Compare VoIP Providers
Find the Best VoIP Provider for Your Business
Compare features, pricing, and reliability across the UK's leading VoIP providers. Get expert recommendations tailored to your business needs — and save up to 65% on your current telecoms spend.
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Featured VoIP Providers
10+ Leading UK VoIP Providers
We compare the most trusted VoIP solutions available to UK businesses today — reviewed and rated by our in-house telephony experts.
GH
Gamma Horizon
Best All-Round
3CX
3CX
Most Flexible
P+
Phoneline+
Best Value
bO
bOnline
Top Rated
LC
Lily Comms
Feature Rich
GW
Gradwell
Established
VG
Vonage Business
Enterprise
MT
MS Teams
Cloud Leader
8×8
8x8
Global
ZM
Zoom Phone
Familiar
Understanding VoIP Provider Systems
Each VoIP provider has unique strengths. Here's what makes the top four different and who they're best for — based on our experts' hands-on reviews.
| Provider | Key Features | Best For | |
|---|---|---|---|
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Best All-Round 9.7/10
Gamma Horizon
The UK's most popular hosted VoIP provider with enterprise-grade features at SMB-friendly pricing. A fully-managed cloud service — zero maintenance on your side.
From £12.95/user/month · Unlimited UK Local, National & Mobile Calls*
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Growing UK businesses (10–100 users) that want a fully managed, reliable system with first-class support. Perfect if you need call recording, video conferencing, and analytics out of the box — with no technical overhead. |
Get a Quote → |
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Most Flexible 9.5/10
3CX
A software-based phone system — not a fully managed service. You choose where it's hosted (on-premise, cloud, or hybrid) giving you complete control.
Pricing depends on host choice
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Tech-forward businesses and those with 10+ users who want deep customisation and cost efficiency. Ideal if you need specific integrations or want to build custom call workflows. Requires some technical assistance for initial setup. |
Get a Quote → |
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Best Value 9.4/10
Phoneline+
Designed for micro-businesses. Marketed as a landline replacement — converts your existing business line into a cloud VoIP service simply and affordably.
From £7.95/user/month · Unlimited UK Local, National & Mobile Calls*
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Sole traders, tradespeople, small retailers, and service businesses with 1–3 users who need a professional phone presence without complexity. Note: not designed to scale beyond a small team. |
Get a Quote → |
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Top Rated 9.0/10
bOnline
The only provider on this shortlist sold direct rather than via a partner network. High customer satisfaction and a packed feature set make it a strong choice.
From £13.95/user/month (unlimited plan)
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Small businesses that value strong customer support and simplicity. A great choice if you want to work directly with a UK provider rather than via a reseller — and want unlimited calling on a straightforward monthly plan. |
Get a Quote → |
Head-to-Head Comparison
Compare VoIP Provider Features
See how the top four VoIP providers stack up across the features that matter most to UK small businesses.
| Feature | Gamma Horizon Recommended | 3CX | Phoneline+ | bOnline |
|---|---|---|---|---|
| Monthly Cost (per user) | From £12.95 | Custom pricing | From £7.95 | From £13.95 |
| Free Call Bundle | ✓ Unlimited* | — SIP costs vary | ✓ Unlimited* | ✓ Unlimited plan |
| Call Recording | ✓ | ✓ | — | ✓ |
| Mobile App (iOS/Android) | ✓ | ✓ | ✓ | ✓ |
| Video Conferencing | ✓ | ✓ | — | ✓ |
| Auto-Attendant | ✓ | ✓ | — | ✓ |
| Team Messaging | ✓ | ✓ | — | — |
| CRM Integration | ✓ | ✓ | — | — |
| 24/7 UK Support | ✓ | ✓ via partners | ✓ via partners | ✓ |
| Scalability | Excellent | Excellent | Limited | Excellent |
| Fully Managed | ✓ | ✓via T2K | ✓ | ✓ |
*Unlimited Minutes and Free International Calls are subject to fair usage policy.
Key Benefits
Why Businesses Choose VoIP
Modern VoIP delivers enterprise-grade telephony at SMB-friendly prices — and transforms the way your team communicates.
💷
Lower Costs
No ISDN line rental. No expensive hardware to buy or maintain. No per-minute call charges eating into your margins. Plans start from £7.95/user and include generous free call bundles.
↓ Save up to 65% vs traditional lines
📱
Work From Anywhere
Your business number travels with you. Take and make calls on your mobile, laptop, or tablet. iOS and Android apps plus desktop softphones mean you're reachable wherever you work.
✓ iOS, Android & desktop apps
🎛️
Enterprise Features, SMB Price
Auto-attendants, call recording, voicemail-to-email, hunt groups, call parking, video conferencing, team messaging — previously reserved for big companies, now available from day one.
