A business replacing an old phone system usually starts with a choice between a basic virtual line, a full cloud PBX and a broader communications platform. The lowest advertised price can look attractive, but it may not include the handsets, call handling, support or connectivity changes the organisation needs. For a reseller, the margin on the licence matters too, as do customer ownership, implementation effort and who takes the first call when something goes wrong.

This comparison considers published pricing, contract flexibility, UK support, number and device options, scalability, partner delivery and the work required to implement and support each service. Hosted VoIP can fit a small office, a multi-site organisation or a reseller's portfolio, but the right choice depends on call volumes, existing equipment, integrations and whether the provider supports a partner-led or white-label model.

The UK market is already well into its move away from legacy voice. Ofcom reported that managed VoIP represented approximately 58% of measured UK business fixed-voice connections at the end of September 2023, while BT planned to retire the PSTN by December 2025, with other providers using the same legacy technology following broadly similar timescales. Those figures make migration planning, number portability, service continuity and emergency calling practical procurement issues, not afterthoughts. Ofcom's PSTN switch-over information

For service providers, hosted VoIP is also more than a licence resale. UK fixed-voice revenues and usage have been declining, so providers need to consider the value of related services such as managed configuration, resilience, mobile integration and security support, rather than relying only on voice usage. Ofcom's telecommunications market data update

1. RingCentral

RingCentral suits organisations that want more than dial tone. Its cloud communications platform brings business calling together with video meetings, messaging and integrations, which can reduce the need to manage separate tools for each function. Users can work through desktop and mobile apps or supported desk phones, with call routing, voicemail, call management and analytics available across the service.

That breadth is useful for growing firms, distributed teams and organisations with several sites. CRM integrations can connect calls to existing customer workflows, while larger organisations can assess options for contact-centre requirements. The trade-off is that a broad feature set can make package comparisons less direct. The right plan depends on users, features and contract terms, so request a UK quote against an agreed list of requirements rather than comparing headline figures alone.

Commercial consideration: A larger platform can simplify administration, but only if staff use the functions they're paying for. Identify the call flows and integrations the business will actually deploy before selecting a tier.

For resellers, establish who owns onboarding, first-line support and changes to routing. Also review current security and incident communications as part of supplier due diligence. GoSafe has discussed the RingCentral extortion claim details, which is useful context for a wider conversation about how providers communicate security issues. It shouldn't replace a direct review of the supplier's current controls, contract and incident process.

2. 8×8

If international operations are part of the buying decision, 8×8 merits a closer look. Its platform combines cloud calling with messaging, meetings, analytics and contact-centre products. The 8×8 Work app supports desktop and mobile calling, and UK service information describes domestic calling plans, with international calling available on some tiers.

The advantage is a potential route from business telephony into broader collaboration and customer-service operations without treating each requirement as a separate purchase. Phone-number availability across many countries may also be relevant to organisations supporting overseas teams or customers. However, the value of international calling depends on the selected plan and destinations. A business with straightforward UK call handling may pay for capability it won't use.

Check the commercial fit

Pricing is sales-led, so prepare a realistic usage profile before requesting a proposal. Include expected users, destinations, call volumes, contact-centre needs and any planned integrations. Then ask the provider to separate included features from optional services and clarify how support works across the UK and other locations.

For MSPs and telecom resellers, a customer's communications account is also an identity and access concern. A useful related discussion is how a GoSafe white-label cyber risk platform could sit alongside connectivity and voice services. Keep the roles clear: hosted VoIP supports calls and collaboration, while dark web monitoring is a distinct security service that can alert customers to exposed credentials.

3. Gamma Horizon

Gamma Horizon is a UK-focused hosted PBX option for organisations replacing or complementing an on-premises phone system. It supports multi-site and flexible-working arrangements, with fixed and mobile telephony management. Horizon Collaborate adds messaging, presence, voice and video for businesses that want more than a hosted switchboard.

