The Best VoIP Providers 2026

This guide ranks the best UK business VoIP providers for 2026, with real pricing, specs, and honest pros and cons for each. We've also covered the practical questions that come up once you've shortlisted a provider and how VoIP sits alongside your business broadband.

TLDR: RingCentral is the strongest overall choice for UK businesses that want one platform for calls, video and messaging. bOnline is the cheapest credible option, and it's built specifically for UK SMEs.

If you want to skip straight to comparing quotes, our VoIP systems page will match you with providers based on your team’s size and requirements.

At a Glance: The Best VoIP Providers 2026

Prices are per user per month, exclude hardware unless stated, and were checked against provider and comparison-site pricing pages. VoIP pricing changes often, so treat these as a starting point for quotes rather than a final number.

What is VoIP?

VoIP stands for Voice over Internet Protocol. It's what lets you make and receive calls over your internet connection instead of through a physical copper phone line. Rather than running a signal down a dedicated wire to an exchange, VoIP breaks your voice into data packets and sends them over the same broadband connection your business already uses for email and browsing.

For most businesses, that shift changes very little about how a call feels day to day. What it changes is everything behind the scenes: your phone number becomes something you can answer from a laptop, a mobile app or a desk handset; calls can be routed by rules rather than physical wiring, and features like call queues, voicemail-to-email and call recording become software settings rather than hardware upgrades.

Our small business guide to VoIP covers the mechanics in more depth if you're starting from scratch.

What We Compared: Key Criteria and Specs

Every provider in this guide was assessed against the same criteria, since price alone tells you very little about whether a system fits how your team actually works.

1. Price: per-user monthly cost, what's included at entry level, and where metered calling or add-ons push the real cost up

2. Call handling: queues, auto-attendants, call routing rules and supervisor tools

3. Integrations: CRM, helpdesk and Microsoft 365 or Google Workspace connections

4. Hardware: desk phone compatibility, and whether a softphone is usable on its own

5. International calling: whether it's metered, bundled, or unlimited to a set list of countries

6. AI features: transcription, call summaries, sentiment analysis and live coaching

7. Contracts: monthly versus annual, minimum terms, and porting policy

8. Support: whether support is UK-based and how it's delivered (direct or through a partner)

Our Ranking in Full: The Best VoIP Providers 2026

1. RingCentral

Best for: businesses that want one platform for calls, video and messaging with deep admin control

RingCentral is our pick for most UK businesses. It's the most widely deployed enterprise cloud communications platform globally, and that scale shows up in the depth of its admin console: permissions, call routing rules, queue analytics and integration policies are all configurable centrally, which matters once you're managing more than a handful of users.

Specs

Pros

• Deepest integration library of any provider on this list

• Mature admin controls, queue analytics and supervisor tools

• RingCX adds contact-centre features without switching platforms

• 14-day free trial, which is rare at this price point

Cons

• The £7.99 Essentials tier is capped at one user, so the headline rate doesn't reflect real team pricing

• Hardware is sold separately, typically £80 to £200 a handset

• Toll-free numbers and SMS bundles cost extra on lower tiers

Our verdict: if you want a single system that can grow from a handful of users into a full contact centre without a platform change, RingCentral is worth the higher mid-tier price. For a straightforward small team on a tight budget, price-check it against bOnline first.

2. bOnline

Best for: sole traders and small UK teams wanting a straightforward, low-cost phone line

bOnline is the cheapest credible VoIP option for UK small businesses. It's also the most deliberately simple: the dashboard, onboarding and support team are all UK-based and built for buyers who don't want to think about call routing rules or integration policies, just a working phone line.

Specs

Pros

• Cheapest entry plan with a UK phone line included

• UK-based onboarding and support, aimed at non-technical buyers

• No enterprise feature bloat to wade through during setup

Cons

• No Salesforce or deep CRM integrations

• 12-month minimum contract to get the advertised rate

• Limited supervisor and contact-centre tools, so it outgrows itself past around 15 users with complex call flows

Our verdict: for a sole trader, a two-person partnership, or a small team that just wants a working UK number with predictable costs, bOnline is the strongest starting point. It's worth noting that the £7 Starter plan only includes 100 outbound minutes, so if your team makes a lot of calls, the £13.95 Unlimited Calling plan is the one to budget for.

3. Gamma Horizon

Best for: businesses wanting a UK-hosted platform with local support, often via an existing broadband or IT partner

Gamma Horizon is worth understanding even if you never see the name "Gamma" on a quote. It's one of the UK's most established hosted VoIP platforms, and a large share of "cloud phone systems" sold by UK telecoms resellers and IT partners run on Horizon underneath a different brand. Gamma sells through a network of partners rather than direct, so pricing and service quality both depend heavily on who's selling it to you.

