Cheapest VoIP Providers 2025: Top Cheap Phone Plans For UK Businesses

Choosing the cheapest VoIP provider plan should be a crucial consideration for cost-conscious businesses. Thankfully, cloud phone systems are more affordable than ever in 2025 – just in time for the Big Switch Off of UK landlines in 2027.

Below, we’ve ranked our top-rated VoIP providers by how little they require you to pay, with costs starting from just £7 per user per month. We’ve also included other cost considerations you’ll need to factor in, where relevant, such as add-ons and user minimums, and how cheap it is to scale into a provider’s more comprehensive plans as your business grows.

* Google Voice pricing is only available in USD (converted to GBP); you must be a Google Workspace user which costs an additional fee.

1. bOnline Starter: Cheapest VoIP Provider Plan

Of all the VoIP plans we researched, bOnline’s Starter plan is the cheapest for UK businesses at just £7 per user per month. It has zero limits on user numbers and offers streamlined yet robust call management and training features, and potential add-ons should you need them.

That makes it best suited to small businesses and startups that are primarily concerned with achieving low cost and basic functionality, especially businesses establishing their first online phone system where advanced features and scalability are not immediate priorities (especially since the cost of its add-ons mean it won’t be a long-term cheap choice for teams that need them).

Let’s dive into what exactly those add-on costs are, where bOnline Starter impressed us with its value and how it might fall short below.

Pricing correct as of March 2025.

What does bOnline Starter do well?

For the cheapest price on the UK market, bOnline Starter delivers high-definition calling across both desktop software and mobile apps (iOS and Android), with desk phone support and extension dialling by default.

In terms of call management features, it’s a no-frills solution featuring call queues, management for out-of-hours calls, tunes for hold music, call flows, interactive voice response and multi-site support.

While instant team messaging is restricted to its Unlimited Calling plan, communication channels for its Starter package include video and audio conferencing, too. With both the NBC Call Centre Basic and Vonage Express, video calling isn’t included.

It’s also worth noting that while certain add-ons, like CRM integration, cost extra, they are available to add to bOnline Starter plan.

This sort of customisation isn’t possible with most VoIP providers, especially on cheaper plans. For instance, RingCentral requires users to purchase its Premium plan for CRM integrations, which costs between £17.99 (100+ users) and £24.99 (1 user) depending on seat numbers.

Are there any downsides to bOnline Starter?

While bOnline Starter is the cheapest option, its low price may be offset by additional spending elsewhere. It omits several features reserved for the Unlimited Calling plans, such as advanced call management (recording, forwarding, voicemail), collaboration tools (team messaging, video screen sharing) and Microsoft/Google Workspace integrations.

The plan only includes 100 outbound UK minutes per user each month, which might be insufficient for call centres or customer-facing teams, whereas Google Voice has unlimited minutes. To upgrade for unlimited calls and the extra features with bOnline, you’ll pay an extra £6.95 per user/month – albeit, that’s still very competitive at £13.95 per user/month.

Moreover, add-ons like call recording and HD video conferencing (up to 24 participants) cost an extra £5 per month, while CRM integration now costs £9 per month (up from £5 last year), though this now supports over 200 CRMs rather than 20. In total, these extras can add about £19 per month. Still, add-ons may be preferable to upgrading entire plans, as discussed above regarding RingCentral.

Additional drawbacks include compatibility only with Yealink phones, which might require purchasing new hardware (its Unlimited Calling plan does include hardware for £15.50 per user/month). By comparison, RingCentral and Vonage connect with more phone brands including Alcatel, Cisco, and Mitel for the former and Grandstream, Poly and Algo for the latter respectively.

Plus, it lacks multi-factor authentication compared to more secure providers like Google Voice and has limited customer service hours (Monday to Friday from 9am to 6pm and Saturday from 10 AM to 2 PM). By comparison, RingCentral Essentials offers immediate attention for all your queries via its 24/7 helplines, which may suit those new to VoIP a little better.

2. Google Voice Starter: Cheapest VoIP Plan For Unlimited Calling

For users already invested in Google’s ecosystem, or want to connect their VoIP to its online workspace, Google Voice is an obvious choice. You need a Google Workspace subscription to use Google Voice, so it’s simply a must.

But even if you aren’t that fussed about using Google tools, Google Voice’s unlimited calling within the UK and to Canada and the US at no extra cost is a major perk that most cheap VoIP plans can’t match (and a great boon for businesses operating across these English-speaking countries). While its calling features aren’t out of this world, there are a few other perks to consider too, depending on your business needs.

