8 Best UK VoIP Providers For Your Business

The best UK VoIP provider for most businesses in 2026 is RingCentral, with bOnline winning on price (from £7/user/month) and BT Business the safe choice for buyers who want an established UK incumbent. Below we compare 8 leading providers head-to-head with verified May 2026 pricing, three worked cost examples for 5-, 15- and 50-user teams, and a section on the hidden costs every buyer needs to know before signing.

This guide matters now because Openreach is retiring the UK's analogue PSTN network on 31 January 2027. Every business still on a traditional landline must migrate to a digital service before then or risk losing phone access overnight. We've verified rates against each provider's own pricing pages, cross-checked features against G-Cloud filings where available, and weighed UK reviewer feedback from SIP trunk operators and direct customers to ground every recommendation.

UK VoIP Providers Compared at a Glance

The 8 providers below cover every major UK use case — from sole traders needing a single business number to enterprise contact centres routing thousands of daily calls. Entry pricing ranges from £7/user/month (bOnline) to quote-based for enterprise tiers, with most mid-market plans landing £12–£25/user/month before hardware.

RingCentral is the most widely-deployed enterprise VoIP platform in the UK and the strongest all-round choice for businesses that want one system to handle phones, video, messaging and integrations. The Essentials plan starts at £7.99/user/month with annual billing, with Standard at £19.99 and Premium at £24.99 each adding deeper analytics, integrations and supervisor controls.

Where RingCentral pulls ahead of cheaper rivals is administrative depth. Permissions, call routing rules, queue analytics and integration policies (Salesforce, Microsoft 365, HubSpot and 250+ others) are all configurable from a single console. The trade-off is a higher entry-tier user cap — the £7.99 plan is single-user only — so genuine multi-seat teams should price-compare against bOnline and Vonage.

bOnline is the cheapest credible VoIP option for UK small businesses, with the Starter plan at £7/user/month +VAT (annual contract) including unlimited UK landline and mobile minutes plus a digital phone line. It's purpose-built for the SME market — the dashboard, onboarding flow and support team are all UK-based and pitched at non-technical buyers.

The simplicity is also the limit. There's no Salesforce or HubSpot integration on lower tiers, no contact-centre features, and the plan structure rewards committing to 12 months upfront. For a sole trader, two-person partnership or 5-person SME wanting a UK phone number with unlimited calls and minimal admin, bOnline is the strongest budget choice. Above 15 users with CRM workflows, the value advantage tightens against RingCentral and Vonage.

Vonage Business Communications has been in the UK market since 2005 and remains a strong middle-ground choice for businesses that want enterprise-grade features without RingCentral pricing. The Express plan starts at £10/user/month with metered outbound calling, while Plus and Premium tiers add unlimited UK calls, CRM integrations and a softphone for around £14–£25/user/month.

Vonage's pricing model rewards buyers who don't need every feature on day one — you can start cheap and add lines, video conferencing, or SMS bundles as you grow. The downside is the £10 entry tier meters outbound calls, so a high-call-volume team will end up on Plus or Premium. Read our full Vonage review for the per-tier feature breakdown.

GoTo Connect (formerly Jive) is the strongest choice for businesses with multiple offices, hybrid workforces or international call needs. The platform's standout feature is unlimited free calling to 50+ countries on every paid plan — a single capability that justifies the higher price tag for any business with overseas customers, suppliers or remote staff.

UK pricing is quote-based but typically lands around £18–£22/user/month for the standard Phone System tier and higher for the Connect Centre add-ons. Hardware integration is also a strength — GoTo supports more desk-phone models out of the box than RingCentral or Vonage. The trade-off is the lack of published UK list prices, which makes apples-to-apples comparison harder during procurement.

Dialpad is the most AI-forward provider in this comparison, with native real-time transcription, AI-generated call summaries, sentiment analysis and a coaching tool that gives live feedback to agents during calls. For sales, customer success, or support teams making 30+ calls per person per day, the AI features genuinely change how managers run the team.

UK pricing is the catch — Dialpad displays USD list prices ($15–$25/user/month) and the GBP equivalent is JS-rendered, requiring a quote for confirmation. Expect roughly £12–£20/user/month for the Standard and Pro tiers respectively. Our Dialpad review covers the AI feature set in detail.

Google Voice for Business is the simplest VoIP add-on for any team already paying for Google Workspace. The Starter plan adds a single business number per user from $10/user/month (USD billing only) on top of an existing Workspace subscription, with calls handled inside Gmail, Calendar and the Voice apps you already use.

The trade-offs matter. Google Voice has tight user caps (Starter: 10 users max, 10 domestic locations), no contact-centre features, no integrations outside the Google ecosystem, and bills in USD even for UK customers. For a UK team of 5–15 already on Workspace that just needs business numbers, it's the fastest path to VoIP. For everything else, RingCentral or Vonage offer more capability per pound. See our Google Voice review for the limitations in detail.

BT Business is the safe choice for buyers who want a single supplier covering broadband, mobile and phone systems with a household-name brand behind it. The current Enhanced plan sits at £18/user/month ex VAT, scheduled to rise to £19 from April 2026 and £20 from April 2027 — transparent pricing, but pricier than every other option in this comparison.

Where BT genuinely earns the premium is bundled UK SLA support, which matters if your team can't afford to triage VoIP outages themselves. Where it doesn't earn the premium is feature depth: BT Business Phone System lacks the AI tooling of Dialpad, the international reach of GoTo Connect, or the integrations of RingCentral. Read our BT Business review for the SLA and contract small print.

8×8 Work is the strongest choice for businesses making heavy international call volumes. The X2 plan ($24/user/month annual, USD list) includes unlimited calling to 14 countries, while X4 ($44/user/month) extends to 48 countries. For a UK team selling into mainland Europe, North America and APAC, the per-call savings against any metered alternative are substantial.

