Almost every UK business has used one, yet very few people could tell you exactly what a business landline is or how it actually works. With the old phone network being switched off on 31 January 2027, it is worth understanding what you have got - because the answer affects your costs, your numbers and your options.
What a business landline actually is
A landline is a telephone connection fixed to a physical address rather than carried on a mobile network. When you pick up a desk phone and hear a dial tone, that tone has traditionally come down a pair of copper wires running from your building back to your local telephone exchange.
A business landline is the same idea, provided under a business contract. The line itself is not physically different from a residential one - what changes is the wrapper around it: business-grade support, clearer service levels, VAT invoicing, and the ability to add multiple lines, a phone system and features like call divert or hunt groups.
The three things people call "a line"
People use "landline" loosely, and it causes real confusion when comparing quotes. A business phone setup is actually made of three separable parts:
- The physical connection - the copper (or now fibre) running into your building.
- The line rental - the ongoing standing charge for keeping that connection active, regardless of whether you make any calls. See business line rental explained.
- The number - the geographic phone number (an 0161, 020 or 0114, say) that customers dial. Numbers can be moved between providers, as we cover in keeping your business landline number.
This matters because the switch-off affects them differently. The connection technology changes, the line rental disappears entirely, and the number is unaffected. Once you see it that way, the whole transition becomes much less alarming: you are not losing your phone number, you are changing how it is delivered.
Types of business landline
Most UK businesses fall into one of these camps:
| Type | What it looks like | Typical user |
|---|---|---|
| Single analogue line (PSTN) | One line, one number, a basic handset | Very small businesses, shops, back-office lines |
| Multiple analogue lines | Several individual lines, often with one advertised number that "hunts" to the next free line | Small offices, practices |
| ISDN2 | Digital lines in pairs of channels | Smaller offices with a phone system |
| ISDN30 | Larger blocks of channels, typically 8 to 30 | Bigger phone systems, contact-heavy businesses |
| Lines with DDI | A block of numbers so individuals or departments each have a direct number | Any business where staff need their own number |
Each "channel" is one simultaneous call, which is the number that actually determines your capacity - see multi-line phone systems and channels. If you are on ISDN, ISDN replacement for business covers what happens next, and Direct Dial-In explains DDI ranges.
How to work out what you have
Most people genuinely do not know, and it takes about twenty minutes to find out. Three sources of evidence:
Your bill. Look for the standing charges rather than the call charges. Terms like line rental, WLR, analogue line, ISDN2, ISDN30 or channels tell you the product. Count the lines listed and compare that with the number of phones you can actually see - a mismatch is extremely common and usually means you are paying for something unused.
The physical evidence. Walk the building. Note every phone socket, what is plugged into it, and anything with a phone cable running to it that is not a phone - an alarm panel, a card terminal, a lift machine room, a door entry box, a fax machine. This is the step people skip and then regret, because those devices need their own migration plan. See devices that rely on phone lines.
A simple test. Try making two calls at once from different handsets. If the second one fails, you have one line or one channel. It sounds crude; it is often the fastest answer.
Write the results down as a list of lines, with what each one does and what it costs. That list is the foundation of every decision that follows, and it is the single most useful hour you can spend on this.
Business landline vs home landline
The wires are the same, but the service differs in ways that matter:
| Home line | Business line | |
|---|---|---|
| Support priority | Standard | Faster, business hours and beyond |
| Fault fix targets | Best effort | Often backed by an SLA |
| Billing | Personal | VAT invoice, itemised |
| Extra lines and numbers | Limited | Multiple lines, DDI ranges, hunt groups |
| Features | Basic | Call divert, recording, analytics via a system |
| Contract | Consumer rights, short terms | Business terms, usually longer |
| Acceptable use | Domestic use | Commercial use permitted |
That last row is worth noting. Running a business on a residential line is generally outside the provider's terms, and it also means no SLA on faults - which is fine until the day the line fails and you discover your fix target is "when we get to it".
For a deeper look at the features you can layer on, see landline calling features explained.
What a business landline costs
Traditional analogue business line rental has typically sat in the region of £15-£25 per line per month as a guide, with calls charged per minute unless you bought a bundle. Two things have changed that picture in 2026: legacy wholesale line rental has risen in stages through the year - roughly doubling - and the digital replacements are priced per user with inclusive UK calls rather than per copper line.
