The 6 best VoIP providers for UK small businesses in 2025

Our in-house research team has worked rigorously to determine the best Voice over Internet Protocol (VoIP) providers in the UK. Analysis of eight popular providers led to us choose bOnline’s Unlimited Calling package as the best VoIP service for small businesses, thanks to its excellent value for money and fast and easy setup.

Discover why bOnline is our leading VoIP recommendation for all-round performance.

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By 2027, the Public Switched Telephone Network (PSTN) is due to be switched off, and all businesses will need to move to a VoIP-based provider. That’s why we’ve selected each provider’s best plan for small businesses, so you can compare the right options for you straight away, with our choices based on the budgets and needs of SMEs.

If you’d like to compare full systems, including compatible phones, visit our page for the best small business telephone systems.

The best VoIP providers: comparison table

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	Provider	Best for	Pricing from
BEST ALL ROUND
bOnline	RingCentral	Dialpad	GoTo	Google Voice	NBC Cloud Voice
A budget-friendly VoIP provider	Improving customer service	Small customer service teams	Multiple locations	Google Workspace users	Call centres who need unlimited minutes
£7/user/month	£12.99/user/month (paid annually)	£12/user/month (paid annually)	Bespoke	$10/user/month (Google Voice is only priced in US dollars)	£9.99/user/month
Get Quotes	Get Quotes	Get Quotes	Get Quotes	Get Quotes	Get Quotes

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Video: what you need to know about the top VoIP providers

Short on time? Watch our Reviews Writer explain our favourite VoIP options in just three minutes:

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1. bOnline: best budget-friendly VoIP provider

Recommended plan: Unlimited Calling

bOnline

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• Starting price from: £7/user/month

• Unlimited Calling plan is good for startups doing lots of cold calling
• Great for new businesses who need lots of features for a small cost
• Low cost starter plan is solid option for micro-businesses

Summary bOnline is a UK-based telecommunications company that specialises in providing solutions specifically with a small business marketplace in mind. With a focus in low-cost, easy solutions, bOnline make the claim to be "the most awarded business VoIP phone for UK businesses with one-to-five employees".

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Why is bOnline a top provider?

We chose bOnline as our best business VoIP provider because of its excellent value for money: alongside unlimited UK calls, it provides big features at a small price.

It’s also a great option if you’re looking for a first-time VoIP system. It’s fast and easy to set up, taking around two minutes, and it needs no engineering or installation fees.

How much does bOnline cost?

The Unlimited Calling plan provides exactly what its name promises. There’s currently a promo where you can get the first six months for just £9.95 + VAT per user, per month (on a 12-month contract).

Considering you get unlimited UK mobile and landline calls, as well as 45 calling features as part of the package, that’s pretty unbeatable value.

What are bOnline Unlimited Calling’s key features?

We’ve highlighted the crucial features you’ll get with bOnline Unlimited Calling below:

What are bOnline Unlimited Calling’s downsides?

Bear in mind that bOnline lacks the advanced security layers the other providers offer, as it doesn’t provide multi-factor authentication. If your business is particularly security conscious, Google Voice might be a better option for you.

What security features does bOnline Unlimited Calling have?

It’s missing multi-factor authentication, but bOnline does let you create password rules and set up admin permissions.

What software can I use with bOnline Unlimited Calling?

bOnline connects with popular software including MS Dynamics, Salesforce and HubSpot – but it costs an extra £9 per month to integrate this software with your VoIP plan.

2. RingCentral: best for improving customer satisfaction

Recommended plan: Standard

RingCentral

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• Starting price from: £12.99/user/month

• A range of plans that can suit a wide variety of businesses of different sizes
• Good for growing businesses that need streamlined internal communications
• Great for customer-service focused businesses

Summary Based in California, RingCentral provides cloud-based communication and collaboration products and services, including a cloud-based business phone system. Founded in 1999, it has grown to now serve over 400,000 customers worldwide and is available in 46 countries.

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What makes RingCentral a top provider?

RingCentral is the best VoIP provider for improving customer satisfaction because it combines multiple communication channels, including phone calls, team chats, and WhatsApp, on a single platform. This allows your staff to seamlessly collaborate and gives you the option to contact your customers through their preferred channels.

Our research shows RingCentral provides the strongest user support options, including 24/7 unlimited chat and phone support. So, if you offer all-hours support to your clients, for example, this could be invaluable in an emergency.

How much does RingCentral cost?

