VoIP Phone System Providers UK 2026: Compare Business VoIP Companies, Features & Quotes Quick answer
The best VoIP phone system provider for your business depends on your team size, call volume, current phone setup, remote working needs, support expectations and whether you need hosted VoIP, SIP trunking, Microsoft Teams Phone, UCaaS or contact centre features.
For most UK SMEs, the best provider is not simply the cheapest one. It is the provider that gives you the right mix of call quality, support, features, number porting, security, uptime, contract terms and monthly cost.
Most UK businesses pay around £10 to £25 per user per month for hosted VoIP.
Compare VoIP phone system providers now and see whether your business could save up to 40%.
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Authored by: Ally Cox (Business Technology & B2B Services Specialist 10+ Years’ Experience)
Reviewed by: James Ward (Telecoms Specialist, 12+ Years Experience)
Last Updated: July 2026
Contents:
What is a VoIP phone system provider?
How to compare VoIP providers properly
Best VoIP provider by business need
Best VoIP provider by business size
VoIP Provider comparison table
What features should VoIP providers offer?
What should be included in a VoIP quote?
VoIP phone system providers at a glance
Provider type Best for
Hosted VoIP providers
SMEs replacing landlines
Gamma Horizon, bOnline, BT Cloud Voice, Vodafone, Vonage
UCaaS providers
Remote, hybrid and multi-site teams
RingCentral, 8×8, Vonage, GoTo Connect
Microsoft Teams Phone providers
Businesses already using Microsoft 365
Microsoft Teams Phone, Operator Connect and Direct Routing providers
SIP trunk providers
Businesses with an existing PBX
Gamma, Spitfire, BT, Vodafone, Focus Group, Redcentric
Contact centre VoIP providers
Sales, support and call-heavy teams
Aircall, 8×8, RingCentral, Dialpad
Budget VoIP providers
Small teams and cost-conscious SMEs
bOnline, 3CX, app-based VoIP providers
UK telecoms providers
Businesses wanting managed support
BT, Gamma, Vodafone, Daisy, Focus Group, Redcentric
Cloud-first software providers
Teams wanting apps and integrations
RingCentral, 8×8, Dialpad, Aircall, Vonage
Need to compare VoIP providers? This quote service is best for UK businesses that want to compare:
VoIP phone system providers
hosted VoIP providers
cloud phone system providers
business phone system providers
SIP trunk providers
Microsoft Teams Phone providers
UCaaS providers
contact centre VoIP providers
call recording providers
VoIP providers for small businesses
VoIP providers for multi-site businesses
VoIP migration before the PSTN switch-off
business phone system quotes
Key takeaways
The best VoIP provider depends on your business size, call volume, features, support needs and current phone setup.
Hosted VoIP providers are usually best for SMEs replacing landlines or old office phone systems.
SIP trunk providers can suit businesses that want to keep an existing PBX.
Microsoft Teams Phone can suit businesses already using Microsoft 365, but calling plans, routing and support still need to be priced properly.
UCaaS providers are usually best for remote, hybrid and multi-site teams that want calling, messaging and video in one platform.
Contact centre VoIP providers are best for sales, support, booking and customer service teams.
The cheapest VoIP provider is not always the best if support, call quality, number porting or uptime are weak.
Most UK SMEs pay around £10 to £25 per user per month for hosted VoIP, depending on features and provider.
Businesses using PSTN, ISDN or old PBX systems should compare VoIP providers before the January 2027 switch-off.
Comparing providers side by side can help reduce costs, avoid poor-fit contracts and improve call reliability.
Compare VoIP phone system providers before choosing or renewing your business phone system.
What is a VoIP phone system provider? A VoIP phone system provider supplies internet-based business phone services and also might supply you with:
business phone numbers
hosted VoIP
Cloud PBX
SIP trunks
Microsoft Teams Phone setup
call bundles
desk phones
softphone apps
mobile apps
call recording
call queues
auto attendant menus
voicemail
call analytics
CRM integrations
contact centre tools
number porting
setup and support
How to compare VoIP providers properly Do not compare VoIP providers by headline monthly price alone.