✓ 20+ features as standard
📈
Scales With You
Add or remove users in minutes. Most platforms scale to thousands of users, so the system you choose today will still serve you as your business grows — no costly hardware replacements needed.
✓ Scale in minutes
🔮
Future-Proof Your Business
BT is phasing out ISDN by 2027. Switching to VoIP now means you're ahead of the deadline and in control of the timing — rather than being forced to act at the last minute.
✓ ISDN switch-off ready
🇬🇧
UK-Based Expert Support
All providers on this list are supported by authorised UK partners or their own UK teams. Speak to people who know your system — not overseas call centres.
✓ Rated 4.9/5 on Google
Common Questions
VoIP Provider FAQs
Answers to the questions UK small business owners ask most when considering a switch to VoIP.
What is the best VoIP service for small business in the UK?
The best VoIP system for your business depends on your specific requirements, but our experts' current top five are:
- Gamma Horizon — 9.7/10 (best all-round, fully managed)
- 3CX — 9.5/10 (most flexible, best for 10+ users)
- Phoneline+ — 9.4/10 (best value for micro-businesses)
- bOnline — 9.0/10 (best direct provider)
- Lily Comms — 8.5/10 (strong feature set, good track record)
What is a VoIP phone service and how does it work?
VoIP stands for Voice over Internet Protocol — a technical way of saying telephone calls that take place over the internet rather than traditional copper phone lines. Instead of connecting to a public branch exchange, all call management happens online via a cloud-hosted system. As long as your device is connected to the internet, you can make and receive business calls from anywhere.
Is VoIP good for small businesses?
Yes — in our view, it's a game-changer. Cloud-hosted VoIP gives small businesses access to enterprise-grade technology for a low monthly cost. Similarly to cloud tools like Microsoft 365 or Dropbox, it levels the playing field, allowing even a two-person business to present a professional image, access advanced call management features, and work flexibly from anywhere.
How much does a VoIP system cost for a small business?
VoIP costs vary by provider and requirements. If you only need softphones (calls via your laptop or mobile) and are happy with new numbers, costs start from as little as £7.95 per user per month. If you want IP desk phones, headsets, and number porting, the price will be higher. Most providers charge on a per-user per-month basis — there's no expensive hardware to finance, and free call bundles are typically included.
Can I keep my existing business phone number?
Yes. This is called number porting and all providers on our list support it. Whether you have a 01, 02, 03, or 0800 number, it can be transferred to your new VoIP system. The porting process is handled by us or your provider and your calls continue as normal throughout. If you move to Phoneline+, number transfer is even included for free.
What do I need to make VoIP calls — do I need new hardware?
Very little is required. Most small businesses run entirely on softphone apps — meaning your team uses their existing mobile phones or laptops at zero hardware cost. If you prefer physical desk phones, compatible IP handsets are available and often significantly cheaper than traditional ISDN hardware. All you truly need is a reliable internet connection and a VoIP provider.
What are the disadvantages of VoIP?
The main considerations are: (1) VoIP requires a reliable internet connection — if your broadband is unstable, call quality can suffer. We typically recommend a dedicated connection for calls in an office environment. (2) In a power outage, desk phones won't work — though your mobile apps will still function. Neither of these is an insurmountable problem, and automatic failover options are available to mitigate both risks.
Is VoIP cheaper than a traditional landline?
Yes — significantly so. VoIP eliminates line rental costs, reduces per-minute call charges, removes the need for on-site PBX hardware, and most plans include generous free call bundles. UK businesses switching from ISDN to VoIP typically save up to 65% on their monthly telecoms spend. BT is also phasing out ISDN by 2027, so the savings will only become more pronounced as legacy infrastructure is retired.
What are the most useful VoIP features for small businesses?
Based on our customers' feedback, the most valued features are:
- Auto-attendant — route calls professionally without a receptionist
- Hunt groups — ring multiple team members simultaneously
- Call park — put a call on hold and pick it up on another device
- Voicemail to email — receive voicemails as audio files in your inbox
- Call recording — essential for compliance and staff training
- One number anywhere — take your business number wherever you go
- CLI flexibility — dial out on different numbers for different departments
What is the 2027 BT ISDN switch-off and should I be worried?
BT is permanently retiring its PSTN and ISDN telephone network by January 2027. Any business still relying on a traditional landline will lose service. The good news is that switching to VoIP now puts you in control — you choose the right system at a time that suits you, rather than being forced to act at the last minute. Every provider on our list is fully compliant and ready for the switch-off.
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Our experts will match you with the best VoIP providers for your business. No salespeople, no jargon, no obligation — just honest, UK-based advice.
★★★★★ Rated 4.9 on Google
✓ UK-Based Support
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Rated 4.9 on