The key point you’ll need to factor in: RingCentral is one of the few providers on this list that doesn’t provide unlimited calling at this price level. If unlimited minutes is a must-have then bOnline and Dialpad will be better options for you.

What are RingCentral Standard’s key features?

RingCentral Standard excels in combining sophisticated call management tools with a wide range of communication methods. We’ve provided a highlight of the key features:

What are RingCentral Standard’s downsides?

While RingCentral does provide a decent range of communication options, we would have liked to have seen it include SMS, which Dialpad and GoTo Connect both provide.

What security features does RingCentral Standard have?

RingCentral provides multi-factor authentication, password rules and admin permission settings. It also has a range of compliance certificates, including:

• HIPAA
• SOC 2 and SOC 3
• HITRUST
• Skyhigh Enterprise Ready

What software can I use with RingCentral Standard?

On the standard plan or higher, RingCentral offers a large ecosystem of integrations, covering everything from analytics to AI.

3. Dialpad: best for small customer service teams

Recommended plan: Pro

Dialpad

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• Starting price from: £12/user/month

• Good for small businesses who need help managing high call volumes
• Compatibility with four types of desk phone
• Can integrate with Salesforce, HubSpot and Zendesk

Summary Dialpad is aimed at both small and large companies, and is using communications AI to provide unified products. It has a global reach, with 11 offices around the world, and serves 30,000 customers, including big names like Xero.

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Why makes Dialpad a top provider?

Dialpad Pro offers a full package of call management features that can help small to medium customer service teams seamlessly handle high numbers of calls.

To help your customer service team perform to a high standard, you’ll benefit from features like:

• AI-powered real-time call transcripts
• Quality-of-service reports
• Automatic spam call detection

How much does Dialpad cost?

Dialpad Pro’s price is middle of the range, but alongside GoTo Connect, it offers the strongest call management features on this list.

What are Dialpad Pro’s key features?

Dialpad Pro gives your customer service team everything they need to handle high call volumes and, alongside GoTo Connect, it’s also one of the only providers on this list to include SMS messaging. Here’s a breakdown of the key features:

What are Dialpad Pro’s downsides?

The big thing to keep in mind is that the maximum number of participants that are supported on a video call is 10. So, if you’re planning on hosting video calls with large teams, we’d recommend looking at NBC or bOnline instead.

What security features does Dialpad Pro have?

Alongside multi-factor authentication, password rules and admin permissions, Dialpad also boasts a range of compliance certifications, which include:

• SOC 2
• HIPAA
• GDPR
• CSA
• ISO 27001; 27017; 27018

What software can I use with Dialpad Pro?

Dialpad Pro integrates with a solid range of big name software, such as Google Workspace, Microsoft 365, Zendesk, Slack, Salesforce and others.

But, if you’re using more niche software, RingCentral will be more likely to have the integration you need.

4. GoTo Connect: best for companies with multiple locations

Suggested plan: Phone System 

GoTo Connect

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• Starting price from: Quote-based

• Good for medium-sized businesses to unify their communications
• Helps communication between businesses in different locations
• Compatible with over five brands of desk phone

Summary Based in Boston, Massachusetts, GoTo is a software as a service company that launched its cloud-based phone system and customer engagement software, GoTo Connect, in 2022.

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Why makes GoTo Connect a top provider?

GoTo Connect provides an impressive suite of call management features, as well as AI tools like meeting summaries, which we recommend as being best suited to a more medium-sized operation.

The smart call routing and ring groups can help your staff and customers get hold of colleagues who are based in separate offices, quickly. Another standout feature is the international calling: you can make and receive calls from over 50 countries for free.

How much does GoTo Connect cost?

Rather than set pricing, GoTo Connect will work out a bespoke quote for you. Our tip would be to contrast this against the pricing we’ve provided for competitors, to get an idea of the value for money GoTo Connect is offering.

What are GoTo Connect Phone System’s key features?

GoTo Connect provides the widest range of communication channels out of the providers we analysed, and you can find a breakdown of the key features in the table below:

What are GoTo Connect Phone System’s downsides?

The only major downside is that you’re limited to 1,000 free minutes per month, which are shared across all your users. If having unlimited domestic minutes is a must-have for you, jump down to NBC Cloud Voice instead.

What security features does GoTo Connect Phone System have?

GoTo can give you peace of mind with multi-factor authentication, password rules and admin permissions, as well as compliance certifications including:

• SOC 2
• GDPR
• CCPA
• HIPAA
• APEC CBPR

What software can I use with GoTo Connect Phone System?

