Business VoIP for Small Business UK 2026: Costs & Providers Quick Answer
For most UK small businesses, VoIP is now the most practical way to run a professional business phone system.
Instead of relying on a traditional telephone line, VoIP lets employees make and receive business calls over an internet connection using:
desk phones
computers
mobile apps
headsets
For a small business, we would usually compare systems based on:
Business size What we would compare first
1 person
App-based VoIP or simple digital business line
2-5 employees
Hosted VoIP with extensions, call routing and mobile apps
5-10 employees
Business VoIP with auto attendant, hunt groups and reporting
10-20 employees
Managed cloud phone system with integrations and admin controls
Remote/hybrid team
Softphone-first cloud VoIP
Customer-service team
VoIP with queues, recording and call analytics
Our View A small business should not buy a large corporate phone system just because it has more features.
The best system is usually the simplest one that gives you professional numbers + reliable calling + sensible call routing + room to grow.
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Key Takeaways
VoIP allows business calls to run over an internet connection rather than a traditional analogue telephone line. Small businesses can use desk phones, laptops and mobile apps on the same system.
A business number can normally be used by employees working from different locations.
Useful small-business features include call forwarding, voicemail, hunt groups and auto attendants.
You do not necessarily need a physical desk phone for every employee. Broadband reliability matters because VoIP depends on connectivity.
Businesses should check contract length, call allowances, handset costs and future price increases.
Existing business numbers can normally be ported to a new VoIP provider.
Businesses still using traditional phone services should review their setup before the January 2027 PSTN closure. Our view: compare cost per user, essential features and total contract value rather than simply choosing the cheapest licence.
How Do We Work?
Our comparisons are researched and reviewed by the Compare Your Business Costs editorial team using provider information, official UK guidance and business buying criteria. See how Compare Your Business Costs works .
Authored by: Ally Cox – Business Technology & B2B Services Specialist, 10+ years’ experience.
Reviewed by: James Ward – Telecoms Specialist, 12+ years’ experience.
Last Updated: November 2026
Contents
What Is VoIP for a Small Business? VoIP stands for Voice over Internet Protocol and allows calls to be made and received using an internet connection instead of a traditional analogue phone line.
A business VoIP system can give your company:
business telephone numbers
individual employee extensions
voicemail
call forwarding
call transfers
mobile and desktop apps
call queues
auto attendants
call reporting
Our View For small businesses, VoIP is really about separating the business phone number from a physical telephone line – y our staff can answer the same business system from:
the office
home
a laptop
a smartphone
That flexibility is one of the biggest advantages over an old-style phone system.
Which Small Businesses Should Use VoIP? VoIP can suit almost any business that regularly handles customer or supplier calls.
It is particularly useful for:
professional services
estate agents
recruitment firms
trades businesses
health and care providers
sales teams
customer-service teams
remote businesses
multi-location SMEs
You May Not Need a Full VoIP System If… You:
work alone
receive very few calls
are happy using a dedicated business mobile
do not need call routing or multiple users
In that case, a simple digital business line or app-based number may be enough.
Our View VoIP becomes much more valuable once two or more people need to answer the same business number.
That is when extensions, transfers, call groups and central voicemail start solving real problems.
How Much Does VoIP Cost for a Small Business? Most hosted business VoIP systems are priced per user, per month.
The total cost can include:
user licence
call plan
telephone number
desk phone
setup
number porting
call recording
CRM integrations
support
Typical Cost Structure
Cost How it is usually charged
VoIP licence
Per user/month
Calls
Included allowance or additional call plan
Desk phone
Purchase, rental or finance
Additional numbers
Monthly fee or included
Call recording
Included on some plans or paid upgrade
Setup
Free, fixed fee or implementation charge
Number porting
Included or one-off fee
Current Market Examples BT’s current Digital Voice for Business packages for larger small-business teams start from £15 per user per month ex VAT for their Essential package.
RingCentral’s current UK RingEX pricing starts from £12.99 per user per month on its advertised annual-payment Essentials pricing.
These are useful benchmarks rather than universal market prices.
Our View Do not compare £13 vs £15 and assume the £13 system is cheaper.
One system may include:
more call minutes
auto attendant
call recording
Microsoft 365 integration
while another charges separately.
Compare the package your business actually needs.
Best Small Business VoIP Setup by Team Size 1 Person You might only need:
one business number
mobile app
voicemail
call forwarding
A simple digital line can be enough.
2-5 Employees Look for:
individual extensions
call transfer
hunt groups
mobile apps
shared voicemail
5-10 Employees Useful additional features include:
auto attendant
call queues
call reporting
call recording where required
admin controls
10-20 Employees Start comparing:
CRM integration
Microsoft 365 integration
advanced reporting
call monitoring
multi-site functionality
Our View Buy licences according to job role rather than automatically giving everyone the most expensive package.
