Best UK VoIP providers: 2025 buyer’s guide for businesses
Thinking about switching to VoIP? You’re not alone.
With the UK’s old landline network shutting down by 2027, thousands of businesses are moving to internet-based phone systems.
The good news? VoIP is cheaper, more flexible, and packed with features.
In this guide, we’ll break down the best UK VoIP providers, what real users think, and how to choose the right one for your business.
What is a VoIP phone system?
VoIP stands for Voice over Internet Protocol. Instead of using old-school copper phone lines, it sends your calls over the internet. That means you can take calls on a desk phone, laptop, or mobile — all without being tied to a fixed line.
It works a lot like WhatsApp or Zoom calling, but with the extra features businesses need, like call routing, virtual numbers, voicemail-to-email, and lots more.
Key benefits for UK businesses
Switching to VoIP isn’t just about keeping up with tech. It genuinely makes life easier. You can:
- Take and manage calls from anywhere
- Add or remove users as your team grows
- Cut your phone bills by a fair chunk
- Get clearer call quality (with good broadband)
- Plug it into your CRM or helpdesk to see customer info instantly
For smaller teams or growing businesses, that kind of flexibility is a big win.
The PSTN switch-off: Why it matters now
BT is turning off the UK’s traditional phone network (PSTN) in 2027. That means all landline services — including phone systems, fax machines, even some alarm lines — will stop working unless they’re upgraded.
Waiting too long could leave your business scrambling. The smarter move? Switch now, so you’ve got time to plan, test, and take advantage of modern features long before the deadline hits.
What makes a VoIP provider “the best” in the UK?
Not all VoIP providers are created equal. Some focus on big corporate setups. Others keep things simple for smaller teams.
To find the right fit, here’s what UK businesses should be looking at:
- Call quality: Clear audio matters. Look for providers that offer reliable service with low latency and jitter.
- Support: Is their support team UK-based? Are they quick to pick up the phone when something breaks?
- Integrations: Can it link with your CRM, helpdesk or Microsoft Teams setup?
- Pricing: Watch for hidden charges. Good providers keep their plans flexible and upfront.
- Compliance: GDPR compliance is a must. Bonus points if they follow Ofcom’s VoIP best practices.
Must-have features to look for
A good VoIP system should do more than just make calls. Look out for:
- Smart call routing – Send calls to the right person or team, based on time or caller type
- Mobile and desktop apps – Make and receive calls wherever you are
- Voicemail-to-email – Get voicemails as audio files straight to your inbox
- Call recording and analytics – Keep track of conversations and team performance
- Number porting – Keep your current number when switching
- Something else – review these
Even small teams can benefit from these — especially when customers expect fast, professional service.
Best UK VoIP providers for 2025
We’ve handpicked the top VoIP providers in the UK based on three key factors:
- Real-world user reviews from UK businesses
- Feature set and value for money
- Customer support quality, especially for small and medium-sized teams.
Every provider on this list has something different to offer — whether you’re looking for simple setup, advanced integrations, or full unified comms.
Let’s break them down.
1. B4BC: Best value for small and medium-sized UK businesses
B4BC (Best 4 Business Communications) is an independent UK telecoms provider offering hosted VoIP phone systems, broadband, and mobile packages.
Everything is designed with small and medium-sized businesses in mind, so you’re not paying for features you don’t need or stuck navigating bloated dashboards.
What really sets us apart? It’s our customer support. You get proper UK-based support from people who actually answer the phone, and who’ll walk you through setup step by step.
If you don’t believe us, check out our Google Reviews…we’ve got over 350 5-star reviews!
Below are some of the things our 2000+ customers love about us:
1. All-in-one communication hub
Rather than juggling separate providers for calls, broadband, and mobiles, B4BC brings everything together in one place. That means fewer bills, less admin, and one support team for everything — making it a great fit for growing UK businesses.
2. Mobile and desktop app
Take calls on the go or at your desk with easy-to-use apps for iOS, Android, Windows, and Mac. It’s ideal for remote teams, hybrid setups, or anyone who doesn’t want to be chained to a landline.
