6 Cheapest VoIP Providers in the UK 2026 (From £4.50/mo)

The cheapest VoIP provider in the UK is Virtual Landline, starting from just £4.50 per month for a single business number with unlimited inbound calls. If you need a full multi-user phone system on a budget, bOnline offers the best value at £7.00 per user per month with HD calls, a mobile app, and UK-based support.

We compared pricing, features, and real user reviews across 12 UK VoIP providers to find the six that genuinely deliver business-grade calling for under £10 per user per month. Every price listed below was verified directly from each provider’s website in March 2026.

Cheapest VoIP Providers Compared

All six providers cost under £10 per user per month, but there are significant differences in what you get for your money. Virtual Landline is the cheapest at £4.50, but it’s a single-number service – not a full phone system.

The Real Cost: 12-Month Breakdown for a 5-Person Team

Headline prices tell you very little about what VoIP actually costs. Per-minute charges, required add-ons, and setup fees can double your bill. Here’s what each provider would genuinely cost a 5-person team making roughly 500 outbound minutes per month over 12 months.

Key insight: bOnline is actually the cheapest option for a 5-person team when you factor in call charges, despite Virtual Landline having the lowest headline price. Google Voice looks cheap per-user but requires a paid Google Workspace subscription on top, pushing the real cost above RingCentral.

Virtual Landline is the cheapest VoIP service in the UK at £4.50 per month for a single business number. It’s not a full phone system – it’s a virtual number service that forwards calls to your mobile, giving sole traders and freelancers a professional landline presence without the hardware.

The service includes unlimited inbound calls, a mobile and desktop app for making outbound calls, call scheduling controls, and basic call flow management. You can choose a local (01/02) or national (0330) number, and there’s no contract – it’s monthly rolling.

Where Virtual Landline falls short is scale. You get one number per account on the basic plan, no voicemail transcription, and outbound calls are charged per minute. If you need multiple users or extensions, step up to their Office system at £6.95/month – still very competitive but a different proposition entirely.

bOnline is the cheapest full VoIP phone system in the UK at £7 per user per month (+VAT). Unlike Virtual Landline, this is a proper multi-user business phone system with HD calls, a mobile app, call analytics, and UK-based customer support – purpose-built for small businesses with 1-50 employees.

The Starter plan includes unlimited inbound calls, a digital phone line with a local UK number, and basic call management features. bOnline claims to be the UK’s number one small business phone provider, and their Trustpilot reviews back this up – users consistently praise the call quality and setup simplicity. Where they let you down is outbound calls: you get a capped minutes bundle, and going over costs extra.

If you need more advanced VoIP features like CRM integration, that’s available but costs an additional £8/month per user. For most small teams just needing reliable business calls, the Starter plan delivers excellent value.

Google Voice is the only provider on this list offering unlimited domestic calls at under £8 per user per month. The Starter plan costs $10/user/month (approximately £7.35 at current exchange rates) and includes unlimited calls to UK numbers, voicemail transcription, and spam filtering powered by Google’s AI.

The catch: Google Voice requires an active Google Workspace subscription (from £5.75/user/month), so the true cost is closer to £13/user/month if you’re not already paying for Workspace. If your team already uses Gmail, Google Calendar, and Google Meet, Voice slots in seamlessly and the marginal cost is genuinely cheap. If you don’t use Google’s ecosystem, this isn’t the provider for you.

Call management features are more limited than dedicated VoIP platforms like PBX systems – there’s no IVR menu on the Starter plan, and integrations with non-Google tools are restricted. But for outbound-heavy teams already in the Google ecosystem, the unlimited calling alone justifies the price.

RingCentral’s Essentials plan at £7.99 per user per month is remarkable value from a provider that typically sits in the premium tier. This is a full unified communications platform – voice, video meetings, team messaging, and file sharing – at a price that undercuts most budget-only providers on features.

The appeal is scalability. Start on Essentials at £7.99, and when your team grows, you can upgrade to Standard (£23.99) or Premium (£28.99) without switching providers or migrating numbers. RingCentral supports 100+ integrations on higher plans, built-in IVR and auto-attendant, and 99.999% uptime SLA. For a business planning to scale from 5 to 50 employees, starting cheap on RingCentral avoids a painful migration later.

The trade-off on the Essentials plan is a 100-minute outbound call bundle and no CRM integrations – those require the Standard plan. If your team makes heavy outbound calls, the overage charges could make this more expensive than it looks. Check our full RingCentral review for a detailed breakdown.

NBC Cloud Voice’s Call Centre Basic plan starts at £9.99 per user per month, making it the cheapest option specifically designed for teams handling high call volumes. Unlike the other providers here, NBC focuses on call centre features – agent management, call queuing, and direct debit billing for larger teams.

