, then work through the rest of the list with the relevant suppliers.

The Bottom Line

The switch-off is happening whether small businesses are ready for it or not. Doing nothing isn't a strategy — it's just a delayed problem with worse options attached. But once you understand it, the actual migration is less scary than the letter from BT makes it sound. Pick a digital provider, port your number, set up call handling, and deal with the auxiliary equipment separately. You'll very likely end up with a better phone system than the one you had, for less money, with more features, and without a length of ageing copper wire in the equation.

Team-Connect exists specifically to make this transition simple for the kind of businesses that can't afford to get it wrong — the sole traders, the small partnerships, the local trades firms, the shops, the salons. If that sounds like your business, you can sign up today in about two minutes, port your existing number across, and be on the other side of the switch-off without ever missing a call.