Specs

Pros

• UK-hosted, which matters for some regulated or public-sector buyers

• Generous pooled minute allowance across the whole team

• Free desk handsets on some partner packages, availability dependent

• Strong Microsoft 365 and Teams alignment for businesses already in that ecosystem

Cons

• No public price list, so the same seat can cost more through one partner than another

• Your support experience depends entirely on which partner sold it to you

• Comparing quotes properly means asking each partner what's actually included, not just the headline price

Our verdict: Horizon is a strong shortlist option, but it's the one provider on this list where the "who's selling it to you" question matters as much as the platform itself. Get at least two partner quotes and confirm exactly what support, hardware and change management are included before signing.

4. Vonage

Best for: established UK SMEs that want to start cheap and add features as they grow, without an annual lock-in

Vonage has been trading in the UK since 2005, and its pricing model reflects that maturity: rather than one fixed feature set per tier, you add lines, video conferencing or SMS bundles as your business needs them. It's also the only provider on this list offering monthly rolling contracts across every tier, not just as a premium add-on.

Specs

Pros

• Nearly 20 years of UK market presence

• Modular pricing lets you pay only for features you actually use

• Monthly contracts, unusual in this market

Cons

• The £10 entry tier meters outbound calls rather than offering unlimited

• Setup and per-line activation fees can apply outside promotional periods

• Contact-centre features sit in a separate product, Vonage Contact Center, not the core plan

Our verdict: if flexibility matters more to you than the lowest possible headline price, Vonage's ability to scale features up gradually without an annual commitment is a real advantage over bOnline or RingCentral.

5. 8x8 Work

Best for: businesses making regular international calls

If your team is regularly calling customers or suppliers overseas, 8x8's X-series plans are worth pricing against everyone else on this list. The X2 plan includes unlimited calling to 14 countries, and X4 extends that to 48, which can work out considerably cheaper than paying per-minute international rates on a metered plan elsewhere.

Specs

Pros

• Unlimited international calling on paper, not just "cheap" per-minute rates

• Mature contact-centre product line for businesses that need to scale support

• Meaningful negotiation room on quoted prices, particularly for larger commitments

Cons

• No public UK pricing at all, so you can't benchmark a quote against a published rate

• Typically among the pricier options once a quote lands

• Smaller UK installed base than RingCentral or Vonage, so fewer local case studies to draw on

Our verdict: worth quoting specifically if international calling is a meaningful part of your call volume. If it isn't, the lack of pricing transparency makes it harder to justify over a UK-focused alternative.

6. Dialpad

Best for: sales, support or customer success teams that want AI built into every call

Dialpad is the most AI-forward provider in this comparison. Real-time transcription, AI-generated call summaries, sentiment analysis and live coaching that gives managers feedback during a call in progress are all native features, not bolt-ons. For a team making 30 or more calls a day per person, this changes how a manager can run the floor.

Specs

Pros

• The strongest AI transcription and live coaching tools we've seen in this comparison

• Full-feature 14-day trial, so you can test the AI tools before committing

• Strong analytics for tracking call outcomes across a sales or support team

Cons

• UK pricing isn't published in GBP, so you'll need a quote to confirm the real cost

• Some integrations are gated behind Pro and Enterprise tiers

• UK-specific contact-centre features are still less mature than RingCentral's or 8x8's

Our verdict: if AI coaching and call analytics would change how your team performs, Dialpad justifies its position over cheaper, feature-light rivals. For a team that just needs reliable calls, it's more capability than you need.

7. Microsoft Teams Phone

Best for: businesses already running Microsoft 365 that want calls inside the app their team already uses

Teams Phone turns your existing Microsoft Teams into a full business phone system, so calls, chat, video and voicemail all live in one app rather than a separate softphone. If your business already pays for Microsoft 365, this is often the path of least resistance, since there's no new platform for staff to learn.

Specs

Pros

• No separate app to install or train staff on if you already use Teams daily

• Auto-attendants, call queues and intelligent transfers included in the Standard licence

• Direct Routing via a partner can undercut Microsoft's own calling plans

Cons

• The £6 add-on price assumes you're already paying for a Teams-enabled Microsoft 365 plan, so it's rarely the true standalone cost

• International minutes are billed separately unless you're on a higher Calling Plan tier

• Worth it mainly for businesses already committed to the Microsoft ecosystem

Our verdict: this is worth pricing carefully against a dedicated VoIP provider rather than assuming it's cheaper by default. It's worth noting that the real comparison is "Teams Phone plus your existing M365 licence" against "a standalone VoIP plan", not the £6 add-on price in isolation.