A receptionist may need advanced call handling – an employee who rarely receives calls may only need a basic softphone licence.
Which VoIP Features Does a Small Business Actually Need? Business Number Keep work calls separate from employees’ personal numbers.
Call Forwarding Send unanswered calls to another employee or device.
Call Transfer Move customers between team members without asking them to call another number.
Hunt Groups Ring several users in sequence or simultaneously.
Useful for:
Auto Attendant For example:
> Press 1 for sales, 2 for accounts and 3 for support.
This becomes more useful as teams grow.
Voicemail to Email Allows staff to receive voicemail notifications digitally.
Mobile & Desktop Apps Employees can use the business number without needing a dedicated desk phone.
Call Recording Useful for some:
sales
training
quality assurance
but businesses should consider their legal and data-protection responsibilities before recording calls.
Our View For a typical 5-person small business, our core shortlist would be business number + mobile app + extensions + transfer + hunt group + voicemail.
Add advanced features only when there is a genuine use case.
Small Business VoIP Providers to Compare BT Business BT offers digital business voice services for both very small businesses and larger teams and their current Digital Voice for Business offering includes:
UK business numbers
softphones
call forwarding
hunt groups on higher packages
auto attendant on higher packages
Webex collaboration options
Our View BT is an obvious benchmark if you also buy business broadband from BT or want a familiar single-provider route.
Do not assume bundling automatically makes it the cheapest choice.
RingCentral RingCentral currently offers cloud phone packages including:
business calling
desktop and mobile apps
team messaging
video meetings on relevant plans
IVR
call recording
Microsoft 365 integrations
CRM integrations on higher plans
Our View RingCentral is particularly worth comparing for businesses wanting communications beyond a basic telephone replacement.
8×8 8×8 is worth comparing for businesses wanting:
cloud calling
team communications
contact-centre capability
analytics
It becomes more relevant where calling is an important part of customer service or sales.
Gamma/Horizon Gamma Horizon is commonly supplied through UK telecoms partners and resellers and is worth comparing for:
SMEs
multi-site businesses
companies wanting account-managed telecoms support
Our View Do not shortlist VoIP providers using the brand name alone.
For SMEs, the quality of the reseller or managed provider supporting the platform can matter as much as the underlying software.
Does a Small Business Need VoIP Desk Phones? Not necessarily – employees can often call using:
desktop software
laptop + headset
mobile app
Physical desk phones remain useful for:
reception
customer-service desks
shared work areas
employees handling frequent calls
Our View Do not automatically buy one desk phone per licence.
A six-person business might only need:
1 reception handset
2 desk phones for heavy call users
3 softphone users
That can reduce hardware cost and desk clutter.
Can You Use Business VoIP on a Mobile Phone? Yes. Many hosted VoIP systems have mobile apps.
This means an employee can:
receive calls to the business number
make outgoing calls showing the business number
access business voicemail
transfer calls
without publishing their personal mobile number.
Our View This is one of the most useful VoIP features for small businesses.
It allows the company to own the customer-facing number even when employees work remotely or on the road.
What Broadband Does Small Business VoIP Need? VoIP depends on a reliable internet connection.
Consider:
download speed
upload speed
latency
network stability
Wi-Fi quality
For a small number of VoIP users, raw bandwidth is rarely the main issue.
Reliability and network quality matter more.
Our View If the internet connection fails and your VoIP system fails with it, you need a backup plan.
This could include:
mobile-app failover
call diversion
4G/5G backup broadband
For businesses where phones are critical to revenue, resilience should form part of the buying decision.
Small Business VoIP & the UK PSTN Switch-Off The UK’s traditional analogue phone network is being retired.
Openreach states that traditional telephone lines will need to move to digital services by 31 January 2027.
That makes 2026 an important year for small businesses still using:
traditional landlines
ISDN
older telephone systems
But do not only check your telephones.
Traditional lines may also support:
alarms
CCTV
door-entry systems
payment equipment
lift lines
Our View Do not treat the PSTN migration as simply replacing one telephone handset.
Audit everything attached to the old line before switching.
Can You Keep Your Existing Business Number? Usually, yes. Business numbers can generally be ported to a new VoIP provider where the relevant number and service support porting.
Before cancelling your old telephone service complete the number-porting process first.
Cancelling too early can create complications.
Our View Your business telephone number may be a valuable customer asset.
If it appears on:
Google
your website
signage
vehicles
directories
confirm the porting plan in writing.
VoIP for Remote & Hybrid Small Businesses VoIP works particularly well for distributed teams because the phone system is not tied to the office.
Employees can share:
one business number
extensions
call routing
voicemail
while working from different locations.
Example A five-person company could have:
2 office employees
2 home workers
1 field salesperson
All five can appear to customers as part of the same telephone system.
Our View This is much more professional and manageable than giving customers five different employee mobile numbers.