A cheap provider may look attractive, but the full cost can change once you add call bundles, desk phones, call recording, number porting, setup, support and contract terms.
Compare providers using these criteria:
What to compare Why it matters
Monthly cost per user
Main cost for hosted VoIP and UCaaS
SIP channel pricing
Main cost for SIP trunking
Call bundles
Some providers include calls; others charge usage separately
Number porting
Important if you want to keep existing numbers
Setup and onboarding
Can affect migration speed and staff adoption
Call quality
Poor quality can lead to missed or frustrating calls
Support level
Critical if phones are important to sales or customer service
Contract length
Long contracts may reduce price but reduce flexibility
Hardware
Desk phones, headsets and conference phones may add cost
Mobile and desktop apps
Important for remote and hybrid teams
Call recording
Useful for training, compliance and dispute handling
CRM integration
Important for sales and support teams
Security
Encryption, MFA, fraud monitoring and call recording controls matter
Uptime and resilience
Important for businesses that rely on inbound calls
Scalability
The system should handle future users, sites and features
Best VoIP provider by business need
Business need Provider type to compare first Why
Replace old landlines
Hosted VoIP provider
Simple migration from traditional phone lines
Keep existing PBX
SIP trunk provider
Lets you move calls to IP without replacing everything
Use Microsoft Teams for calls
Teams Phone provider
Adds external calling to Microsoft Teams
Support remote workers
Cloud VoIP or UCaaS provider
Works across apps, laptops and mobiles
Run a sales team
Contact centre VoIP provider
Supports call recording, queues and CRM integration
Run a small office
Hosted VoIP provider
Predictable per-user pricing and easy management
Connect multiple sites
UCaaS or managed VoIP provider
Centralised users, reporting and administration
Reduce phone costs
Quote comparison across hosted VoIP, SIP and Teams
The cheapest route depends on setup
Improve missed call handling
Hosted VoIP with call routing
Hunt groups, voicemail and opening hours routing
Improve customer support
Contact centre or advanced hosted VoIP
Queues, analytics and call monitoring
Prepare for PSTN switch-off
Hosted VoIP, SIP or Teams provider
Moves your calls away from old landlines
Best VoIP provider by business size
Business size
Best provider type
1 user
App-based VoIP or simple hosted VoIP
Low cost, business number, mobile app
2-5 users
Hosted VoIP provider
Shared number, voicemail, call forwarding
6-20 users
Hosted VoIP or UCaaS provider
Hunt groups, reporting, support and apps
20-50 users
Managed hosted VoIP, UCaaS or Teams Phone
Onboarding, call routing and user management
50+ users
UCaaS, SIP trunking or managed telecoms provider
Resilience, SLAs, integrations and multi-site support
Call centre team
Contact centre VoIP provider
Queues, recording, analytics and CRM integration
Existing PBX user
SIP trunk provider
Channel pricing, porting, failover and support
VoIP provider comparison table
Provider Best for Strength Watch out for
RingCentral Growing and multi-site teams
UCaaS platform, apps, integrations
May be more than a small team needs
8×8 Remote, hybrid and contact-heavy teams
Voice, video, messaging and contact centre options
Check plan features carefully
Vonage SMEs wanting cloud calling
Flexible cloud phone tools
Compare support and package details
Gamma HorizonUK SMEs and managed hosted VoIP
Common UK business VoIP platform
Often supplied through partners/resellers
BT Cloud Voice Businesses wanting major UK telecoms provider
UK telecoms brand and connectivity options
Compare price and contract against alternatives
Vodafone Business VoIP Businesses bundling telecoms
Useful alongside connectivity and mobile services
Check bundle value and support terms
bOnline Small businesses
SME-focused VoIP and broadband options
Compare scalability as you grow
3CX Budget-conscious or technical teams
Flexible system and PBX-style control
May need more technical setup
Aircall Sales and support teams
CRM integration and call workflows
More suited to call-heavy teams
Dialpad Modern teams wanting AI features
Call insights and app-led experience
Check UK calling and support fit
Microsoft Teams Phone
Microsoft 365 users
Calling inside Teams
Full setup can need extra licences or routing
GoTo Connect SMEs and remote teams
Cloud communications platform
Compare plan features and UK fit
Spitfire SIP and UK telecoms services
SIP trunking and connectivity focus
May be more technical than simple hosted VoIP
Daisy Communications Managed telecoms for SMEs
Broad business telecoms services
Compare contract and support carefully
Focus Group Managed business telecoms
VoIP, connectivity and managed services
Redcentric Larger and managed-service buyers
Business communications and managed services
More suited to complex requirements
What features should VoIP providers offer? Most business VoIP providers should offer the core features below.
