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Gamma Telecom Reviews 2026: Business VoIP, Mobile and Alternatives

Gamma Telecom Reviews 2026: Business VoIP, Mobile and Alternatives

You Might Already Be Using Gamma Without Knowing It

Here is something that surprises most business owners: if you have a cloud phone system or hosted VoIP in the UK, there is a reasonable chance it runs on Gamma's technology. Your provider might be called something completely different. Your bills might come from a local IT company or a managed service provider. But underneath, the platform handling your calls could very well be Gamma's Horizon.

Gamma does not sell directly to most businesses. They sell through a network of channel partners, resellers and managed service providers. Those partners put their own name on it, set their own prices, and provide their own level of support. Gamma provides the underlying technology.

This is not unusual in telecoms. It is how a large portion of the UK's business phone infrastructure works. But it means the question is not really "is Gamma good?" The question is: "is the partner selling you Gamma good?" And that is a much harder question to answer.

Based on our experience helping over 2,000 businesses with their telecoms since 2008, we estimate that roughly 25% of the small and medium businesses we speak to are already running on Gamma infrastructure without realising it. They call their provider one name, but the VoIP platform, the SIP trunks, the underlying connectivity is Gamma.

We are not here to tell you Gamma is bad. Gamma makes some of the best VoIP technology in the UK. We are here to help you understand how the partner model affects your experience and your pricing, and to make sure your business mobiles are on the right network regardless of who provides your phone system.

We are Compare The Networks, an independent, OFCOM-regulated comparison service rated 4.3/5 on Trustpilot from over 1,000 reviews. We compare EE, Vodafone, O2 and Three side by side, completely free.

Understanding Gamma's Partner Model: Why It Matters for Your Business

Gamma is listed on the London Stock Exchange and headquartered in Newbury, Berkshire. They are a serious company with serious technology. Their Horizon hosted VoIP platform is used by tens of thousands of UK businesses and is widely regarded as one of the most reliable in the market.

But here is how their model actually works in practice:

Gamma builds the technology. A channel partner sells it to you. The partner sets their own price, which includes Gamma's wholesale cost plus whatever margin the partner decides to add. The partner provides your day-to-day support. Gamma stays in the background.

This means two businesses on the exact same Gamma Horizon platform, with the exact same features and the exact same call quality, could be paying very different prices depending on which partner sold it to them. Partner A might charge £15 per user per month. Partner B might charge £25 for the same thing. You would never know unless you compared.

It also means your customer service experience is entirely dependent on the partner, not on Gamma. A brilliant partner with a responsive support team makes Gamma feel like a premium product. A disorganised partner with slow response times makes Gamma feel like a headache. The technology underneath is identical in both cases.

Gamma's Product Range: What They Actually Provide

Gamma's technology covers the core of modern business communications:

  • Horizon hosted VoIP --- their flagship cloud phone system, widely used across the UK, with call routing, auto-attendant, call recording and CRM integration
  • SIP trunking --- connecting existing PBX systems to voice-over-IP
  • Business mobile --- available through partners, though not Gamma's primary strength
  • Business broadband and connectivity --- fibre, Ethernet and SD-WAN
  • Microsoft Teams integration --- direct routing for Teams calling, one of the better implementations in the UK
  • UCaaS --- unified communications platforms combining voice, messaging and collaboration

The technology is genuinely good. Gamma invests heavily in development, and their Horizon platform competes with anything else in the UK VoIP market for features and reliability.

The Two Questions You Should Be Asking About Gamma

Question 1: Is Your Partner Any Good?

Since Gamma sells through partners, the partner is everything. Here is what we hear from businesses that come to us:

When the partner is good: Customers praise responsive support, knowledgeable technicians, smooth setup, proactive account management, and reliable service. These customers tend to be very happy and see no reason to change.

When the partner is not good: Customers describe slow support, difficulty getting issues resolved, unexpected charges, and a general feeling that the partner is more interested in selling than supporting. These customers are frustrated, and their frustration gets directed at "Gamma" even though Gamma the company may be unaware of the problem.

The challenge is that you often do not know how good your partner is until something goes wrong. The sales process might be polished, but support quality only reveals itself when you need help urgently and discover whether your partner picks up the phone.

Question 2: What Are You Actually Paying?

Because pricing goes through a partner, there is no public Gamma price list for end customers. Different partners charge different margins. The same Horizon seat that costs you £20 per month through one partner might cost £12 through another, with identical features and identical underlying technology.

This is where independent comparison becomes valuable. Not necessarily to compare Gamma against other VoIP platforms (although we can do that), but to ensure that whatever you are paying for your business communications as a whole is competitive.

We typically find that businesses who have never compared their telecoms spend across the full market are paying 15% to 25% more than they need to, based on our experience since 2008. The savings come from competitive pressure, better network matching, and transparency about what things actually cost.

