List of VoIP Providers in the UK | 2025 Business Guide
The UK VoIP market includes carrier-grade hosted platforms, UCaaS providers, and specialist small-business services. This guide lists the leading UK VoIP providers with pricing, features, and an honest assessment of who each suits best — helping businesses identify the right shortlist for their requirements.
Ollie Hill-Haimes
Sales Director
UK VoIP Providers: The Full Market View
The UK hosted VoIP market is well-developed. Businesses have genuine choice across a range of price points and capabilities. The following list covers providers most relevant to UK SMEs and mid-market businesses, grouped by market positioning.
Carrier-Grade Hosted PBX
Gamma Horizon
Built on Cisco Broadworks, Gamma Horizon is one of the most established hosted VoIP platforms in the UK market. Available exclusively through reseller partners. Strong uptime SLA (99.99%), comprehensive feature set, and excellent UK carrier infrastructure.
Pricing: £12–£18/user/month. Best for: SMEs and mid-market businesses wanting a managed, reliable hosted phone system through a trusted UK reseller.
Daisy Communications
A UK-based managed communications provider offering hosted telephony alongside connectivity. Strong presence in the SME market with managed service delivery. Pricing is typically delivered through a managed service quote.
Vodafone One Net
Vodafone's converged fixed-mobile communications platform. Integrates desk phones and mobile handsets under a single extension. Well-suited to businesses with significant mobile working requirements. Typically bundled with Vodafone mobile contracts.
UCaaS Platforms (International with UK Operations)
RingCentral
A mature UCaaS platform combining VoIP, video, and messaging. Extensive integration library (250+ apps). Strong for CRM integration and multi-site deployments. Pricing: £15–£25/user/month.
8x8
UCaaS platform with strong contact centre capability. Unlimited calling to 40+ countries on higher plans. Pricing: £12–£20/user/month.
Vonage (Ericsson)
UCaaS and API communications platform. Competitive standard VoIP product; differentiated by developer API for custom integrations. Pricing: £10–£20/user/month.
Zoom Phone
Zoom's extension into business VoIP. Shares the familiar Zoom interface and integrates tightly with Zoom Meetings. Growing UK presence. Pricing: From approximately £10–£17/user/month.
Software PBX
3CX
Software-based IP PBX deployable in the cloud, on a private server, or on-premise. Cost-effective, particularly at higher user counts. Requires IT capability or a managed IT provider for best results. Pricing: £8–£14/user/month (hosted).
Microsoft Ecosystem
Microsoft Teams Phone
Adds PSTN calling to Microsoft Teams. Requires a Teams Phone licence plus a calling plan or direct routing arrangement. Native integration with all Microsoft 365 applications. Pricing: £11–£21/user/month total.
Small Business / Entry-Level
bOnline
A UK provider specifically targeting micro-businesses and sole traders. Simple setup, competitive pricing for very small user counts. Limited advanced features. Pricing: From approximately £8–£12/user/month.
Dialpad
AI-powered cloud communications platform with built-in call transcription and sentiment analysis. Growing UK presence. Pricing: From approximately £12–£18/user/month.
GoTo Connect (formerly Jive)
A US-headquartered SME-focused UCaaS platform with reasonable UK coverage. Strong visual dial plan editor for call routing configuration. Pricing: From approximately £12–£18/user/month.
SIP Trunk Providers
For businesses with existing on-premise PBX systems that want to replace ISDN lines with IP connectivity:
- Gamma Carrier: Wholesale SIP trunks, typically accessed through resellers
- BT Wholesale: SIP trunks available through BT and resellers
- Andrews & Arnold (AAISP): Technical SIP trunk provider, popular with technically sophisticated SMEs
- Gradwell: UK SIP trunk provider with a strong SME customer base
How to Choose
The right provider depends on your business size, feature requirements, existing technology stack, and budget. AMVIA works with Gamma Horizon, 3CX, and Microsoft Teams Phone and can provide a tailored recommendation based on your specific situation.
Not Sure Where to Start?
AMVIA shortlists the right VoIP providers for your business — saving you the time of evaluating the full market independently.
Frequently Asked Questions
There are dozens of VoIP providers serving UK businesses — ranging from large UCaaS platforms like RingCentral and 8x8 to UK-native carriers like Gamma, specialist small-business services, and SIP trunk providers. The number of active providers makes independent comparison tools and advisers particularly valuable.
For a five-person business, bOnline, Gamma Horizon (via a reseller), and 3CX are strong options at the lower end of the user count. Microsoft Teams Phone is compelling if Microsoft 365 is already in use. The right choice depends on whether physical desk phones are needed and what features are required.
Yes. Gamma, Daisy Communications, and Andrews & Arnold are UK-native providers with domestic infrastructure and UK-based support. US-headquartered providers like RingCentral and 8x8 have UK operations and comply with UK regulatory requirements, but support and infrastructure are not exclusively UK-based.
Vodafone One Net is a fixed-mobile convergence product that gives employees a single number for both desk and mobile calls. It is well-suited to businesses with significant mobile working requirements and is typically bundled with Vodafone mobile contracts. It is a Vodafone proprietary product rather than a standard hosted VoIP system.
Zoom Phone is growing its UK presence and is a reasonable choice for businesses already using Zoom Meetings heavily. The integration between Zoom Phone and Zoom Meetings is smooth. However, it has fewer advanced telephony features than mature hosted PBX platforms like Gamma Horizon or 3CX, and its UK carrier relationships are less established.
A SIP trunk provider supplies IP-based phone lines that connect an on-premise PBX to the public telephone network via the internet. SIP trunks replace ISDN30 lines and allow businesses with existing PBX hardware to retain it while migrating away from ISDN. Gamma Carrier, Gradwell, and AAISP are established UK SIP trunk providers.
Related Reading
Comparison of the Top UK VoIP Providers | AMVIA 2025
Side-by-side comparison of the leading UK VoIP providers for business.
5 Best Business VoIP Phone Systems | UK Comparison
AMVIA's ranked list of the five best VoIP platforms for UK businesses.
Choosing the Best Business VoIP Providers | Buyer's Guide
A step-by-step guide to evaluating and selecting the right VoIP provider for your business.