The catch with NBC is that no call bundle is included. Every outbound call is charged per minute, which means your actual monthly cost depends entirely on how much your team calls. For inbound-heavy operations (customer service lines, support desks), this works well. For outbound sales teams, the per-minute charges could push your real cost well above providers with bundled minutes.

NBC also requires a 12-month minimum contract, unlike bOnline and Virtual Landline which offer monthly rolling terms. If you’re running a dedicated call centre on a budget, NBC is worth evaluating – but model your actual call volumes before committing.

Vonage’s Express plan sits right at the £10/user/month mark, making it the most expensive option on this list – but also the most feature-rich. You get customisable dashboards, dynamic local caller ID (your outbound calls show a local number to the recipient), and a wide range of call training features like whisper, barge, and monitor.

Vonage is best suited to teams that need calling features beyond basic VoIP but can’t justify the £20+ per user cost of enterprise platforms. The dynamic caller ID alone can significantly improve answer rates for outbound sales teams. However, calling is metered (not unlimited), and software integrations are limited on the Express plan.

If you’re comparing Vonage against the other providers here, the question is whether the extra features justify the ~£3/user premium over bOnline. For a 5-person team, that’s £180/year more. Read our full Vonage review for a deeper analysis.

Hidden Costs to Watch For With Cheap VoIP

The biggest mistake businesses make with cheap VoIP is looking at the headline price and ignoring what’s not included. These are the costs that catch people out.

Per-minute call charges: Four of the six providers on this list charge per minute for outbound calls. If your team makes 500 outbound minutes per month, that’s £25-50 per month in call charges on top of the subscription – potentially doubling your bill. Only Google Voice includes unlimited UK calls.

Required add-on subscriptions: Google Voice requires Google Workspace (from £5.75/user/month). Some providers charge extra for features you might assume are included: bOnline charges £8/user/month for CRM integration, and RingCentral locks integrations behind the £23.99 Standard plan.

Number porting fees: Most providers offer free number porting, but check the small print. Some charge £5-15 per number to port, and the process can take 5-10 working days during which you might need to run parallel services.

Hardware costs: All six providers work with softphones (apps on your mobile or desktop), so hardware is optional. If you want desk phones, expect £50-150 per handset. bOnline includes a cordless WiFi handset on their Unlimited Calling plan, but not on Starter.

Early termination fees: NBC Cloud Voice has a 12-month contract, and RingCentral’s cheapest price requires annual billing. Breaking these early typically costs 30-100% of remaining contract value.

Which Cheap VoIP Provider Should You Choose?

The right choice depends on your team size, call patterns, and existing tech stack. Here’s a decision framework based on the most common scenarios we see.

Choose Virtual Landline if you’re a sole trader, freelancer, or one-person business that just needs a professional number. You don’t need multiple extensions or a multi-line system – just a local landline number that rings your mobile.

Choose bOnline if you have a small team (2-20 people) and want the simplest, cheapest full phone system. The £7/user price with UK support and monthly rolling contracts makes it the safest choice for most small businesses.

Choose Google Voice if your team already pays for Google Workspace. The marginal cost of adding Voice is genuine value, and unlimited calls means no surprise bills. If you don’t use Google Workspace, look elsewhere.

Choose RingCentral if you’re growing and want a platform you won’t outgrow. Starting at £7.99 on Essentials and scaling to Premium gives you a growth runway without provider migration. Best for teams planning to be 20-50 people within two years.

Choose NBC Cloud Voice if you run an inbound call centre or customer service operation and need agent management tools. Model your outbound call costs carefully before committing to the 12-month contract.

Choose Vonage if you need calling features that smaller providers lack – dynamic caller ID, call training tools, and customisable dashboards. Best for small outbound sales teams that value features over the absolute lowest price.

How We Compared These VoIP Providers

We evaluated 12 UK VoIP providers to find the six that offer genuine business-grade calling for under £10 per user per month. Providers were assessed across five criteria: verified pricing (including hidden costs), included call minutes, feature set, contract flexibility, and real user reviews from Trustpilot and G2.

All pricing was verified directly from each provider’s website in March 2026. Where providers list prices in USD (Google Voice), we converted at the prevailing exchange rate and noted this. The 12-month cost calculations assume a 5-person team making approximately 500 outbound minutes per month, using standard UK business calling patterns.

We excluded providers with entry plans above £10/user/month, providers without UK phone numbers, and providers that have been acquired or discontinued since January 2026. With the PSTN switch-off now complete, every provider on this list delivers calls entirely over internet protocol.

Emma Clarke

Technology & Payments Specialist

Emma covers the full range of business technology, including EPOS systems, merchant accounts, telecoms, and web tools. Her experience as a retail systems consultant helps businesses choose the right digital solutions to improve efficiency and sales.

Reviewed by

Alex Morgan

Business Technology Analyst