GoTo MarketPlace is the designated integrations store, where you can find programmes like Zapier, Slack, Salesforce and HubSpot. More technically advanced operations can use GoTo’s development centre to build their own APIs.

5. Google Voice: best for Google Workspace users

Recommended plan: Standard

Google Voice

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• Starting price from: $10/user/month (Google Voice pricing is only provided in US dollars)

• A low-cost option for Google Workspace users
• Solid spam prevention tools
• Free calls to the US

Summary Google Voice is a VoIP solution provided by Google that was previously only available in the US. Now businesses in the UK can access Google Voice as a paid add-on to Google Workspace.

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What makes Google Voice a top provider?

If you’re already using Google Workspace day-to-day for your business, then using Google Voice as your VoIP provider is something of a no-brainer. It’ll be simple to integrate into your existing workflow, and you’ll get set up quickly.

You’ll also get access to some pretty impressive security features. It has some powerful spam filtering technology, which can help put a stop to any nuisance calls that are slowing down your staff.

How much does Google Voice cost?

Google Voice’s pricing is only presented in US dollars.

While it might be an easy, low-cost option for Google Workspace users, we wouldn’t recommend signing your business up to Workspace just to use Google Voice as your VoIP provider.

We’ve included Google Workspace’s pricing, so you can work out the total cost:

What are Google Voice Standard’s key features?

Google Voice Standard gives you access to a solid range of features and unlimited domestic minutes at a cost-effective price, including the below:

What are Google Voice Standard’s downsides?

Google Voice is a little less equipped to handle high volumes of calls (it’s missing features like call queues and call flip). This makes it less suitable for customer service teams – Dialpad will be a better option. You should also be aware that some features are only available in the US.

What security features does Google Voice Standard have?

Along with the spam filtering, you’ll get the standard security features of multi-factor authentication, password rules and admin permissions. Google Voice also has a reassuringly stacked list of compliance certifications, including:

• ISO/IEC 27001, 27017, 27018 (Cloud Privacy), 27701 (Privacy)
• SOC 2 and SOC 3 reports
• HIPAA

What software can I use with Google Voice Standard?

This is unfortunately a big blind spot for Google Voice. Outside of a forum answer confirming that Salesforce is compatible, there’s little evidence of the software integrations Google Voice can support.

6. NBC Cloud Voice: best for call centres needing unlimited calls at no extra cost

Recommended plan: Enterprise

NBC Cloud Voice

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• Starting price from: £9.99/user/month

• Low-cost entry level tier for businesses just starting out
• Unlimited calling with the Enterprise and Mobility plans
• Can help small businesses manage large call volumes

Summary National Business Communications is a UK-based telecoms company that is specifically geared towards helping small businesses. Cloud Voice is its VoIP technology and is backed by the BroadSoft solution by Cisco.

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What makes NBC Cloud Voice a top provider?

NBC Cloud Voice’s Enterprise plan provides a solid suite of call management features. It offers almost everything you’ll need to stay on top of high call volumes, including:

• Call queues
• Out-of-house management
• Call flows
• Multi-site support

You also get the option to pay for additional advanced features, like an AI auto-attendant (from £2.99 per month) or call recording (which is an extra £5 per month).

How much does NBC Cloud Voice Enterprise cost?

The Enterprise plan represents one of the more costly mid-tier options, but you do get unlimited UK landline and mobile calls built into the package, and the option for a handset starting at an extra £5 per month.

What are NBC Cloud Voice Enterprise’s key features?

NBC Cloud Voice Enterprise provides a solution to a very common problem amongst SMEs — managing high call volumes without breaking the bank. It does this with over 40 features. We’ve highlighted the key specs below:

What are NBC Cloud Voice Enterprise’s downsides?

The Cloud Voice Enterprise plan only comes with a desktop app, not a mobile app. You only get the Cloud Voice mobile app if you pay for the most expensive plan: Complete Mobility.

So if you’re looking for a more affordable plan that includes a mobile app, we’d recommend bOnline instead.

What security features does NBC Cloud Voice Enterprise have?

One thing to note is that the Call Centre Basic plan doesn’t come with multi-factor authentication, but with the two more expensive plans, you will be able to force users to use authorisation codes when using the software offsite.

You do get password rules and admin permissions on all plans, though, and NBC provides the following compliance certifications:

• ISO 27001
• GDPR

What software can I use with NBC Cloud Voice Enterprise?