The practical consequence is that the old product is now the expensive one. Our business phone line cost guide breaks down the components, and the WLR price rises covers the increases.
Why landlines are changing
Here is the important part. The traditional analogue network - the PSTN - is being retired. Openreach switches it off on 31 January 2027, and you have not been able to order a brand-new analogue line anywhere in the UK since the national stop-sell in September 2023. See our Openreach stop-sell guide for what that blocks, and the switch-off deadline guide for the timeline.
That does not mean the end of the landline - it means the landline becomes digital. Your fixed business number now runs over an internet connection instead of copper, whether that is a simple Digital Voice line that plugs into a router, or a full hosted telephony system. You can compare all the routes in business landline alternatives.
If you would like someone to look at your current lines and tell you what they are and what they should be replaced with, get a no-obligation quote - we will start with the audit rather than the sales pitch.
What "a business landline" means from 2027
Worth being clear about, because the language is going to lag the technology for years. When someone says "business landline" after the switch-off, they will mean a fixed business phone number with proper call handling - which is what people actually valued about a landline all along. What changes:
- No copper, no line rental. You buy connectivity and a voice service instead.
- The number stays. Geographic numbers keep working and keep their area code.
- Features improve. Voicemail-to-email, call routing and reporting come as standard rather than as paid extras.
- Power becomes your responsibility. Copper carried its own power from the exchange; a router does not. This needs a deliberate plan - see landline resilience and failover.
- It stops being tied to the building. The same number can ring a desk phone, a laptop or a mobile.
The one genuine loss is the power independence. Everything else is an improvement, and the power question is solved with battery backup on the router and automatic diversion of calls to mobiles.
Do you still need one?
For most businesses, yes - though what you need is the fixed number and the call handling rather than the copper. A geographic number signals a real business with real premises, keeps work calls off personal mobiles, and lets more than one person answer. We look at the honest exceptions in do businesses still need a landline.
The bottom line
A business landline is simply a fixed phone connection and number for your business - but the technology underneath it is moving from copper to digital, on a fixed date. If you understand the line, the rental and the number as three separate things, the switch is far easier to navigate: two of them change and the important one does not.
Want to know exactly what you have and what it should become? Get a no-obligation quote or call 0333 006 9399, and we will audit your lines first.
Getting unknown calls on a business line? Our free UK phone number checker shows which network or provider Ofcom allocated any number to, and whether the range is in service — no sign-up.
Frequently asked questions
What is a business landline?
A business landline is a fixed telephone line and number at your business premises, provided under a business contract with business-grade support, VAT billing and the ability to add lines, direct-dial numbers and phone-system features. Traditionally it ran over copper wires; new lines are digital, carried over an internet connection.
Is a business landline different from a home phone line?
The underlying connection has historically been the same, but the service differs: faster support, clearer fault-fix targets backed by an SLA, VAT invoicing, and support for multiple lines and DDI ranges. Running a business on a residential line is also generally outside the provider's terms, and leaves you without any service level on faults.
Are business landlines being phased out?
The copper network behind traditional landlines is switched off on 31 January 2027. Fixed business numbers are not being phased out - they carry on, delivered digitally over an internet connection rather than over analogue copper. In practice the term "landline" survives; only the technology underneath it changes.
Can I still get a new business phone line?
Yes, but it will be a digital line rather than an analogue one. Openreach's national stop-sell in September 2023 means new analogue lines cannot be ordered anywhere in the UK, and most changes to existing ones are blocked too - including moving a line to a new address.
How do I find out how many phone lines my business has?
Check the standing charges on your bill rather than the call charges, count the lines listed, then walk the building and match sockets to those charges. Also try making two calls at once to test how many simultaneous calls you can handle. Businesses routinely find they are paying for lines nobody uses.
Will I lose my business phone number?
No. Your geographic number is portable and moves to the new digital service unchanged, including full DDI ranges. Porting is scheduled work that takes a couple of weeks to arrange, so plan it in - and never cease the old line before the number has moved.
Is a digital business line cheaper than a traditional landline?
Usually, yes. Digital services remove separate copper line rental, typically include UK calls rather than charging per minute, and bundle features that used to be paid extras. The gap has widened through 2026, because legacy wholesale line rental rose in stages across the year while digital pricing did not.