How Much Does a Business Phone Line Cost in the UK?

Quick answer

As a guide, a traditional analogue business line has typically cost £15-£25 per line per month in rental, with calls charged per minute on top - but legacy wholesale prices rose in stages through 2026, roughly doubling, so that range is now at the top end or beyond. A digital replacement is priced per user rather than per line, usually with inclusive UK calls, and for most businesses the total lands lower than what they were paying for copper. The single biggest variable is not the price per line: it is how many lines you are paying for that nobody uses.

"How much is a business phone line?" sounds like it should have a simple answer, but the bill is made up of several parts and the numbers are moving fast as the copper network is retired. Here is a clear breakdown so you can budget properly and, more usefully, spot when you are paying too much. All figures below are illustrative guide ranges as at August 2026 - anyone quoting you a precise national average has not looked at your bill.

The parts of a phone line bill

Before comparing prices, it helps to know what you are actually paying for:

• Line rental - the fixed monthly or quarterly charge for keeping the line active. This is the part that rose sharply on legacy lines through 2026.
• Call charges - per minute or per call, unless you have an inclusive bundle. Watch the destinations: mobiles, 08 numbers and international are usually priced separately.
• Number and feature charges - extra numbers, DDI ranges, call divert, caller display and similar.
• Setup or installation - a one-off for new lines or an engineer visit.
• Phone system - if you run a PBX or hosted system, that is a separate cost on top.
• Broadband - historically sold on top of a phone line, which is why many businesses were effectively paying line rental to get internet.

We dig into the rental element specifically in business line rental explained.

Guide costs by type of service

Two observations from that table. First, the old products are the expensive ones now - which is unusual, and entirely deliberate on Openreach's part. Second, the pricing unit changes from lines to users, and that is what actually reshapes most bills. A ten-person office might have had four lines; on a hosted system it has ten users. Whether that is cheaper depends on your call volumes and how much of your old bill was per-minute charges, which is why a like-for-like comparison needs your actual usage rather than a headline rate.

The 2026 price rises you need to know about

This is the headline cost story. Openreach increased the wholesale price of its legacy line products (Wholesale Line Rental) in stages to push the final migration off copper:

• +20% from 1 April 2026
• a further rise to around +40% above the previous level from 1 July 2026
• and again from 1 October 2026 - roughly doubling wholesale costs within the year

Those are wholesale increases that providers pass on, so if you are still on old analogue lines your bill has climbed noticeably during 2026 and will climb again. We cover the detail in the WLR withdrawal price rises.

The practical point for budgeting: the baseline you are comparing against has moved. A quote that looked marginal against a January 2026 bill often looks obvious against an October 2026 one.

How digital changes the maths

Moving to a digital line or hosted telephony reshapes the bill rather than just discounting it:

• No separate copper line rental - voice rides over your internet connection.
• Inclusive UK calls are common, so per-minute charges shrink or disappear. For businesses making a lot of outbound calls, this is frequently the largest single saving.
• Features included - voicemail-to-email, divert, auto-attendant and more come as standard rather than as paid extras.
• Per-user pricing that scales up and down without engineer visits or new physical lines.
• One connectivity bill instead of broadband layered on top of a phone line.

For a full hosted-system breakdown see how much hosted telephony costs, and for the one-off costs of migrating, what the PSTN switch-off costs a business. If you would rather see the numbers for your own setup than read ranges, get a no-obligation quote and we will price it against your current bill.

Worked example: a four-line office

Illustrative, to show the shape rather than to quote you a price.

The audit usually matters more than the tariff here. Four lines on the bill very often turns out to be two lines in use, a fax line nobody has used for years, and a line feeding a card terminal that moved to mobile data long ago. Cancelling those is an immediate saving that no amount of negotiating a better per-line rate would have achieved.

What pushes your cost up or down

The single most valuable row is the first one. See multi-line phone systems and channels for how to size capacity properly.

How to read your bill and spot overpaying

Give yourself half an hour and three months of bills:

1. List every standing charge, separately from call charges. Standing charges are what you pay for existing.
2. Count the lines and compare with the phones you can physically see. Note any gap.
3. Walk the building. Match each socket to a charge. Look for phone cables running to alarms, lifts, card terminals, door entry and fax machines - see devices that rely on phone lines.
4. Total your call spend by destination. If most of it is to mobiles, an inclusive-mobile package is where your saving is.
5. Check your contract end date and notice period before you negotiate anything.
6. Look for anything you cannot explain - and do not cease it until you know what it does.

Hidden costs worth asking about

• Mid-term price increases. Ask for them in pounds and pence, in writing, for each year of the term.
• Early termination charges on your current contract, which may change the timing rather than the decision.
• Porting fees for numbers, particularly per-number charges on a large DDI range.
• Handset costs - and whether existing IP handsets can be reused, which they often can.
• Connectivity install charges, especially where fibre has to be brought into an older building.
• Minimum terms on the connectivity as well as the voice service, since they may not align.

How to avoid overpaying

• Check what you are actually using. Paying rental on lines nobody calls is pure waste, and it is the commonest finding in any audit.
• Do not ride out the 2026 rises on legacy lines if you can migrate sooner - you are paying a rising premium for a closing network.
• Compare like for like. A cheap line with expensive calls can beat a "free calls" deal, or lose to it, depending entirely on your usage.
• Bundle only when the numbers say so. Sometimes phone and broadband together is cheaper; sometimes it is not - see phone and broadband bundles.
• Size on concurrency, not headcount.
• Time it around your contract, not around the deadline panic.

The bottom line

A business phone line costs more than a single headline figure suggests, and legacy copper lines got materially more expensive through 2026 on a network that closes in January 2027. For most businesses, moving to a digital line or hosted system both cuts the per-line cost and removes the rising rental - but the bigger prize is usually the audit, because almost nobody is paying for exactly the lines they use.

Want a tailored figure rather than a range? Send us your last bill: get a no-obligation quote or call 0333 006 9399. We will tell you what your lines are, what you can cancel and what the replacement should cost.

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.