NBC Cloud Voice is unfortunately limited when it comes to integrations. The Enterprise plan allows for integration with Microsoft and Google, but that’s about it.

RingCentral is compatible with a much more varied range of software, so if you’re looking to integrate CRM or helpdesk, it’ll be a better provider for your needs.

How do I choose a VoIP provider for my small business?

By January 2027, all traditional landline phones will be replaced by VoIP telephone lines in the Big Switch Off. But different businesses have different needs. Some smaller businesses might just want a simple app-based virtual landline, for example.

You still need to know what to look when comparing the best VoIP providers for business, though. Here are the main factors to consider:

• Step 1. Decide on your “must-haves”: there are basic call features that every business will need (like voicemail), but other tools you should keep in mind are desktop and mobile apps, software integrations to improve workflow, training tools to increase staff efficiency and shorten onboarding time, and strong help and support options.
• Step 2. Decide on a budget: going for the cheapest option isn’t always the best idea. You might need to splash out on more advanced features, like analytics and reporting. Or it may be worth opting for a more expensive plan that includes unlimited minutes.
• Step 3. Think about communication channels: you’ll need to think about both your internal and external communication channels. Is video conferencing a critical part of your day-to-day communications? How do you want to be able to contact your customers?
• Step 4. Consider contract length: running a startup is always a tumultuous prospect, so we’d recommend looking for shorter term contracts. You don’t want to be locked into an agreement that you won’t actually end up using. VoIP providers tend to sell contracts on a 12 or 24-month basis.

Can I port my existing business phone number to a new VoIP service?

Yes, you can port your existing business phone number to your new VoIP service. The system generally works the same way as porting your personal number when you get a new SIM card.

If you’re porting a business mobile phone number, you need to request a PAC code from your mobile provider. Then, just give your new provider the issued PAC code and your mobile number. The provider will take care of the rest and inform you when the transfer is complete.

There are some instances where it might not be possible — for example, if there are geographical restrictions that aren’t supported by your new provider. It will also depend on whether you have a landline or mobile number, as some providers only support mobile number porting.

Just keep in mind that, if your existing business phone account covers multiple numbers, you’ll need to let your new provider know in advance.

Is VoIP easy to set up?

Thankfully, installing a VoIP system is easy, and far simpler than setting up a traditional phone line. This is because your VoIP provider will take care of the bulk of the infrastructure for you, rather than you having to do it in-house.

To get your business VoIP system up and running, follow these steps:

1. Make sure you have a high-speed internet connection. Run a speed test on your network – you’ll need a minimum of 100kbps of upload and download bandwidth per call.
2. If you’ll have multiple users, you may want to configure Quality of Service (QoS) on your router to prioritise your VoIP traffic.
3. Once you’ve selected a VoIP provider, you’ll need to port your existing number (or have one assigned by your provider).
4. Once you’ve connected any phones or headsets, you should test your system before you begin using it. Check for dropped calls, delays and overall sound quality.

You may not need dedicated phones to use a VoIP system, as most come with a softphone app, which allows you to use your VoIP features and make and take calls from mobiles and desktops. This will depend on your specific plan and provider, though, so be sure to check.

If you don’t have a softphone app, you will need IP phones or VoIP-enabled headsets to make and take calls. This will make your setup slightly more complicated, as you’ll need to choose and order your devices. Check whether you can buy them through your VoIP provider, as this will streamline things.

Read next: Essential guide to business telephone and mobile numbers UK

Our methodology

Our dedicated research team conducted a detailed survey to give us a better understanding of our users’ communication needs.

This, alongside our team’s industry expertise, has helped us to identify the eight most important factors small businesses should consider when choosing a VoIP provider:

• Call management: features for handling calls
• Pricing: cost and value for money
• Hardware integrations: the types of phones and devices it can be used with
• Software integrations: what other applications it can be used with
• Communication channels: which other types of communication are provided
• Training features: assistance with onboarding staff
• Security options: the measures in place to protect your sensitive data
• Help and support: the range of support options that are available

Do you want more information on taking calls online and how it works? You can head over to our dedicated article on what VoIP actually is.

In summary: what’s the best VoIP provider?

bOnline is our top recommendation for small businesses looking for the best VoIP provider. Its Unlimited Calling plan manages to combine an array of calling features with unlimited UK landline and mobile calls, while still remaining cost-effective.

However, there could be a provider that makes more sense for your specific workflow. For example, if you’re already using Google Workspace then Google Voice will be a quick and simple solution.