Feature Why it matters
Business phone numbers
Keeps business and personal calls separate
Number porting
Lets you keep existing numbers
Mobile app
Supports remote and mobile workers
Desktop app
Useful for office and hybrid teams
Voicemail
Voicemail to email
Makes messages easier to manage
Call forwarding
Sends calls to the right person or device
Hunt groups
Rings multiple users until someone answers
Auto attendant
Routes callers to sales, support, accounts or reception
Call queues
Call recording
Helps with training, compliance and disputes
Call reporting
Shows missed calls, volume and busy periods
CRM integration
Links calls to customer records
Admin portal
Lets you manage users and call routing
Secure login
Protects admin access and user accounts
Support
Helps resolve issues quickly
Failover
Keeps calls moving during outages
What should be included in a VoIP quote? A proper VoIP quote should be clear about all costs, so be sure to ask providers to show:
monthly cost per user
call bundle or usage charges
SIP channel costs, if relevant
setup fees
number porting fees
desk phone costs
headset costs
call recording charges
CRM integration costs
contact centre add-ons
admin portal access
support level
contract length
cancellation fees
renewal terms
broadband or connectivity requirements
VAT
installation or onboarding costs
If two providers quote the same monthly price, the better deal may be the one with stronger support, faster migration and fewer hidden add-ons.
How much do VoIP providers cost? Most UK SMEs pay around £10 to £25 per user per month for hosted VoIP.
VoIP provider type Typical cost Best for
Basic hosted VoIP
£8-£15 per user/month
Standard hosted VoIP
£10-£25 per user/month
Most SMEs
UCaaS
£18-£30+ per user/month
Hybrid and multi-site teams
Microsoft Teams Phone
£8-£25+ per user/month, depending on setup
SIP trunking
£3-£10 per channel/month
Contact centre VoIP
£40-£100+ per agent/month
Desk phones
£40-£200+ each
Office, reception and shared spaces
Setup and migration
£0-£500+
Mistakes to avoid when comparing VoIP providers Choosing the cheapest provider without checking support
Cheap VoIP can become expensive if call quality is poor or support is slow.
Comparing only monthly licence fees
A low licence fee may not include calls, setup, porting, call recording or support.
Forgetting number porting
Keeping your number can be essential. Always check porting before cancelling an old service.
Buying desk phones for every user
Many users can work with softphones, apps and headsets.
Choosing Teams Phone without pricing the full setup
Teams Phone may require licences, calling plans, Operator Connect, Direct Routing or specialist support.
Paying for contact centre tools too early
If you only need basic calling, contact centre tools may be overkill.
Ignoring broadband quality
VoIP depends on stable connectivity. Poor broadband causes call quality issues.
Signing a long contract before testing the provider
Long contracts can reduce flexibility if your business needs change.
Not checking security
Admin access, MFA, call recording, fraud controls and data storage should all be reviewed.
Waiting too long to move from old landlines
Businesses still using PSTN or ISDN should plan before the January 2027 switch-off.
