Cheap Business Phone Line UK: Compare Prices from £1.70/mo

If you're a small business owner in the UK looking for a cheap business phone line, the pricing landscape can be confusing. Some providers advertise low headline prices but charge per user, per minute, or lock you into 12-24 month contracts. Others bundle everything in but cost £15-20/month before you've made a single call.

This guide compares the real cost of 6 UK business phone line providers, breaks down the hidden fees to watch for, and helps you find the best value for your business.

What does a business phone line actually cost in the UK?

The cost of a business phone line depends on what type of service you choose. Here's how the market breaks down in 2026:

Traditional landline (dying out)

The old copper PSTN network that powered UK landlines for decades is being switched off by 2027. BT, TalkTalk, and other traditional providers are migrating all customers to digital (VoIP) lines. If you're still paying for a traditional landline, you'll be moved to an internet-based service soon anyway.

Cost: £15-30/month, plus call charges. Not worth setting up from scratch.

VoIP per-seat providers

Most modern business phone providers — like bOnline, XLN, RingCentral, and 8x8 — use VoIP (Voice over Internet Protocol). Calls travel over the internet instead of copper wires.

The catch with most VoIP providers is per-seat pricing. That £7/month headline price? It's per user. A team of 3 is £21/month. A team of 5 is £35/month. And that's before you add SMS, call recording, or other features that often sit behind higher-tier plans.

Cost: £7-20 per user, per month.

Virtual number services

Virtual number providers give you a real UK phone number that works through an app on your existing phone. No hardware, no SIM card, no engineer visit. These tend to be the cheapest option and are ideal for small businesses, freelancers, and tradespeople.

Cost: £2-10/month total (not per user).

The hidden costs of "cheap" providers

A low headline price doesn't always mean a low total cost. Here are the fees that catch people out:

Per-seat pricing traps

The most common gotcha. A provider advertising "from £7/month" often means £7 per user per month. For a plumber with one office admin and one apprentice, that's already £21/month — not £7. Always check whether the price is per user or per account.

Setup and activation fees

Some providers charge £10-50 to activate your line or port your existing number. Others charge for "onboarding" or "configuration." Line charges nothing — you sign up and your number is ready in minutes.

Contract lock-in

Many business phone providers require 12 or 24-month contracts. If your business needs change, you're stuck paying for a service you don't use. Look for month-to-month billing with no cancellation fees.

Call minute charges

Some plans include a limited number of minutes (say 100 or 500), then charge 3-10p per minute after that. Others include "unlimited" calls but exclude mobiles or international numbers. Check the fair usage policy.

SMS costs extra

Most traditional VoIP providers don't include SMS at all, or charge per message on top of your plan. If your customers text you — and most do — this adds up quickly. With Line, SMS is included in every plan.

Feature gating

Basic plans often strip out the features you actually need: call recording, business hours, voicemail transcription, team inbox. You end up on the "Pro" or "Business" tier at 2-3x the headline price to get what you expected.

Provider comparison: 6 UK business phone line options

Here's an honest look at 6 options available in the UK right now. Prices are correct as of April 2026.

Line

Line is a virtual business phone system designed for small businesses. You get a real UK mobile number with SMS, voice calls, and a shared team inbox — all from an app on your existing phone.

• Price: £1.70 for the first month, then from £5/month
• Per-seat charges: None — your whole team shares the number
• Contract: No contract, cancel anytime
• SMS: Included
• Key features: Shared team inbox, business hours, call forwarding, voicemail, mobile app

bOnline

bOnline is a UK-based VoIP provider targeting small businesses. They offer desk phones and softphone apps.

• Price: From £7/user/month
• Per-seat charges: Yes — per user
• Contract: 12-month minimum on most plans
• SMS: Not included on basic plans
• Key features: Desk phone support, call routing, auto-attendant on higher plans

XLN

XLN offers bundled business services (broadband, phone, energy) for small businesses. Their phone packages are designed to replace a traditional landline.