3. Create a local number, wherever you are
Want a London number while working from Leeds? Or a Manchester line while your HQ is in Birmingham? B4BC lets you choose your local area code, so you can create a presence wherever your customers are.
4. Plug into your CRM
B4BC integrates with popular CRMs and contact centre tools, so your team can see caller info instantly, track interactions, and work more efficiently — without switching between platforms.
Other key features
- 24/7 UK-based support with no long hold times
- 99.999% uptime with built-in disaster recovery
- Smart call routing and voicemail-to-email
- Lower average monthly bills compared to traditional providers
- Quick and easy setup, you’ll be ready to go in minutes
What users say
“I have used B4BC for almost 6 years now with my existing business & when it came to setting up my broadband / phone provisions for a new business I went straight to B4BC. These guys have exceptional customer service & take all the stress off your plate so you can focus on the million other things you need to take care of within your business. Could not recommend any higher!” — Verified Google Review
Our verdict
We might be a bit biased, but we genuinely think we’re the best UK VoIP provider for SMBs. Especially if you like clear pricing, proper UK support, and people who actually pick up the phone.
Get in touch and judge for yourself.
2. RingCentral UK: Best for scaling enterprises with global teams
RingCentral is one of the longest-standing names in the hosted VoIP space. With that comes a solid reputation for reliability and a wide customer base. It’s especially popular with larger organisations looking for a unified solution that brings voice, messaging, and video together under one roof.
The platform also integrates well with major tools like Microsoft 365 and Google Workspace, helping businesses streamline how they communicate and collaborate. If you’re comfortable with a bit of DIY setup, you can even purchase your own phones and get the system running fairly quickly.
But the experience isn’t perfect across the board. Users frequently report frustrating experiences with customer support, from slow resolution times to unhelpful reps.
Pricing is another sticking point. Some businesses say they’ve been locked into long-term contracts with little room to move, even when the service didn’t meet expectations.
There are also complaints around call queue limitations and PBX configurations, which can be tricky for teams with more specific requirements.
Key features
- Trusted VoIP provider with global scale
- Top-rated mobile app for cross-device calling
- Voice, video, and team messaging all in one platform
- Integrates with Google Workspace, Microsoft 365, and more
- Scalable for growing and multi-site businesses
What users say
“We have been using RingCentral for a couple years, its reliable, easy to navigate, very user friendly.” — Trustpilot review
Our verdict
RingCentral has the infrastructure and integrations to support larger, fast-growing teams — especially those with remote or international staff. Just be sure to read the fine print on contracts and understand the support model. If you’re looking for a more flexible, hands-on experience from day one, a UK-first provider like B4BC might be the safer bet.
3. 8×8: Best for call centres and analytics-led teams
8×8 is a well-established name in the VoIP space and offers a broad feature set aimed at contact centres and larger teams. Once set up, the platform is generally stable, with some users reporting long periods without any major outages. It also supports the use of both softphones and desk phones on the same number, which is handy for hybrid teams.
Integration options are available too, though results can vary depending on your setup.
It’s clear that 8×8 is designed for businesses with more complex needs — but with that complexity comes a steeper learning curve.
Some users find the admin portal clunky, and advanced hardware features can feel over-engineered or difficult to configure.
There are also recurring complaints around support. Users report slow response times and a lack of proactive communication when things go wrong.
Service outages and inconsistent call quality are another sticking point for some, particularly in environments where reliability is critical.
Key features
- Competitive pricing for larger businesses
- Softphone and desk phone compatibility on the same line
- Live analytics and call monitoring tools
- Integrations with CRMs and productivity platforms
- Scalable plans for multi-site or remote teams
What users say
“I’ve been using 8×8 for our business communication needs, and I couldn’t be happier with their service! The system is reliable, easy to use, and offers a range of features that help streamline our operations.” — GetVoip review
Our verdict
8×8 offers strong features for call-heavy teams that need detailed reporting and flexible hardware setups. But for smaller businesses or those that want more hands-on support and a smoother setup, providers like B4BC might deliver a simpler, more reliable experience.
4. Vonage UK: Best for developers and custom workflows
Vonage is a flexible VoIP option that works well across multiple devices — including mobiles, desktops, and IP desk phones — which makes it a handy choice for teams working across locations.