Gamma is commonly delivered through partners, making the quality of the reseller relationship central to the buying decision. That channel model can work well for a business that wants local implementation and ongoing support from a telecoms provider or MSP. It also means buyers should establish exactly which organisation handles provisioning, user changes, troubleshooting and escalation.

Get the package defined

Pricing is generally partner- or quote-led, so compare the service description rather than assuming that a product name means the same package everywhere. Confirm which call-management features are included, how collaboration functions are licensed and whether devices or implementation services are separate.

A hosted PBX removes the need to maintain an on-site phone system, but it doesn't remove the need to plan call flows, network readiness and support ownership.

For resellers, clarify customer ownership and the division of responsibilities before signing. A healthy channel model should leave room for recurring service revenue without making the partner absorb open-ended support work. Ask about margin structure, wholesale billing, number porting, fault escalation and what the provider expects the reseller to manage after launch. Buyers should also test the support arrangement with practical scenarios, such as a user needing a call route changed or a site experiencing connectivity trouble.

4. BT Cloud Voice

BT Cloud Voice offers growing SMEs a familiar UK supplier and a managed phone service with a business portal. Its licence levels, Basic, Connect and Collaborate, let organisations assign different feature sets to different users. Calling features include routing, transfers and voicemail, while shared UK minute bundles and unlimited UK calling are among the advertised options.

BT publishes licence prices, which helps with initial budgeting. But the listed licences use a 60-month term, and BT's product information specifies annual price increases. That long commitment deserves close attention if the business expects staffing, sites or service requirements to change. Calling packages and extras can also affect the total cost, so compare a complete quote rather than the licence alone.

Model the commitment

Ask for the full contract schedule, including price-adjustment terms, cancellation conditions, hardware and any installation costs. A long term can provide predictability, but it can also limit flexibility if the organisation needs to change suppliers or reshape its phone estate.

BT advertises 24/7 UK-based support. Buyers should still check which support routes apply to their package and whether the support team covers the network, handsets and call configuration they're purchasing. Resellers should confirm their role in service changes and fault handling, rather than assuming the supplier's support proposition removes all partner workload. For providers looking beyond voice resale, new revenue streams for telecoms can include complementary managed services, provided the offer is relevant to the customer and clearly scoped.

5. Vonage Business Communications

Vonage Business Communications provides tiered cloud communications plans for UK businesses. It can suit teams that need business calling and collaboration tools, with capabilities varying by plan. The published plan structure gives buyers a starting point for comparing feature levels, while supported locations may offer virtual-number options.

The main procurement task is to verify what the selected tier includes. Higher-level features can increase costs, and the headline plan may not cover every add-on, implementation need or call destination. Number availability and rates should be checked for the locations the business serves, particularly if it expects to use international numbers or make substantial overseas calls.

A sensible comparison starts with users and workflows. List who needs a desk phone, who will use a mobile or desktop app, and whether teams need call routing, collaboration features or integrations. Then ask Vonage to map those needs to a package and identify any charges outside the recurring licence.

For a reseller, the platform's tier structure may make it easier to align service levels to customer requirements, but the economics depend on the partner terms and support workload. Don't assume that a recognised business communications product automatically produces a workable reseller margin. Check whether you can bill monthly, manage customer changes, retain the customer relationship and get timely help with number porting or faults. If the customer needs only a basic virtual line, a broader plan may be more system than it needs.

6. Dialpad

Dialpad takes an app-led approach, combining business calling with messaging and video meetings. Users can call from desktop, mobile and tablet apps, which can reduce reliance on desk-phone hardware for hybrid or distributed teams. The platform also promotes AI-related call capabilities, but availability varies by plan and should be verified for a UK deployment.

This can be a practical fit where staff work across locations and prefer software-based calling. It may also appeal to teams that want voice and collaboration functions in the same environment. The trade-off is that app-first convenience doesn't remove the need to test the underlying network. Average download speed alone won't tell you whether voice performs well during busy periods or on congested Wi-Fi.