Small Business VoIP Integrations VoIP can integrate with tools such as:
Microsoft 365
Microsoft Teams
Google Workspace
CRM systems
helpdesk platforms
Possible benefits include:
click-to-call
customer records appearing during calls
automatic call logging
shared contacts
Our View A three-person business probably does not need complex CRM integration simply because the provider offers it.
It becomes valuable when employees currently waste time manually logging calls or looking up customer information.
VoIP Contracts & Hidden Costs to Check Before signing, ask about:
minimum contract length
monthly price per user
annual price increases
inclusive call allowance
mobile-call charges
international calls
additional numbers
handset rental
setup
number porting
call recording
integrations
support
early termination
Annual Price Increases Some providers currently publish scheduled increases during the contract.
For example, BT’s Digital Voice for Business pricing currently states that relevant user licences increase by £1 per user per month from 1 April each year.
For 10 users, that becomes £10/month or £120/year after one increase.
Our View Always calculate the expected total cost across the minimum contract.
The month-one price is not enough.
How to Compare Small Business VoIP Quotes Before requesting quotes, prepare:
number of users
existing phone numbers
average call volume
number of desk phones required
remote workers
business locations
call-routing requirements
recording requirements
CRM/integration requirements
existing contract end date
Then ask each provider to quote against the same specification.
Example Requirement
8 users
1 existing business number to port
3 desk phones
5 laptop/mobile users
Auto attendant
Sales hunt group
Voicemail to email
Microsoft 365 integration
UK calling
This creates a much better comparison than simply asking:
How much is VoIP?”
Our View Ask providers to show the total monthly cost for the whole team, not only the licence price.
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Our Verdict: What Is the Best VoIP System for a Small Business? Our starting approach is:
1 person: simple digital line or app-based VoIP.2-5 employees: hosted VoIP with extensions and call groups.5-10 employees: add auto attendant, reporting and better admin controls.10-20 employees: compare managed systems, integrations and advanced call handling.Remote team: prioritise mobile and desktop softphones.Sales/support team: prioritise queues, reporting and recording where appropriate.
CYBC Verdict Small businesses usually do not need the most sophisticated VoIP platform.
They need one that answers calls reliably + routes customers properly + works wherever employees are + remains easy to manage.
Start with your required users and call workflow.
Then compare features + broadband resilience + support + full contract cost.
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Small Business VoIP FAQs What is VoIP for small business?
VoIP is a cloud or internet-based phone service that lets businesses make and receive calls without relying on a traditional analogue telephone line.
How much does business VoIP cost?
VoIP is commonly priced per user per month. The total depends on call allowances, features, handsets, integrations, support and contract length.
Is VoIP suitable for a one-person business?
Yes, although a simple digital business number or app-based system may be more appropriate than a complex multi-user phone platform.
Is VoIP good for a small team?
Yes. It becomes particularly useful when multiple employees need to answer the same business number, transfer calls or work from different locations.
Do I need desk phones for VoIP?
No. Many systems can run through mobile and desktop apps. Desk phones remain useful for reception and frequent call users.
Can VoIP work on mobile phones?
Yes. Most modern hosted VoIP systems provide smartphone apps that allow staff to use the business number remotely.
Can I keep my existing business number?
Usually, yes. Confirm number portability with the new provider before cancelling the existing service.
Does VoIP need broadband?
Yes. Hosted VoIP depends on internet connectivity, so broadband quality and resilience should form part of the buying decision.
What happens if the broadband goes down?
Options vary by provider. Calls may be diverted to mobiles or other numbers, while some businesses use backup broadband for resilience.
What VoIP features does a small business need?
Typical essentials include business numbers, extensions, call transfer, hunt groups, voicemail and mobile/desktop apps.
Does a small business need an auto attendant?
Not always. It becomes useful when callers regularly need routing to different departments or teams.
Can VoIP integrate with Microsoft 365?
Many providers offer Microsoft 365 or Microsoft Teams integrations, but functionality and pricing vary.
When is the PSTN switch-off?
Openreach states that the traditional PSTN network will close on 31 January 2027, making it important for businesses still using legacy services to prepare for migration.
Can VoIP replace ISDN?
Yes. Hosted VoIP and SIP-based digital services are common replacements for older ISDN phone systems.
Should I compare several VoIP providers?
Yes. Compare the same number of users, features, handsets and call requirements to get meaningful like-for-like quotes.
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Hi, I’m Ally Cox , a senior copywriter and blogger at CompareYourBusinessCosts.co.uk, the UK’s trusted platform for comparing business services.over a decade of experience in the B2B sector, I specialise in simplifying complex topics like leased lines, VoIP, business energy, HR and payroll solutions, accounting software, and EPOS systems .HR, copywriting, and business operations- from clocking-in systems to card machines and office technology .informed, confident decisions when choosing products and services that improve efficiency and save money.
