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, it's worth understanding what you've got - because the answer affects your costs, your numbers and your options.
What a business landline actually is
A landline is a telephone connection that's 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, but provided under a business contract. The line itself isn't 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 bits that make up a "line"
People use "landline" loosely, but a business phone setup is usually made of three separate things:
- The physical connection - the copper (or now fibre) running into your building.
- The line rental - the ongoing charge for keeping that connection active. We explain this in business line rental.
- The number - the geographic phone number (like an 0161 or 020 number) that customers dial. Numbers can be moved between providers, as we cover in keeping your business landline number.
Understanding that these are separate helps when you're comparing quotes or planning a switch - you're rarely just buying "a phone".
Types of business landline
Most UK businesses fall into one of these camps:
- A single analogue line (PSTN) - one line, one number, a basic handset. Common for very small businesses, shops and back-office lines.
- Multiple analogue lines - several individual lines, often with one advertised number that "hunts" to the next free line.
- ISDN lines (ISDN2 or ISDN30) - older digital lines that carry multiple simultaneous calls (channels), usually feeding an on-site phone system. See ISDN replacement for business.
- Lines with Direct Dial-In (DDI) - a block of numbers so individuals or departments each have their own direct number.
If you're not sure which you have, your phone bill and the number of simultaneous calls you can make are the biggest clues. Our multi-line phone systems guide explains lines and channels in more detail.
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+ |
| Fault fix targets | Best effort | Often backed by an SLA |
| Billing | Personal | VAT invoice, itemised |
| Extra lines & numbers | Limited | Multiple lines, DDI, hunt groups |
| Features | Basic | Call divert, recording, analytics (via a system) |
For a deeper look at the features you can layer on, see landline calling features explained.
Why landlines are changing
Here's the important part. The traditional analogue network - the PSTN - is being retired. Openreach will switch it off on 31 January 2027, and you can no longer order brand-new analogue lines in most areas. We cover the full timeline in our PSTN/ISDN switch-off guide.
That doesn't 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's a simple Digital Voice line that plugs into a router, or a full hosted telephony system. You can compare your options in analogue line replacement.
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. If you understand the line, the rental and the number as separate things, you'll find the switch far easier to navigate. Want a hand? Explore our Cloud Telephony service or request a callback.
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 and billing. Traditionally it ran over copper wires; new lines are increasingly digital, carried over an internet connection.
Is a business landline different from a home phone line?
The underlying connection is the same, but business lines come with faster support, clearer service levels, VAT billing and the ability to add multiple lines, direct-dial numbers and phone-system features.
Are business landlines being phased out?
The copper network behind traditional landlines is being switched off by 31 January 2027. Fixed business numbers continue, but they now run digitally over the internet rather than over analogue copper lines.
Can I still get a new business phone line?
Yes, but in most areas it will be a digital line rather than a traditional analogue one, because Openreach stopped selling new analogue lines in 2023 ahead of the switch-off.