Validate the UK details

Confirm which plans include the features the business expects to use, and check UK number, calling and SMS arrangements directly. More complex telephony requirements may require a higher-tier package, so put call routing, queues, devices and integrations into the quote request.

Network test: Trial calls using the actual office network and remote-user connections. Check performance during normal working conditions, not just in a quiet test.

Providers and MSPs should also agree who monitors service quality and handles faults that cross the boundary between the cloud platform and customer connectivity. Ofcom's UK VoIP guidance notes that services providing calls to and from ordinary numbers, including emergency-service access, may fall within the definition of a Publicly Available Telephone Service, with obligations that depend on the provider's role. Ofcom's VoIP guidance Buyers and resellers should document responsibility for numbering, routing, emergency access and customer communications.

7. Aircall

Aircall focuses on business telephony for sales and customer-facing teams. Its offer includes business-application integrations, call routing and call-management functions, with analytics and additional conversation tools on higher tiers. UK numbers are included in listed plans, and the UK pricing page gives buyers a basis for an initial comparison.

There's an important size constraint for smaller firms: Essentials and Professional require at least three licences. A one- or two-person business may therefore find the effective per-user cost less attractive than the headline price suggests. Enterprise pricing is custom, and usage limits should be checked before committing.

Start with the call workflow

Aircall's focus is most useful when calls are part of a defined sales or support process. Map how calls should reach the right person, what happens when teams are busy and which integrations need to receive call information. Then compare those requirements with the selected plan, including any analytics or conversation tools the team expects to use.

For a reseller, per-user pricing can make costs relatively easy to model, but it can also squeeze margins for smaller accounts if minimum licence requirements apply. Confirm customer eligibility, billing terms and the effort involved in configuration and ongoing changes. A product that fits a call-heavy team may be unnecessarily expensive for a business that mainly needs a main number, voicemail and basic routing.

8. VoiceHost Hosted PBX

VoiceHost Hosted PBX is a UK option for businesses that want a choice of apps and compatible SIP phones. It supports UK geographic and non-geographic numbers, international numbers, number porting from many networks, CRM connectors and API access. The provider advertises no minimum term for its main service and publishes entry-level pricing, which gives smaller firms a more flexible starting point.

That flexibility is useful when a business is testing hosted PBX or doesn't want to commit to a long contract before the call flows are proven. Still, the entry price is only one part of the cost. Bundles, call charges and optional features can change the total, and some services may have separate terms.

Before signing: Ask for the complete price breakdown and written support expectations, including how quickly faults are acknowledged and which changes are included.

SIP handset compatibility is valuable for businesses that want physical phones, but confirm the exact device requirements before reusing existing equipment. Resellers should also check whether number porting, CRM work and API access are included or billable. A flexible contract can help a partner serve customers with changing requirements, but it doesn't by itself establish a profitable recurring service. Calculate the time required for onboarding, user support and billing alongside the wholesale cost.

9. Yay.com

Yay.com provides a cloud PBX with desktop and mobile apps, call routing and business numbers. It supports a range of devices, including IP phones, and presents its service as a monthly, no-contract option. A free 14-day trial is listed on the UK Government Digital Marketplace, giving prospective customers a chance to test the service before committing.

The trial is most useful when treated as a small implementation exercise, not just a feature tour. Test the main number, user setup, call routing, voicemail and the devices staff will use. Confirm whether the trial terms match the intended UK purchase and whether any settings or numbers need to be recreated after the trial ends.

Check the real monthly cost

Verify currency, billing terms, included minutes, numbers and call rates. Add-ons and plan choices can alter the effective price, so compare the package against expected usage rather than assuming that monthly billing means low total cost.