When should you switch VoIP provider? You should compare or switch VoIP providers if:
your phone contract is ending
your costs have increased
support is poor
call quality is unreliable
you still use landlines or ISDN
you need to prepare for the PSTN switch-off
you are hiring more staff
you are moving office
you need remote or hybrid working
you need call recording
you need CRM integration
you want Microsoft Teams Phone
you need SIP trunks
you have multiple sites
you are paying for unused features
your current provider cannot scale with you
Compare quotes before renewing, migrating or adding new users.
FAQs about VoIP phone system providers Who are the best VoIP phone system providers in the UK?
Popular UK business VoIP providers include RingCentral, 8×8, Vonage, Gamma Horizon, BT Cloud Voice, Vodafone Business VoIP, bOnline, 3CX, Aircall, Dialpad, Microsoft Teams Phone, GoTo Connect, Spitfire, Daisy Communications, Focus Group and Redcentric.
What is the best VoIP provider for small businesses?
For many small businesses, the best option is a hosted VoIP provider with mobile apps, desktop apps, number porting, call forwarding, voicemail and reliable support.
What is the cheapest VoIP provider?
The cheapest provider depends on users, call volume, features and contract length. Basic app-based VoIP or hosted VoIP can be cheap for very small teams, while SIP trunking can be cheaper for businesses with an existing PBX.
What is the best VoIP provider for Microsoft 365 users?
Microsoft Teams Phone is worth comparing if your business already uses Microsoft 365. However, hosted VoIP may still be better if you need traditional phone system features or hands-on telecoms support.
What is the best VoIP provider for sales teams?
Sales teams should compare providers such as Aircall, Dialpad, RingCentral and 8×8, especially if they need call recording, CRM integration, analytics and call workflows.
What is the best VoIP provider for remote teams?
Remote teams should compare UCaaS and cloud VoIP providers such as RingCentral, 8×8, Vonage, Dialpad, Microsoft Teams Phone and GoTo Connect.
What is the best VoIP provider for SIP trunking?
SIP trunk providers to compare include Gamma, BT, Vodafone, Spitfire, Focus Group, Daisy Communications and Redcentric, depending on PBX setup, channel needs and support requirements.
How much do VoIP providers charge?
Most hosted VoIP providers charge around £10 to £25 per user per month. SIP trunking is usually priced per channel, while contact centre VoIP is usually priced per agent.
Can I keep my phone number when switching VoIP provider?
Yes, in most cases. This is called number porting. Check the porting process before cancelling your current phone service.
How long does it take to switch VoIP provider?
A simple setup can be quick, but number porting, desk phones, call routing, Microsoft Teams Phone or multi-site migrations can take longer.
Do VoIP providers include desk phones?
Some providers include desk phones in packages, while others charge separately. Many businesses now use softphones, mobile apps and headsets instead.
Do VoIP providers include call recording?
Some include basic call recording, while others charge extra. Businesses should also check storage, access controls and retention settings.
Are VoIP providers secure?
VoIP providers can be secure, but businesses should check encryption, MFA, fraud monitoring, call recording controls, data storage and support processes.
Is hosted VoIP better than SIP trunking?
Hosted VoIP is usually better for businesses that want a full cloud phone system. SIP trunking can be better for businesses that want to keep an existing PBX.
Is Microsoft Teams Phone better than hosted VoIP?
It depends. Teams Phone can be good for Microsoft 365 users, but hosted VoIP may be simpler for businesses that need traditional call handling, receptionist features or telecoms support.
Will the PSTN switch-off affect VoIP provider choice?
Yes. If your business still uses traditional landlines, ISDN, alarms, lifts, fax machines or payment devices, choose a provider that can help you migrate before the January 2027 switch-off.
Should I compare VoIP providers before renewing?
Yes. Comparing providers before renewal can help reduce costs, improve support and avoid being locked into a poor-fit contract.
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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.