*Google Voice pricing structure uses USD ($), however, we have converted these values to British Pounds (£) for ease of comparison. Pricing correct as of March 2025.

What does Google Voice Starter do well?

Being integrated into the Google System for all your operations is incredibly secure. Its international expertise puts it above all the VoIP competition in this area according to our research, with advanced security controls and compliance features.

In short, Google Voice Starter offers some robust call management tools, alongside top-notch security. Its calling features include multi-level auto attendants (not available with bOnline), ring groups, and desk phone/ATA support, allowing for efficient call routing and handling. Unlike all plans on this page, you also get voicemail transcripts and unlimited SMS messages (to local markets).

While bOnline Starter lacks multi-factor authentication, Google Voice secures calls with end-to-end encryption and multiple verification methods for all users too, including strict password rules, fingerprints, SMS codes and/or use of the Google authentication app.

Compared to Vonage Express’s basic telephony and RingCentral Essentials’ broader UCaaS offerings, Google Voice offers a compelling balance for small teams in regulated industries such as healthcare and finance.

Using its software was a pleasure too, with many participants noting how the interface layout and design made complete sense. Finding specific tools was easy to figure out and there are fun customization options, like selecting a profile image for each contact.

Additionally, its Android, iOS, and web applications, coupled with 24/7 support, make it a reliable, cost-effective solution for streamlined call management. And, as discussed above, you’ll have all of Google’s other software tools to use for a fully functioning system.

Are there any downsides to Google Voice Starter?

Depending on your business needs, a potentially major disadvantage to Google Voice is its inherent Google integration. While this brings with it upsides, as explained above, the downside is you cannot integrate any third-party software. Businesses that regularly use CRM tools, or need to integrate any non-Google software, will need to look elsewhere.

Similarly, it has no training features besides call recording and basic analytics (missing out on call monitoring, whisper, and barge functionality). Still, getting only basic coaching tools is the norm for the cheapest plans on the market and Voice Starter’s training suite is still more capable than RingCentral Essentials (the provider reserves all its coaching tools for higher-priced plans).

3. RingCentral Essentials: Best Cheap VoIP For Future Scalability

RingCentral Essentials has a great starting price of £7.99 per user, per month for teams between two and 19 people, offering core call management and collaboration features from voicemail transcription to team messaging.

The Essentials plan is serviceable then, but we’d argue it doesn’t offer as much value for money as bOnline or Google Voice’s cheapest packages since it locks a lot of advanced smarts away in its higher-cost plans.

Still, for businesses after a long-term solution that won’t require them to change providers down the line, its Essentials plan is a great platform to build on. When your business is ready to upgrade, you’ll be treated to the most comprehensive VoIP plan we’ve tested – its Ultimate plan – which is our highest-rated VoIP package overall.

Pricing correct as of March 2025.

What does RingCentral Essentials do well?

While not the cheapest on the market, RingCentral Essential’s pricing is competitive as the third cheapest option on this page and comes with some handy call management features.

That includes a visual voicemail that lets you quickly view and prioritise messages without listening through lengthy recordings. Similarly, its advanced call system administration tools allow you to easily configure call routing and multi-level auto attendants to suit your organisation’s needs. Add in call forwarding, flipping, transferring, parking and screening abilities and it’s a pretty comprehensive suite of features.

Unlike bOnline Starter, you also have team messaging and document sharing to facilitate real-time communication and collaboration (especially since it offers mobile apps for both iOS and Android for staff to use on the go).

Detailed call log reports and pre-built dashboards, including quality-of-service (QoS) metrics, provide further actionable insights to monitor performance and drive improvements over time, too.

Unlike bOnline’s cheapest plan, RingCentral’s lowest-priced Essentials package offers 24/7 customer support as standard, alongside comprehensive implementation and training services. Although, we found RingCentral extremely user-friendly during our user testing, so using its support network may not be necessary.

We’d also consider RingCentral, as an overall provider rather than this specific plan, the best choice for long-term scalability. We found its higher-cost Ultimate plan to be more comprehensive than any other similarly priced buy, earning it top-spot on our Best VoIP Providers roundup. So when your business is willing to spend a little extra rather than purchase this Essentials plan, you’ll be treated to the widest range of features we’ve found full stop.

Are there any downsides to RingCentral Essentials?

As alluded to, RingCentral Essentials isn’t our favourite choice when balancing cost and functionality.