It’s often recommended for home or residential use, thanks to its simple setup and user-friendly features. While it’s capable of handling business needs, it seems to suit medium to large organisations best, where its more advanced tools and enterprise features can be put to good use.
That said, smaller businesses might find the experience a little more frustrating.
Common complaints include slow or unhelpful customer service, billing headaches, and issues like SMS glitches or dropped calls. Some users also flag that the costs can be higher than expected, especially when compared to more competitively priced UK-first providers.
And if you’re expecting a smooth refund process? A few reviews suggest it can be anything but.
Key features
- Programmable call routing and APIs
- Global calling options and number porting
- Integrates with major CRM and helpdesk tools
- Mobile and desktop apps
- Virtual receptionist and call forwarding features
What users say
“We recently purchased a Yealink AX 83H phone and needed some assistance with the initial set up. Ange was fantastic and very patient! Thank you very much.” — Trustpilot review
Our verdict
Vonage has plenty to offer, especially if you’re running a larger team and need flexibility across multiple devices. But for smaller businesses, the support and pricing might leave you wanting more. If you’re after more responsive service or simpler billing, a UK-based provider like B4BC could feel like a breath of fresh air.
5. BT Cloud Voice: Best for businesses already using BT services
BT Cloud Voice is BT’s hosted VoIP solution, built on the Broadworks platform — which many users describe as stable and reliable. While it’s effectively a white-labelled version of RingCentral, it’s designed to plug neatly into BT’s wider ecosystem of broadband and mobile services.
One major benefit is that it works over any broadband provider with sufficient bandwidth, giving businesses some flexibility if they ever want to switch ISPs. Just bear in mind that BT’s support may stop at the broadband boundary — if you leave their network, you might be on your own when it comes to troubleshooting.
On the reliability front, users managing larger deployments (with 200+ extensions, in some cases) say the platform holds up well overall. But there are sticking points.
Some report issues with Webex integration — like needing separate login details and no single sign-on — which adds unnecessary admin. A
nd while some BT customers are happy with the service, others describe their support experience as underwhelming, especially when things go wrong. In a few cases, the feedback is harsher, with users recommending others port their numbers elsewhere.
Key features
- Works across any broadband provider (with caveats)
- Based on the stable Broadworks platform
- Voicemail, auto attendant, and call forwarding features
- Optional integration with Webex for collaboration
- Nationwide availability via BT’s own infrastructure
What users say
“I’ve been using BT Cloud Phone for my small business for the past year, and it has significantly streamlined our communication processes. The cloud-based system offers a range of features that have improved our connectivity and productivity.” — G2 Review
Our verdict
BT Cloud Voice does the basics well and makes sense if you’re already deep in the BT ecosystem. But if you value hands-on support, smoother integrations, or a more modern interface, other providers — especially those built for small business needs, like B4BC — might offer a more polished experience.
6. bOnline: Best for micro-businesses on a budget
bOnline is a popular choice for small businesses and sole traders looking for a simple, affordable VoIP setup. It’s often praised for its competitive pricing, making it ideal if you’re trying to cut down monthly costs without missing out on key features.
Users also appreciate how feature-rich the platform is for the price. But there are a few areas where users have voiced frustrations.
Some have reported dips in reliability, such as missed call notifications or delayed messages. Porting numbers over can also take longer than expected, which isn’t ideal if you’re trying to avoid downtime.
And while bOnline does try to manage spam and nuisance calls, it lacks the advanced caller ID tools offered by some bigger-name providers.
Key features
- Competitive pricing tailored to small business needs
- Voicemail-to-email, call recording, and call menus
- Zapier integration for workflow automation
- Quick setup with minimal hardware required
- Active community support and responsive staff
What users say
“bOnline provides an excellent solution for StartUps, which I wasn’t aware of being available to me. The user experience was excellent and they showed genuine interest in my business needs.” — Trustpilot review
Our verdict
For startups and micro-businesses watching their budgets, bOnline is a strong contender. You’ll get plenty of features for the price, and it’s clear the team is trying to improve based on user feedback.
Just be aware it’s not always the fastest when it comes to porting numbers. And reliability can occasionally wobble compared to more established UK-first providers like B4BC.
