UK VoIP Provider Comparison | Business Plans & Pricing

UK VoIP Provider Comparison Overview

The UK business VoIP market is well-served by both UK-native carriers and international UCaaS platforms with UK operations. Prices have become more competitive as the market has matured. This comparison covers pricing, plan structure, and key differentiators for the providers most commonly evaluated by UK SMEs.

Gamma Horizon

Plan Structure

Gamma Horizon is available through reseller partners (not direct to business) and is typically offered in two to three plan tiers:

• Standard: Core hosted PBX, auto-attendant, hunt groups, voicemail, mobile app — approximately £12–£14/user/month
• Professional: Adds call recording, analytics, Teams integration — approximately £15–£17/user/month
• Contact Centre add-on: Queue management, wallboards, supervisor tools — available as additional per-user charge

Unlimited UK landline and mobile calls typically included across all tiers. Numbers included; additional numbers available from £1–£2/month each.

3CX

Plan Structure

3CX pricing is based on simultaneous calls (concurrent calls) rather than user count, which can be advantageous for businesses with a high user-to-call ratio:

• Small (4 concurrent calls): From approximately £8/user/month on an annual hosted plan
• Medium (8 concurrent calls): From approximately £11/user/month
• Enterprise (unlimited calls): Annual licence, hosted — approximately £14/user/month at 25 users

Call charges are separate (billed through a SIP carrier), which allows businesses to choose a carrier separately. This adds flexibility but requires managing two vendors.

RingCentral

Plan Structure

RingCentral offers a clear tiered structure across its MVP (Message, Video, Phone) platform:

• Core: Business VoIP and messaging — approximately £15–£18/user/month
• Advanced: Adds call recording, analytics, integrations — approximately £19–£23/user/month
• Ultra: Full enterprise suite, device analytics, unlimited storage — approximately £23–£27/user/month

Unlimited UK calls included on all tiers. International calls to 40+ countries at set rates on higher plans.

Microsoft Teams Phone

Plan Structure

Microsoft Teams Phone licensing is separate from standard Microsoft 365 plans and requires an additional per-user add-on:

• Teams Phone Standard licence: Approximately £6–£12/user/month depending on M365 plan
• Microsoft Domestic Calling Plan: Approximately £5.50–£9/user/month (includes set number of UK minutes)
• Operator Connect / Direct Routing: Alternative to Microsoft's calling plans; carrier pricing varies, typically £5–£8/user/month

Total Teams Phone cost is typically £11–£21/user/month when combining licence and calling capability.

8x8

Plan Structure

8x8's X-series plans scale from basic VoIP to full contact centre:

• X2 (basic UCaaS): VoIP, video, messaging — approximately £12–£15/user/month
• X4 (mid-market): Call analytics, supervisor tools — approximately £18–£22/user/month
• X6–X8 (contact centre): Full CCaaS capability — from £80+/agent/month

Summary Comparison

• Lowest cost: 3CX (from £8/user) or Teams Phone at basic licence level
• Best UK carrier quality: Gamma Horizon
• Best integrations: RingCentral
• Best for Microsoft 365: Teams Phone
• Best contact centre: 8x8 or RingCentral

AMVIA can provide current pricing for each platform based on your specific user count and requirements — prices shown are indicative ranges and may vary.