For its cost, you only get 100 outbound minutes per user, like bOnline Starter, making Google Voice Starter the better choice for active staff calling teams or contact centres. Notably, you also have zero inbound minutes included, making RingCentral Essentials the worst choice for customer service teams of the cheap plans reviewed on this page.

Like Google Voice Starter, you won’t get any software integrations either, since you need to pay for at least the Standard plan (£19.99/user/month). Meanwhile, you’ll need RingCentral Premium (£24.99/user/month) to use CRM integrations with Salesforce and Zendesk, amongst others, or coaching features like call barge or whisper functions.

4. NBC Call Centre Basic: Cheapest VoIP For Larger Call Centres

NBC Call Centre Basic is our pick for a cost-effective solution for medium to large call centres primarily because of its user minimums: you need to have at least 25 users to be eligible for this plan.

If that sounds like your team, then you’re able to get its Call Centre Basic plan for the appealing price of £9.99 per user, per month. In return, you’ll get more call centre-friendly features than most cheap VoIP plans including call routing, queue management, and simple IVR functionality.

Pricing correct as of March 2025

What does NBC Call Centre Basic do well?

NBC’s cheapest plan Call Centre Basic costs a reasonable £10 per user, per month – roughly the same as Vonage Express. Since RingCentral Essentials and Google Voice Starter have user limits of 19 and 10 respectively, larger teams after a cheap solution can only pick between this package, bOnline Starter and Vonage Express.

Like other providers on this page, it offers fairly basic features you need for call management, including HD voice calls, extension dialling, holding (with hold music), call forwarding, voicemail and voicemail to email. Although, some of those features aren’t to be taken for granted – for instance, only Vonage Express also includes voicemail-to-email functionality.

Are there any downsides to NBC Call Centre Basic?

Unlike bOnline’s cheapest plan, you don’t get call routing on Call Centre Basic. Meanwhile, Google Voice’s Starter plan has many more features for a similar cost too, including multi-level auto attendant, ring groups, and text messaging records.

Other call management features, such as call queues and hunt groups, plus other communication channels including video/audio conferencing and team messaging, are only part of its Enterprise plan (£18/user/month) and above.

Elsewhere, you’ll need to pay between £2 and £5 per month each for call recording and storage, an AI auto-attendant, calling international numbers or its own-brand handsets.

Meanwhile, no matter which NBC plan you choose, there are no CRM integrations to speak of, nor any training features. If you think your business will need them in the future, you will have to change providers to achieve it. Accordingly, RingCentral is a better choice for the long term.

5. Vonage Express: Best Cheap VoIP For Calling Features

Vonage’s low entry price and comprehensive set of calling features as part of its entry-level plan make it an attractive low-cost telephone line for many small businesses.

While it isn’t as cheap as other VoIP providers, it does have greater scope for scaling up in the future, as Vonage has some of the most comprehensive features going (second only to RingCentral from options on this page).

Pricing correct as of March 2025.

What does Vonage Express do well?

Costing £10 per user per month, Vonage Express (its cheapest plan) has a nearly identical cost to NBC and Google Voice’s cheapest packages. Although it’s £3 per user, per month more expensive than bOnline’s cheapest offering, we think it’s still solid value for money.

For that price, you’ll get use of a desktop and mobile app with over 30 calling features to use on a metered calling allowance. Those features include call reporting, screening, holding (with music on hold), parking, waiting, flipping, forwarding and blocking, plus voicemail to email.

Each user has a dynamic, local caller ID and can be tagged by other users into a call. While, you’ve also got a dashboard with basic analytics and call logs, plus an admin portal to set user permissions. Like RingCentral Essentials, Vonage’s team messaging is built into its VBC mobile and desktop apps so your team can keep in touch with one another instantly, which not all cheap plans discussed here offer.

That’s a lot of functionality for a provider’s lowest-priced plan which we’d argue sets Vonage Express up as the best cheap plan for calling features overall.

Are there any drawbacks to Vonage Express?

While the Express plan might have the best calling features of these cheap options, like RingCentral, some of Vonage’s more advanced features are locked away at a higher price point.

Call management tools for recording, monitoring, queuing, groups and receptionist features only come into play in its Pro plan (£20 per user, per month) too. Meanwhile, you can only get CRM integrations on its Max plan (£25 per user, per month).

Similarly, Vonage Meetings (its audio/video conferencing tools) and the use of a virtual receptionist, are only available on the Core plan (£18 per user, per month) and up. Only Google Voice allows for video conferencing out of all these cheap plans, but that’s down to the inclusion of Google Workspace which takes its overall price (~£13.83) to above that of Vonage Express anyway.

