VoIP Phone Systems for Small Businesses | UK Guide

VoIP for Small Businesses: Why It Makes Particular Sense

Small businesses arguably benefit more from VoIP than larger organisations. An enterprise with a dedicated IT team and budget for complex PBX infrastructure was always able to access professional telephony. For small businesses — two people sharing an office, a growing five-person team, or a 15-user SME without dedicated IT — VoIP delivers enterprise-grade phone functionality at a fraction of what it used to cost.

The barrier to entry is now genuinely low. A two-user hosted VoIP system from a reputable provider costs approximately £16–£24 per month. That gets you: business phone numbers, professional auto-attendant, call recording, voicemail to email, and a mobile app. For a small business trying to present a credible professional image, this is transformative.

What Small Businesses Need from a VoIP System

Based on the most common requirements from small UK businesses, the key capabilities are:

• Professional inbound call handling: Auto-attendant and call routing so calls are handled professionally even when the team is busy
• Work from anywhere: Mobile app so staff can use their business number from wherever they are working
• Low cost: Per-user cost that scales with the team — no large upfront commitment
• Simple management: Online portal for making changes without IT knowledge
• Reliability: Calls that work consistently, without dropouts or quality issues

Best VoIP Options for Small UK Businesses

Gamma Horizon (via a reseller)

Available through managed IT providers, Gamma Horizon provides carrier-grade reliability at £12–£18/user/month. For small businesses wanting a fully managed service with account management, this is a strong choice. The reseller handles all setup and ongoing support.

3CX

For small businesses with basic IT capability (or a managed IT provider), 3CX provides full-featured hosted VoIP from around £8/user/month. Very cost-effective for small user counts, with a good mobile app and straightforward management portal.

Microsoft Teams Phone

For small businesses already using Microsoft 365, Teams Phone is the most logical choice. Adding a Teams Phone licence (£6–£12/user/month) and a calling plan (£5–£9/user/month) turns Teams into a complete phone system — no separate app required. Particularly valuable if the business is already paying for Microsoft 365 Business Premium.

bOnline

A UK provider specifically targeting small businesses and sole traders. Simple setup with competitive pricing from approximately £8/user/month. Less feature depth than Gamma or 3CX, but adequate for businesses with basic requirements and minimal IT overhead.

What to Avoid as a Small Business

• Overpaying for unused features: Enterprise-tier plans at £20–£25/user/month include contact centre features most small businesses will never use. An entry or mid-tier plan covers the vast majority of small business requirements.
• Consumer VoIP services: Consumer apps like Skype for Business (discontinued) or personal mobile VoIP apps are not appropriate for business use — they lack reliability, professional features, and number portability.
• Over-investing in hardware: Many small businesses run entirely on softphone apps and mobile apps with no desk phones at all. If your team works largely from laptops or mobiles, hardware investment may be unnecessary.

Getting Started

For a small business, the switch to VoIP is typically a straightforward process: choose a provider, set up the account and configure extensions, port any existing numbers (5–10 days), and point staff to the app. AMVIA can handle this end-to-end and provide ongoing support for businesses that do not want to manage their phone system themselves.