UK customers should expect quote-based GBP pricing and meaningful negotiation room — third-party data shows 8×8 routinely discounts 5–35% based on commitment volume. The X-series also includes contact-centre tiers (X6, X7, X8) for businesses needing skills-based routing, omnichannel agent desktops, or workforce management. The downside: pricing transparency is poor, with most CTAs routing to a sales team.

How Much Does Business VoIP Actually Cost? Worked Examples

Headline "from £7/user/month" rates rarely reflect what a real UK business pays. Once you add hardware, monthly fees, taxes and any setup costs, true monthly bills tend to land 30–60% higher. Here are three worked examples using verified May 2026 prices for typical UK team sizes.

Three patterns repeat across every UK business we've costed. First, hardware is roughly 50% of year-one spend on teams adding desk phones — budget £80–£200 per handset depending on model. Second, mid-tier plans (RingCentral Standard, Vonage Plus) are the value sweet spot for teams of 10–30 — entry tiers lack call analytics, top tiers add features most teams never use. Third, contact-centre features push monthly cost above £30/user once you add supervisor seats, queue analytics and outbound dialling tools.

PSTN Switch-Off: Your Migration Action Plan

Openreach is switching off the UK's analogue PSTN network on 31 January 2027. Every business with traditional landlines must migrate to a digital service before then or lose phone access overnight. Here's the action plan by where you are today — pick the one that matches your current setup.

If you're still on analogue PSTN lines

• This quarter: Inventory every line in your business. Don't forget alarm panels, lift phones, card terminals, fax machines and door entry systems — these often run on dedicated analogue lines.
• 3 months out: Get quotes from two VoIP providers (one mainstream like RingCentral, one budget like bOnline). Confirm number portability for every existing number.
• 1 month out: Schedule the install during a quiet business period — porting takes 5–10 working days and there's a brief overlap window.
• For alarm/PDQ lines: Most modern alarms and card terminals now run over IP, but older units need an analogue terminal adaptor (ATA). Order the ATA at the same time as the new VoIP service.

If you're on a multi-line PBX

• Decide: replace the on-premise PBX with cloud VoIP, or keep it and connect via a SIP trunk. Cloud is cheaper for most businesses under 50 users; SIP trunks suit teams with substantial existing PBX investment.
• Audit: list every extension, hunt group, voicemail box and call routing rule. These all need to be re-created in the new system.
• Test: run the new VoIP system in parallel for at least two weeks before pulling the PBX. Critical for businesses where missed calls cost real money.
• If you have managed PBX: ask your installer if they offer a cloud PBX upgrade. Often the simplest migration path because they retain ownership of routing rules.

If you're already on VoIP

Nothing to do for the switch-off itself — cloud VoIP is the technology replacing PSTN. Use the deadline as a prompt to renegotiate your contract: any provider locked into a multi-year deal at 2024 rates may have room to discount or upgrade your tier in exchange for renewal.

Hidden Costs to Watch For

The headline price is rarely the bill. Three categories of cost show up repeatedly when we audit UK business VoIP contracts post-purchase. None are dishonest pricing — they're all in the small print — but each one can add 15–40% to year-one cost if you don't plan for them.

1. Number porting fees

Most providers advertise "free porting" but condition it on annual contracts. On monthly plans, expect £10–£25 per number ported. For a 30-number business this is £300–£750 of unbudgeted cost. Always confirm the porting policy in writing before signing — ideally with a clause exempting porting from any future cancellation calculation.

2. International rates outside "unlimited" plans

Plans advertising "unlimited calls" almost always mean unlimited UK calls. International calls fall into per-minute rates that can range from 1p/min (mainland Europe) to £2/min (premium-rate destinations). If your team makes regular international calls, either pick a plan that includes them (GoTo Connect's 50-country bundle, 8×8 X2/X4) or budget £30–£100/user/month extra.

3. Auto-renewal and early-termination clauses

Annual VoIP contracts auto-renew by default with most providers, often with a 30- or 60-day cancellation notice window. Miss the window and you're locked in for another year. Calendar the renewal date 90 days in advance and use the lead time to renegotiate or comparison-shop. Early termination clauses typically charge 50–100% of remaining contract value — non-trivial on a 50-user contract.

How to Choose the Right VoIP Provider

Working through these four questions in order narrows 8 providers down to 1–2 finalists for almost every UK business.

1. How many users? Sole trader or 1–5 users → bOnline or RingCentral Essentials. SME 5–15 → bOnline, Vonage or RingCentral Standard. Mid-market 15–50 → RingCentral Standard, Vonage Plus, GoTo Connect. Enterprise 50+ → RingCentral Premium, 8×8 X-series, BT Business.
2. Do you need international calling? Heavy use → GoTo Connect (50 countries) or 8×8 X4 (48 countries). Occasional → any provider on a metered plan with reasonable per-minute rates.
3. Monthly or annual contract? Monthly available → Vonage and RingCentral. Annual only at advertised rates → bOnline, Dialpad, GoTo Connect, BT Business.
4. Hardware? BYOD softphone-only → any provider works. Desk handsets needed → GoTo Connect supports the widest hardware list, RingCentral and Vonage cover most current models, BT typically bundles its preferred handsets.

For most UK SMEs, the practical decision is bOnline (cheapest with full UK calls), RingCentral (best feature depth at moderate price) or Vonage (best monthly-contract option). Larger businesses with international needs should price-compare GoTo Connect and 8×8 directly. Compare phone systems across the wider market if your needs sit outside the providers above.

Last updated: May 2026. All pricing verified against provider pricing pages and G-Cloud framework filings between February and May 2026. We update this guide quarterly.

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

James Hartley

Technology & Innovation Reviewer