8. GoTo Connect

Best for: businesses with multiple offices, hybrid teams, or a mix of desk phone models already in place

GoTo Connect, formerly Jive, stands out for two things: unlimited free calling to more than 50 countries on every paid plan, and the widest desk-phone hardware compatibility of any provider we compared. For a business with several sites or an international customer base, both of those matter more than a lower headline price elsewhere.

Specs

Pros

• Unlimited international calling to 50-plus countries is a differentiator, not a marketing line

• Strongest hardware compatibility if you're keeping existing desk phones

• Built-in meetings remove the need for a separate video conferencing subscription

Cons

• No published UK list price, which makes comparison shopping slower

• Smaller UK customer base than RingCentral or Vonage

• Advanced analytics require the Premium tier

Our verdict: worth shortlisting specifically if you have multiple sites, a hybrid team spread across locations, or existing desk phones you don't want to replace.

New or Old Phone Numbers

One of the most common questions we hear from business owners moving to VoIP is whether they'll lose their existing phone number. In practice, you almost always keep it.

UK number portability is mandatory under Ofcom rules, so any VoIP provider can port your existing landline or mobile number across to their platform. Porting a business number typically takes 5 to 10 working days, and most providers port for free on an annual contract, though some charge £10 to £25 per number if you're on a rolling monthly plan. If you're porting a large number of lines, ask for that in writing before you sign, since it can add a meaningful cost on a 20- or 30-number account.

If you're starting fresh, a new VoIP number can usually be activated the same day, and most providers let you choose from local UK area codes even if your team isn't based there, which is useful if you want a number that matches a customer-facing location rather than your registered office.

VoIP PAs and Call Answering

A VoIP PA, more commonly called a virtual PA or call answering service, is a human-answered call handling service that sits on top of your VoIP number rather than replacing it. Instead of a caller reaching voicemail or an automated menu, a trained receptionist answers in your business's name, follows your script, and either transfers the call live to whoever's available or takes a detailed message.

This pairs naturally with VoIP because the routing is entirely digital. You can divert your VoIP number to a call answering provider during specific hours, when you're at capacity, or permanently if you don't want an in-house receptionist at all. It's a useful option for sole traders, small teams without dedicated reception cover, or any business that loses enquiries to voicemail during busy periods. Providers in this space typically charge per call or per bundle of inclusive minutes, so it's worth comparing a few before committing to one, since the difference between a good and mediocre call answering service comes down to how well they're briefed on your business, not the technology underneath.

Aligning VoIP With Your Business Broadband

VoIP calls travel over your internet connection, so your business broadband quality directly affects call quality. As a rough guide, each concurrent VoIP call needs around 100Kbps of upload speed, so a 10-person office with five simultaneous calls in progress needs roughly 500Kbps of upload headroom, which most modern UK business broadband handles comfortably. Latency and jitter matter more than raw speed for call quality: a connection with high latency can cause audible delay or choppy audio even if the download speed is fast.

If your business relies heavily on VoIP, it's worth asking your broadband provider whether Quality of Service (QoS) prioritisation is available, since this stops a large file upload or a busy Wi-Fi network from degrading call quality mid-conversation. For businesses with mission-critical call volumes, a leased line offers a dedicated, symmetrical connection that isn't shared with other local businesses, though it's a higher monthly cost than standard fibre broadband.

Our guide to business broadband versus leased lines covers when that upgrade is worth it, and if video calls specifically are a priority, our cheapest business broadband for video calls guide is a useful next read.

Call Routing

Call routing is the set of rules that decide what happens to an incoming call before a person answers it, and it's one of the biggest practical upgrades VoIP offers over a traditional phone line. Common routing options across the providers in this guide include:

• Auto-attendants: an automated menu that lets callers choose a department or person by pressing a number

• Hunt groups: a call rings multiple people in sequence or simultaneously until someone answers

• Time-based routing: calls route differently depending on the time of day, so out-of-hours calls can go straight to voicemail or a VoIP PA

• Skills-based routing: available on contact-centre tiers from providers like RingCentral, 8x8 and GoTo Connect, which routes a call to the agent best equipped to handle it

• Call queues: callers hear hold music and their position in the queue rather than getting an engaged tone

The right routing setup depends entirely on how your team actually takes calls. A five-person office might need nothing more than a simple hunt group and an out-of-hours voicemail message, while a 30-person customer service team will want proper queue analytics and skills-based routing from day one.

