Best Business VoIP Providers in the UK — 2026 Comparison

This comparison assesses the leading UK business VoIP options on price, features, reliability and SME suitability, so you can shortlist the right provider without wading through sales decks.

Which business VoIP provider is best for a UK SME?

The right provider depends on three things: your headcount, your existing technology stack, and how much hands-on support you want. Larger global businesses lean toward enterprise UCaaS platforms; UK SMEs that value a single supplier and a named account manager are better served by a managed provider like AMVIA.

• Choose AMVIA if you want a fully managed UK VoIP service — setup, number porting, hardware and ongoing support — from a provider who can also run your IT, connectivity and cybersecurity. Best for UK SMEs wanting one supplier and hands-on support.
• Choose RingCentral or 8x8 if you are a larger business with global offices needing an enterprise UCaaS platform, international calling bundles and advanced analytics. Strong platforms, but less focused on the SME managed-service model.
• Choose BT Cloud Voice if you already have a BT relationship and prefer to consolidate telephony with your connectivity provider. Capable hosted telephony, though Teams integration and support responsiveness can be more limited than a specialist.

How do the leading UK business VoIP providers compare?

The table below sets the leading UK providers side by side on the features that decide SME suitability — bundled call recording, Teams Direct Routing, UK-based support and account management. AMVIA bundles call recording, a UK call package and account management into its base price; most enterprise platforms charge these as add-ons.

Prices indicative as of March 2026. Actual pricing varies by contract term, user count and feature tier. AMVIA pricing includes a UK call bundle, call recording and account management. Third-party pricing is based on published list rates — volume discounts are available from all providers.

What should you prioritise when comparing UK VoIP providers?

Prioritise UK-based support, Microsoft Teams integration via Direct Routing, whether call recording is included or charged as an add-on, and contract flexibility. Many global providers route support through overseas centres, which slows resolution when a phone outage is costing you business.

Switching is common when the experience disappoints: 42% of UK consumers have switched providers due to a poor phone experience, and 67% still prefer phone calls for urgent matters (2025 UK data). Mobile flexibility matters too — 74% of employees use mobile apps for business VoIP calls (2025 UK data). With the UK PSTN switch-off scheduled for completion by January 2027 (Openreach), migration support is now a buying criterion, not a nice-to-have. Ofcom's guidance on moving landlines to digital sets out what the switchover means for businesses (ofcom.org.uk). For a deeper look, see our guide to the PSTN switch-off.

Is VoIP cheaper than a traditional phone system?

Yes — for almost every SME. A traditional on-premises PBX for a 20-user business typically needs £5,000–£15,000 in hardware and installation, plus annual maintenance and ISDN line rental. A managed VoIP service is an operating cost instead of a capital one.

A managed VoIP service costs £12–£20 per user per month — for a 20-user business that is £2,880–£4,800 per year, inclusive of calls, maintenance and support. The ROI case is strong before you even factor in flexible, cloud-based working. A hosted phone system removes the on-premises hardware entirely.

Can you use Microsoft Teams instead of a separate VoIP provider?

Yes — through Teams Direct Routing or Microsoft Calling Plans, your existing Teams environment becomes a full business phone system. Teams Phone is now widely used as a full business phone system, and for Microsoft-centric SMEs it removes the need for a second app entirely.

Direct Routing via a provider like AMVIA often costs less per minute than Microsoft's own calling plans and gives you more control over number management and call routing. Microsoft's own documentation explains how Direct Routing connects Teams to the public telephone network (learn.microsoft.com). See our Microsoft Teams Direct Routing service for how AMVIA sets this up.

The AMVIA recommendation

For UK SMEs wanting UK-based support, Microsoft Teams integration and a single provider for connectivity and telephony, AMVIA VoIP is our recommendation. Larger businesses needing global PSTN replacement should weigh RingCentral. If you are Microsoft-centric, Teams Phone via AMVIA's Direct Routing service offers the smoothest experience — and because we are a security partner first, your call platform is configured with VoIP security built in, not bolted on.