• Price: From ~£10/month
• Per-seat charges: Yes, on some plans
• Contract: 12-24 month contracts
• SMS: Not included
• Key features: Broadband bundles, landline replacement, basic call management

Number People

Number People (thenumberpeople.co.uk) offer virtual UK phone numbers with call forwarding. They're one of the cheaper options for a basic number.

• Price: From ~£2/month
• Per-seat charges: No
• Contract: Monthly rolling
• SMS: Not included
• Key features: Call forwarding, basic voicemail — minimal features beyond that

Telecoms World

Telecoms World is a UK business telecoms provider offering hosted VoIP systems with a range of features aimed at growing teams.

• Price: Varies (typically £8-15/user/month)
• Per-seat charges: Yes
• Contract: 12-month contracts typical
• SMS: Limited or add-on
• Key features: Hosted PBX, CRM integrations, call analytics on higher plans

BT Business

BT is the UK's largest telecoms provider. Their business phone packages include both traditional and VoIP options, though pricing reflects the brand premium.

• Price: From £15/month (digital voice line)
• Per-seat charges: Yes, for additional users
• Contract: 12-24 month contracts
• SMS: Not included as standard
• Key features: Brand recognition, broadband bundles, UK-wide engineer support

Side-by-side comparison

The table makes the trade-offs clear. Number People is cheap but bare-bones — you get a number and call forwarding, nothing else. The mid-range VoIP providers (bOnline, XLN, Telecoms World, BT) offer more features but charge per user and lock you into contracts. Line is the only option that combines a low flat price with SMS, team features, and no contract.

What to look for in a cheap business phone line

Price matters, but the cheapest option is only good value if it actually does what you need. Here's a checklist:

• Real UK number — a proper 01, 02, or 07 number that customers recognise and trust. Avoid providers that give you odd-looking numbers.
• SMS included — if customers text your business number and get no reply, that's a lost lead. Make sure SMS is part of the package, not a paid add-on.
• No per-seat pricing — if you have (or plan to have) a team, per-seat pricing gets expensive fast. Look for a flat monthly price.
• No long contracts — your needs change. Monthly rolling billing means you're never locked in.
• Shared inbox — multiple team members should be able to see and reply to calls and messages from the same number. This stops customers falling through the cracks.
• Mobile app — you need to make and receive business calls from anywhere, not just the office. A good app turns your existing phone into your business phone.
• Business hours — automatically route calls to voicemail outside working hours so you can switch off in the evening and at weekends.

Do you even need a "phone line" anymore?

The traditional idea of a business phone line — a copper wire into your premises with a desk phone plugged in — is going away. The PSTN switch-off means every UK phone line will run over the internet by 2027.

This is actually good news for small businesses. Internet-based phone systems are cheaper, more flexible, and come with features that traditional landlines never had: SMS, shared inboxes, business hours, mobile apps, and call recording.

You don't need to wait for an engineer. You don't need to buy a desk phone. You don't even need a second mobile. With a virtual business number from Line, you get a fully functional business phone line on your existing phone in under 3 minutes.

If you're starting a business, going self-employed, or just want to stop giving out your personal number to customers, a virtual number is the simplest and cheapest way to get a proper business phone line in the UK.

Next steps

If you're comparing cheap business phone lines in the UK, here's a quick way to decide:

• Just need a number for call forwarding? Number People is the cheapest bare-bones option at ~£2/month.
• Need SMS, calls, and team features without per-seat pricing? Line starts at £1.70/month with everything included and no contracts.
• Want a traditional VoIP system with desk phones? bOnline or BT Business will work, but expect to pay £7-15+ per user per month on a 12-month contract.

For most small businesses, freelancers, and tradespeople, a virtual number like Line gives you the best combination of price and features. You can sign up and have your number in under 3 minutes — no paperwork, no hardware, no commitment.