Where Gamma Fits and Where It Does Not

Gamma Excels At VoIP

If your primary need is a reliable, feature-rich business phone system, Gamma's Horizon platform is one of the best options in the UK. The technology is proven, the feature set is comprehensive, and the platform scales from small businesses to large enterprises. If you have found a good partner to deliver it, this is a strong setup.

Gamma Is Not a Mobile Specialist

Business mobile is offered through Gamma's partners, but it is not Gamma's core competency. The mobile deals available through a Gamma partner may be limited to specific networks, and the pricing is unlikely to be as competitive as what you would get by comparing all four major networks independently.

Based on our experience, approximately 30% of businesses that come to us while already using Gamma for VoIP are specifically looking for better business mobile deals. They are happy with their phone system but know their mobile contracts could be sharper. This is a natural combination: keep Gamma for VoIP, but compare EE, Vodafone, O2 and Three independently for your mobiles.

The Partner Layer Adds Cost

Every intermediary adds margin. When you buy Gamma through a partner, you are paying Gamma's wholesale price plus the partner's margin. When you compare mobile deals through us, you are comparing direct network pricing with no intermediary markup. This is why businesses that separate their VoIP provider from their mobile provider often find the total cost is lower than bundling everything through a single partner.

Gamma vs Compare The Networks: Different Strengths, Complementary Services

This is not a like-for-like comparison. Gamma and Compare The Networks do different things, and many businesses use both.

Gamma (through a partner) provides your VoIP phone system. Horizon is excellent technology, and if you need a cloud phone system, it belongs on your shortlist.

We compare your business mobile deals. We check coverage across EE, Vodafone, O2 and Three at your postcodes and find the best combination of network, data and pricing for your team.

The ideal setup for many businesses is to choose the best VoIP provider for their phone system (which might be Gamma) and separately compare their business mobiles through us to make sure they are on the right network at the right price. These two things do not need to come from the same company, and they often should not.

When we compare for businesses already on Gamma VoIP, we focus purely on the mobile side. Business mobiles from £11 per month ex VAT across all four networks, with coverage checked at every postcode where the team operates.

What You Get Through Compare The Networks

  • Free comparison across EE, Vodafone, O2 and Three for business mobiles
  • Postcode-level coverage check across all four networks
  • Business mobiles from £11 per month ex VAT, SIM only or with handsets
  • VoIP comparison if you want to benchmark your current setup, from £20 per month ex VAT
  • Virtual landlines from £10 per month ex VAT and business broadband (SOGEA) comparisons
  • No cost to you --- the networks pay us, not you
  • OFCOM-regulated and ICO registered since 2008
  • 4.3/5 on Trustpilot from over 1,000 verified reviews
  • Direct service with no intermediary and no partner variability

Ten minutes. Free. No obligation. Whether you want to keep Gamma for VoIP and just sort your mobiles, or compare everything from scratch, we can help.

Frequently Asked Questions

Is Gamma Telecom a good company?

Gamma is widely respected in the telecoms industry for the quality of their technology, particularly their Horizon hosted VoIP platform. They are a publicly listed company with a strong financial position. The customer experience depends significantly on which channel partner delivers the service. For VoIP and hosted telephony, Gamma's products are among the best in the UK market.

Does Gamma sell directly to businesses?

Gamma primarily sells through a network of channel partners and resellers. This means you typically deal with a Gamma partner rather than Gamma directly. The quality of your experience will depend on the partner you choose, so researching potential partners is as important as researching Gamma's products.

What is Gamma Horizon?

Horizon is Gamma's flagship hosted VoIP platform. It provides cloud-based business phone systems with features including call management, auto-attendant, call recording, mobile apps and CRM integration. It is one of the most widely deployed hosted VoIP platforms in the UK.

Does Gamma offer business mobiles?

Gamma does offer business mobile services through their channel partners. However, mobile is not their primary product focus. Businesses whose main need is business mobiles may find better deals and more network choice by comparing directly across EE, Vodafone, O2 and Three.

How does Compare The Networks differ from Gamma?

We are an independent comparison service, not a telecoms provider or wholesaler. We compare deals directly from EE, Vodafone, O2 and Three and recommend the best option for your business. Gamma is a technology provider that sells primarily through partners. Our focus is getting you the best mobile deal across the whole market.

Is Compare The Networks free?

Yes, completely. The networks pay us a commission when you take a deal through us. You pay the same as going direct to the network, or less. We never charge a fee.

Get a Free Comparison Today

Whether you are evaluating Gamma, already using Gamma products through a partner, or simply want to make sure your business mobiles are on the best available deal, we can help.

Get a free quote and we will compare your options across EE, Vodafone, O2 and Three. It takes about 10 minutes, it is completely free, and there is no obligation.

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