The analogue phone network switches off on 31 January 2027. That is a national deadline, but what it means for you is entirely local: which lines are in your building, what equipment is quietly sitting on them, and how busy the engineers are when you finally pick up the phone. Here is the Liverpool version, and the bits that catch local businesses out.
The short version
- 31 January 2027 is the deadline for analogue and ISDN lines.
- It is not just the phones. Lifts, alarms, card machines and door entry all sit on those lines.
- Your 0151 number is safe, provided it is ported rather than cancelled.
- Older Liverpool buildings are the hard cases, because of what is already in the risers.
- The queue is the real risk. Everyone leaving it late wants the same engineers.
On this page
What is actually ending
The public switched telephone network, the copper-based system that has carried analogue phone calls for decades, is being retired. ISDN goes with it. After the switch off, services that depend on a traditional phone line stop working.
What replaces it is voice carried over a broadband connection. For most businesses that is an improvement rather than a loss: numbers stop being tied to buildings, calls can reach mobiles and laptops, and the system is software rather than a box on a wall. But it is a change that has to be made rather than one that happens to you.
Our national PSTN switch off guide covers the technical detail. This piece is about what we actually find in Liverpool premises.
The part that is not the phones
Businesses plan for the phones. It is everything else on those lines that causes the trouble, because nobody has a list of it.
- Lift emergency lines. Safety critical, usually on a maintenance contract with someone else, and frequently nobody is certain who owns the connectivity. Establish that early.
- Alarm and fire panels. Intruder, fire and monitored systems that dial out over an analogue line.
- Door entry and gates. Particularly on converted buildings and multi-tenant sites.
- Card machines. Older terminals on a dedicated line, common in hospitality.
- Fax and franking, still in use in professional practices more often than people admit.
The question that finds all of it: does anything in this building plug into a phone socket other than a telephone? Ask it of whoever has been there longest. It routinely uncovers two or three things nobody had thought about, and in older buildings it uncovers more.
Liverpool buildings and why they complicate it
A lot of the commercial stock here is converted: warehouses, Victorian offices, upper floors above retail, mills and mission buildings turned into studios. That changes the job in three ways.
- The cabling rarely matches the floorplan. Lines were added over decades by different people for different tenants. What is marked on a socket is not reliable evidence of what it does.
- The riser belongs to the landlord. In multi-tenant buildings, getting a new broadband service from the entry point to your floor needs permission and sometimes a formal wayleave. Our post on risers, landlords and lead times covers how that plays out.
- Fibre availability is uneven street by street. Two buildings on the same road can have genuinely different options, which is why an availability check on the exact address matters more here than the postcode.
None of that is a reason to delay. It is a reason to start the survey earlier than you would in a modern unit on an industrial estate.
Your 0151 number
The most common worry, and the easiest to settle: you keep it. Numbers are ported to the new service rather than replaced.
The one way to lose it is to let the old line be cancelled before the port is agreed. Ceasing a number sends it back into the pool and recovery is difficult. The correct order is always: agree the new service, port the number, confirm calls are arriving, then cease the old lines.
Our post on keeping your 0151 number goes through the awkward cases, including lines registered to a landlord or a previous occupier.
The queue nobody plans for
This is the practical risk, and it is the one worth acting on.
The deadline is fixed and national. Every business that leaves it until the last few months will be looking for the same engineers, the same survey slots and the same install dates, at the same time. In a city with a lot of older and multi-tenant buildings, where jobs take longer and more of them need landlord permission, that queue will bite harder.
Businesses that move early get to treat it as an upgrade, choose their date and specify what they actually want. Businesses that move late get whatever is available.
What to do now
- List every line into the building, and what is on each one. Include the ones belonging to third party maintainers.
- Identify the safety critical ones first. Lifts and alarms have longer lead times and more parties involved.
- Check what broadband the address can actually get. Not the postcode, the address.
- If you are in a shared building, talk to the landlord early about the riser and any wayleave.
- Confirm your numbers are portable and whose name the lines are in.
- Book it. The date you want is available now and will not be in late 2026.
We will survey the building with you
We will work out what is on every line, what has to change, what it will cost and how long it takes. If you are in a converted or shared building in Liverpool, that survey is worth doing sooner rather than later, because those are the jobs with the longest tails.