All this might deter small businesses looking to integrate their communication systems more fully with other business operations, potentially limiting its overall value for those needing more than basic call functionality – particularly since you need a minimum of five users.

How To Choose the Best Cheap VoIP Provider for Your Business

Above all, price is often the determining factor for businesses. As such, when picking the best VoIP for your needs, you need to consider the bottom line cost (or, the best value option for your specific business needs). This requires you to consider several different features:

1. Pricing Structures

Compare the pricing plans offered by different providers. We recommend you look beyond the initial cost per user and consider any additional fees for setup, equipment, or extra features that you require.

For instance, many of the providers we listed here either require additional payment or for your business to opt for a slightly higher-priced package for specific features, such as call recording or video conferencing.

2. Contract Terms and Lengths

It’s also worth considering how long you want to commit to a specific VoIP provider. Some providers may offer discounts for annual contracts, or three-year commitments in some instances.

We also recommend reviewing the terms of any contracts carefully, as you may find cancellation policies and contract renewal terms that bring unexpected costs in the future.

3. Trial Periods

Long contracts might not be preferential for a business looking to cut costs in the short-term, or for a first-time VoIP business looking to see what features work for them. However, you can often make use of free trial periods to check if a service is right for you.

Some VoIP providers offer money-back guarantees, too, if the trial is too limiting for your business needs.

4. Scalability, Integration and Compatability

Choosing one VoIP provider that could meet all your future business needs down the line, rather than chopping and changing your plans as required, can sometimes keep costs lower.

This is because you won’t have any of the costs of changing providers, such as any changeover fees, costs of adapting and integrating existing hardware or software with a specific VoIP, or losses in efficiency when you and your staff need to learn your VoIP system.

So, if a provider offers flexible plans or add-on features to accommodate an increasing number of users or additional functionalities as your business expands, it can be both an easier and more cost-effective solution for the long term.

Of course, this only applies to businesses that may need greater functionality in the future, with tools for CRM integration, analytics or advanced calling tools often reserved for higher price tags.

If your business isn’t likely to require any further tools down the line, sticking with the cheapest plan around shouldn’t pose any problems.

5. Features

Of course, price interacts with what features you need. Basic features like call forwarding, voicemail-to-email transcription, and mobile integration should come as standard.

However, as mentioned, many providers restrict their advanced features such as video conferencing, CRM integration, and call analytics, for certain plans. So, it’s worth considering what plan offers the best value for the functionality you need.

6. Customer Support

Quality customer support is crucial for resolving issues promptly as and when they arise. Look for providers that offer 24/7 support and multiple channels of communication such as phone, email, and live chat.

7. Security and Compliance

Since VoIP systems tend to handle sensitive business communications, robust security measures are essential – especially in certain sectors, such as healthcare. Verify that the provider implements encryption protocols and compliance with industry standards such as GDPR or HIPAA, depending on your business’s requirements.

How Did We Find The Cheapest VoIP Providers in the UK?

To find the cheapest VoIP providers in the UK, we took our top-ranked VoIP services and simply found the lowest-priced plans that they offer.

From there, we compared each of them against one another, looking at how much value you get for that low price (as often, the cheapest VoIP plans are somewhat limited compared to the higher priced and fully-fleshed out plans it offers). Some of these assessment areas include:

Our main testing categories for VoIP products and services are:

• Call Management Features – the software’s capabilities for streamlining incoming calls. VoIP-using organisations often deal with high call volumes. They rely on call management features to create a better experience for these callers.
• Software Integrations – the extent of the software’s compatibility with other business applications. VoIP software is often used with customer-data applications and other communication technologies in order to increase operational efficiency.
• Communication Channels – the other communication methods supported beyond voice calling. VoIP is often purchased to streamline communication into one application rather than separate.
• Training Features – the software’s capabilities for supporting employee training initiatives. VoIP-using businesses often train their employees on telephone etiquette.
• Hardware Integrations – the software’s compatibility with different devices. VoIP software is often used with standalone hardware.
• Customer Support – the accessibility and convenience of customer service channels offered by the VoIP provider.
• Security Options – the software’s security features to protect calls and data. Organisations can be put at risk if sensitive information is leaked due to a breach of security.
• Pricing Factors – the software’s pricing structure and cost-effectiveness. For this page, we ranked providers purely on their per user cost, but we’ve also assessed the value of these plans in the reviews above.

Where possible, we’ve also completed usability testing for VoIP services that we could get hands-on with. Testers put VoIP software through its paces to assess how well each could complete certain prescribed tasks.