For a small business, no-contract positioning can reduce procurement risk. For an MSP or telecom reseller, it may also support a more flexible customer offer, but partner economics and support arrangements still need to be confirmed. Ask who owns the customer account, whether you can manage users on the customer's behalf and how faults are escalated. A short trial can surface usability issues, but it won't prove how a provider handles a difficult outage or a complex porting request. Use the evaluation to document those questions before rollout.

10. NFON

NFON combines cloud telephony and SIP trunking with voice and video capabilities across devices. It also promotes AI and automation features and highlights redundant server architecture. NFON states 99.9% system availability; buyers should treat this as a provider-stated figure and ask which service, measurement period, exclusions and remedies apply in the relevant UK service-level agreement.

Having cloud PBX and SIP trunking from one supplier may suit an organisation comparing a full move to hosted telephony with a route to connect existing equipment. That flexibility can help with phased migration, but the design needs to account for what remains on-site and who supports it.

Ask for the terms behind the claim

Public pricing isn't readily displayed, so request a proposal that separates licences, implementation, support and optional collaboration or AI capabilities. Check whether features are bundled or sold separately, and confirm the applicable service-level and support terms for each part of the deployment.

NFON may be worth considering for businesses evaluating European providers with a UK presence, especially where SIP trunking matters. For a reseller, quote-led pricing makes it important to understand the margin, renewal terms and customer handover process before presenting a final offer. Don't base a resilience decision on an availability statement alone. Review the customer's broadband, power, network equipment and fallback arrangements as well as the provider's infrastructure.

Top 10 Hosted VoIP Providers Comparison

Matching VoIP to Your Service Model

There isn't a universal winner among hosted VoIP providers. A small team that values flexibility should first compare clear monthly terms, included numbers and call charges. Established SMEs may prefer a familiar support route and predictable licence structure, while growing and multi-site organisations should test administration, integrations and collaboration across locations. Businesses with contact-centre needs should put routing, queues and analytics ahead of a long feature list that doesn't match their call volumes.

Resellers need a separate commercial evaluation. A product can be sound for end users but still be difficult to sell profitably if the provider controls the customer relationship or leaves the partner to absorb complex support work. Before signing, establish:

• Wholesale margin and recurring billing: Confirm how the partner earns revenue, how customer invoices are handled and whether recurring charges are predictable.
• Customer ownership and white-label options: Check who controls the account, customer communications and renewal, and whether you can present the service under your own brand.
• Migration and number porting: Assign responsibility for number records, cutover planning, testing and fallback arrangements.
• Support escalation: Define who handles user questions, call-quality complaints, provider faults and urgent incidents.
• Hidden costs: Include hardware, implementation, add-ons, international calls and network changes in the commercial model.

The technical plan matters just as much. Ofcom warns that VoIP emergency access can cease during a power cut, internet failure or failure of the connection on which the service depends. Providers must explain this limitation during sales, in contractual terms and in user guidance, so confirm how the customer will maintain access through measures such as battery backup, alternative connectivity or mobile fallback where appropriate. Ofcom's emergency-calling guidance for VoIP providers

VoIP providers, MSPs and telecom resellers can also add a distinct security service to their portfolio. GoSafe is a white-label Dark Web Monitoring tool that continuously scans for compromised email addresses, exposed passwords and breached domains, then sends clear alerts that business users can understand. Partners can sell dark web monitoring under their own brand as a monthly service, without building the tool internally or needing a specialist security team. That can create a practical customer conversation alongside connectivity, IT support and telecom systems.

To explore the partner model, view the GoSafe Reseller Programme and learn how to offer white-label dark web monitoring as a recurring service. For customer-facing organisations evaluating call handling more broadly, a virtual receptionist for law firms is another example of a complementary service to assess against specific client workflows.

GoSafe is a fully white-label Dark Web Monitoring tool that helps service providers alert customers to exposed credentials and breached domains with clear, actionable notices. Add it alongside hosted VoIP and related services, then visit GoSafe Dark Web monitoring to learn more.