7. Dialpad: Best for modern remote and hybrid teams
Dialpad is designed for teams that work across devices and platforms — whether you’re using iOS, Android, Windows, or Mac. Setup is quick, especially on mobile, and the system integrates easily with tools like Microsoft 365.
The platform is packed with features too, including voice-to-text transcription, call recording, and handy cross-platform apps.
Many users appreciate how simple it is to get up and running, and the flexibility to use it with SIP phones or less conventional devices like tablets is a plus.
But there are trade-offs.
Customer support is a common complaint. Mmost help is handled through chat, which can feel slow and impersonal when you need quick answers. Some users also report reliability issues like dropped calls and occasional service interruptions, which is far from ideal in a customer-facing environment.
There are also a few quirks that frustrate users, such as a clunky SMS interface on mobile, confusing billing processes, and limitations around scaling the platform for larger, multi-site teams.
Key features
- Quick, mobile-friendly setup with apps for all major platforms
- Voice-to-text transcription and real-time call summaries
- Integrations with Microsoft 365 and Google Workspace
- Supports SIP phones and alternative device setups
- Smart features like call recording and live coaching tools
What users say
“Feature rich VoIP solution for our business. It is very easy to manage online and can access phone and messaging features from anywhere – desk phone, cell phone, laptop. Been using Dialpad for a few years now for both VoIP and conference call solutions.” — G2 review
Our verdict
Dialpad nails ease of use and smart features, especially for small, remote teams who want to get set up fast. But if you rely on phone support or need rock-solid reliability day-to-day, you might find some of the service gaps frustrating — especially compared to more hands-on UK providers like B4BC.
What to ask a VoIP provider before signing a contract
By now, you’ve seen how different each provider can be, from pricing and features to how they handle support and setup. But before you commit to anything, it’s worth digging a little deeper.
Choosing the right VoIP partner isn’t just about ticking boxes. It’s about finding a service that fits the way your business actually runs — and will keep up as you grow.
Here are the key questions to ask any provider, plus the reason each one really matters:
1. Do you offer UK-based support, and what are your response times?
When something goes wrong (and eventually, something will), you want quick answers from someone who understands your setup. Not a chatbot or a call centre halfway across the world. Ask if support is in-house and UK-based, and check their average response time.
2. What’s included in the quoted price — and what isn’t?
Some providers offer low entry pricing but charge extra for essentials like call recording, voicemail, number porting, or even support. Get a full breakdown upfront so you don’t get stung later.
3. How flexible are your contracts and plans?
Business needs change. You might grow, downsize, or switch location. Look for providers who offer flexible contracts and allow you to scale your number of users up or down without penalty.
4. What backup options are in place if the internet goes down?
VoIP relies on your broadband connection — and if that fails, so do your calls. Ask whether the provider offers mobile app failover, battery-powered units, or call forwarding to mobiles during outages.
5. Are your systems GDPR compliant, and do you follow Ofcom’s VoIP guidance?
If you’re handling customer data over the phone, GDPR compliance isn’t optional. Plus, Ofcom regulates how VoIP should be offered in the UK — so providers following those standards are more likely to be trustworthy.
6. Can the system integrate with my CRM, helpdesk, or productivity tools?
The more your phone system talks to the tools your team already uses, the better. It can save time, give you call context, and improve customer service.
7. What’s your typical onboarding and setup process like?
Some providers will plug you in and leave you to figure it out. Others will help configure everything for your team. Ask how much support you’ll get in the early days, and whether they handle number porting, device setup, or training.
These questions will help you uncover which one will actually work for your business, day in and day out.
Which is the best UK VoIP provider?
There are loads of VoIP options out there. But not all of them are built with UK businesses in mind. Some are packed with features you’ll never use. Others might leave you waiting days for support.
At B4BC, we keep things simple. You get crystal-clear call quality, proper UK-based support, and honest pricing with no sneaky extras. Whether you’re a team of 3 or 300, we’ll help you build a phone system that fits — and grows with you.
We’re happy to talk you through your options, give honest advice, and show you how it all works.
Get in touch today and we’ll show you why we’re one of the best UK VoIP providers in the market today.