Softphones

A softphone is an app, usually on a desktop or mobile device, that lets you make and receive VoIP calls without a physical desk handset. Every provider in this guide includes a softphone as standard, and for a growing number of UK businesses, it's the only "phone" their team ever uses.

Softphones work well for teams that mostly work from a laptop, take calls on the move, or want to avoid the cost of desk hardware entirely. They're less suited to high-volume, customer-facing reception roles, where a physical handset with a hold button and transfer key is often faster in practice than navigating an app during a live call. Most businesses land somewhere in the middle: softphones for the wider team, and desk handsets for reception or anyone taking more than 30 calls a day.

Working From Home and on the Go

VoIP is, in our experience, one of the more underrated tools for supporting hybrid and remote teams, because a VoIP number isn't tied to a physical location the way a landline is. A member of staff can answer the same business number from a laptop at home, a mobile app on a train, or a desk phone in the office, and callers never know the difference.

This matters for two practical reasons. First, it means your business number stays consistent even as your team's working patterns change, so customers always reach the same number regardless of who's working from where. Second, most providers include mobile apps with full call-handling features, including transfer, hold and voicemail, so home and mobile working don't have to mean a downgrade in call quality or features compared with the office.

If your team is spread across several sites or works flexibly, GoTo Connect and RingCentral both handle multi-location routing particularly well, and our guide to comparing SME phone and broadband bundles is worth reading if you're setting up connectivity for a distributed team from scratch.

Residential Customers

Everything in this guide is aimed at businesses, but it's worth noting that the PSTN switch-off applies to residential customers too, and the technology is the same. Home broadband providers such as BT, Sky, Virgin Media and Vodafone now bundle a digital voice service with home broadband as standard, replacing the traditional landline socket with a service that runs over the router.

The main practical difference for residential customers is that digital home phone services don't work during a power cut unless you have a battery backup unit, which providers are required to offer to customers identified as vulnerable or reliant on their landline for things like telecare alarms. If you run a business from home and are considering whether to use a residential digital voice service or a proper business VoIP number, the business option is almost always worth the extra cost, since it includes call routing, a softphone app and the ability to answer calls away from your home address, none of which a residential digital landline offers.

AI Features in VoIP

The depth of AI-assisted features varies a lot between VoIP providers. The features worth understanding are:

• Live transcription: turns a call into text in real time, useful for accuracy and for staff who can't always take handwritten notes mid-call

• Call summaries: an AI-generated summary of what was discussed and agreed, saving time on manual note-taking after every call

• Sentiment analysis: flags whether a caller sounded frustrated or satisfied, useful for customer service teams prioritising follow-ups

• Real-time coaching: gives a manager or the agent themselves live prompts during a call, for example flagging when a required disclosure hasn't been mentioned

Dialpad is the clear leader on this list for AI depth, with all four features native to the platform. RingCentral and 8x8 both offer AI transcription and summaries on higher tiers, while bOnline and Gamma Horizon are more focused on core calling than AI tooling. If AI features are a priority rather than a nice-to-have, it's worth testing them directly during a trial rather than taking a feature list at face value, since transcription accuracy in particular varies more between providers than most comparison pages let on.

Best Alternatives to VoIP

VoIP is the right answer for most businesses, but it isn't the only way to handle business calls, and a couple of alternatives are worth knowing about.

• SIP trunking with an on-premises PBX: rather than a fully hosted cloud system, some businesses keep an on-premises PBX (such as 3CX) and connect it to the outside world via a SIP trunk. This can work out cheaper over a multi-year term for a business with an existing PBX investment, though it comes with more setup complexity and no built-in cloud redundancy.

• Mobile-only business numbers: apps that give you a separate business number on your existing mobile, without any desk-based system at all. This suits sole traders or very small teams who mostly work from a phone anyway and don't need call queues or multi-user routing.

• Microsoft Teams or Google Voice as an add-on: covered above under Teams Phone, this is less a true "alternative" than a different route into VoIP, worth considering if you're already paying for the productivity suite.

When VoIP Doesn't Make Sense For Your Business

A few situations where it's worth pausing before signing up:

• You have dedicated analogue lines for equipment, not people. Alarm panels, lift phones, door entry systems and some card payment terminals often run on their own analogue line. These usually need an analogue terminal adaptor (ATA) to work over VoIP, so factor that hardware cost and a compatibility check into your migration plan rather than assuming it'll just work.

• Your broadband is unreliable. If your connection drops regularly and you don't have a solid 4G or 5G backup option, moving your only phone line onto that same unreliable connection is a real risk. Fix the connectivity first, or make sure your VoIP provider offers automatic mobile failover.

• You're a very low call-volume sole trader. If you take a handful of calls a week and already run your business from a mobile, a dedicated VoIP system may be more infrastructure than you need. A mobile-only business number app might serve you better.

Installation

Getting set up with VoIP is usually far quicker than switching a traditional phone line ever was. For a small business on a mainstream provider like bOnline, RingCentral or Vonage, a new number can be live the same day, and the softphone app is typically ready to use within minutes of signing up.

Where it takes longer is porting an existing number, which generally takes 5 to 10 working days, and any physical desk phone hardware, which needs to be ordered, shipped and configured. For a partner-delivered platform like Gamma Horizon, or any multi-site rollout, expect a site survey and a proper migration plan rather than a same-day activation, since the partner needs to map your existing extensions, hunt groups and call routing before cutting over. If you're migrating off a multi-line PBX rather than a single analogue line, it's worth running the new VoIP system in parallel with the old one for a couple of weeks before switching over fully, particularly if missed calls would cost your business real money.

Availability

VoIP itself works anywhere with a decent internet connection, so the platform choice isn't limited by postcode the way broadband speed is. What does vary by location is the quality of the broadband connection you'll be running it over, and in some rural or poorly served areas, that's the actual constraint on call quality rather than the VoIP provider itself.

Before choosing a VoIP plan, it's worth checking what broadband is available at your business address using our broadband availability checker, and our guide to business broadband providers in your area covers what to expect regionally.

If full fibre isn't available yet, most VoIP providers still work perfectly well over FTTC or a strong 4G/5G connection, so it's rarely a reason to delay switching before the 2027 deadline.

FAQs About VoIP Providers

Which VoIP provider is best?

RingCentral. This is the best all-round choice for most UK businesses in 2026, thanks to its integration depth and admin controls. The "best" provider depends on your priorities, though: bOnline for the lowest cost, Gamma Horizon for UK-hosted delivery, Dialpad for AI features, and Microsoft Teams Phone if your business already runs on Microsoft 365.

Which VoIP provider is cheapest?

bOnline. This is the cheapest credible option, from £7 per user per month plus VAT, though that entry tier only includes 100 outbound minutes rather than unlimited UK calls. RingCentral's Essentials plan is technically cheaper at £7.99, but it's capped at one user, so it doesn't reflect real multi-seat pricing.

Do I need to change my phone number to switch to VoIP?

No. UK number portability rules mean any VoIP provider can port your existing landline or mobile number, typically within 5 to 10 working days.

Will VoIP still work after the PSTN switch-off?

Yes. VoIP is the technology replacing the analogue PSTN network, so businesses already on VoIP don't need to do anything for the switch-off itself. It only affects businesses still relying on traditional analogue lines.

What internet speed do I need for VoIP?

Around 100Kbps of upload speed. A small office making several calls at once will comfortably fit within most modern UK business broadband packages, though latency and jitter affect call quality more than raw speed.

Can I use VoIP for a home-based business?

Yes. VoIP works over any decent internet connection, including home broadband, and gives a home-based business a professional number and call routing that a residential landline can't offer.

Do I need a desk phone, or is a softphone enough?

For most SMEs and remote teams, a softphone app on a laptop or mobile handles day-to-day calling well. Desk handsets are worth the extra cost for reception roles or anyone taking more than 30 calls a day.

Our Verdict

For most UK businesses, RingCentral is the strongest starting point in 2026, particularly once you're past five or six users and need proper admin controls and integrations. If cost is your main constraint, bOnline gets you a working UK number and unlimited calls for less than any other credible provider on this list. If you'd rather work through a UK-based reseller or IT partner and want the reassurance of UK hosting, Gamma Horizon is worth shortlisting, though you'll need to shop the partner as carefully as the platform.

Beyond those three, the right choice comes down to what your business actually needs: Vonage if you want to avoid an annual lock-in, 8x8 or GoTo Connect if international calling is a real cost centre, Dialpad if AI coaching would change how your team performs, and Microsoft Teams Phone if you're already committed to the Microsoft ecosystem. Whichever you choose, the 31st January 2027 PSTN switch-off means the honest advice is to start comparing quotes now rather than leaving it until your existing line is switched off for you.