Best All-Round
Gamma Horizon
Gamma Horizon

Gamma Horizon is by far the best fit for small businesses in the UK. It's got all the features and functionality you could need, and best of all, it requires little or no management. If you're looking for a VoIP phone system for your business, look no further. 

Phone system highlights:

  • From only £9.95 per user per month (Standard plan)
  • 2000 free UK landline minutes per user
  • 2000 free UK mobile minutes per user
  • Unlimited VoIP phone numbers
  • Take business calls on your mobile
  • Voicemail-to-email
  • Music-on-hold (can be used for prerecorded marketing messages)
  • Virtual receptionist
  • Call waiting and queuing
  • Excellent choice of IP handsets
  • Call recording
  • CRM integration
  • Excellent support via authorised partners
  • Plus many more features and benefits
Most Flexible

3CX is, without doubt, the most flexible phone system on our list as you have complete control over where it is installed. It could be that it's set up on your premises on a computer or server, or perhaps in the cloud, the choice is yours. If you're looking for a customised solution for your small business and don't mind having to pay separately for things like SIP trunks, then 3CX could be a good fit.

Phone system highlights:

  • Pricing is dependent on where you host the system
  • Host onsite with Linux or Windows
  • Host in the cloud with Amazon, Google, or Azure
  • Choice of SIP trunk provider
  • Excellent virtual receptionist
  • Extensive feature-set
  • Supports ALL IP phones
  • Modern Android and iOS apps
  • Make calls from web and Windows
  • Includes instant messaging
  • Excellent video calling
  • Highly rated system
  • Excellent support from 3CX partners
Landline Replacement

Phoneline+ is brilliant for micro-businesses, that are either looking to replace their existing landline or want a virtual number that they can answer anywhere. It doesn't have all of the features of the others on this list, but its brilliance is its simplicity and ease of use for businesses that only have one or two users. 

Phone system highlights:

  • From only £9.99 per month
  • Unlimited calls to UK landlines
  • Unlimited calls to UK mobiles
  • Time of day call routing
  • Contact management
  • Desktop softphone
  • Mobile app to take calls anywhere
  • Voicemail to email
  • Free setup and number transfer
  • Award-winning phone system
  • Excellent support from UK partners


bOnline bOnline

bOnline's VoIP phone system is an excellent choice if you're a UK based small business. It's competitively priced and packed full of features. Perhaps the only disappointing part is that they currently only offer their service direct, which means you can't benefit from the excellent service levels often provided by local telecoms companies.

Phone system highlights:

  • From £12.95 per user per month (Unlimited plan)
  • Call menus / virtual receptionist
  • Call forwarding and call routing
  • Call Recording
  • Voicemail to email
  • Contact Syncing
  • Business hours routing
  • Local or national number
  • Global company
  • UK based company
Lily Comms Lily Comms

Lily Comms' cloud VoIP phone system is another top choice for businesses in the UK. It's got plenty of features and the company has a very good track record too. 

Phone system highlights:

  • Audio and video conferencing
  • Web collaboration
  • Instant messaging
  • Outlook integration
  • Call recording
  • Auto-attendant (virtual receptionist)
  • Easy configuration
Orange divider

If you read our recent article "What is VoIP", you'll already have a comprehensive understanding of what it is, how it works and how it can benefit your business, but for those of you that are new to our website, VoIP is an acronym for voice over internet protocol, which is a technical way of saying telephone calls that are connected via the internet.

In years gone by, your telephone calls would either have been sent over an analogue telephone line or via ISDN, with the first being the most common form and the latter tending to be used by slightly larger businesses.

Small business owner using VoIP phone system
Small business VoIP systems can deliver huge savings in comparison to traditional phone services.

What is needed for a VoIP phone system?

You'll be surprised to know that you need relatively little for a VoIP phone system - you don't need to buy expensive hardware for instance. First, and most importantly, you need a VoIP system, with the most common option being to pay for a cloud-hosted service such as our Horizon platform. By renting a hosted VoIP system, rather than buying the equipment yourself, you place all of the responsibility for the maintenance and upkeep of the system on the provider. So rather than having to host your own equipment and paying for it to be maintained, you can just pay a monthly fee and access a range of advanced features.

In addition to the system itself, you only need two other things, an internet connection and an internet-connected device to make the calls. When we say internet-connect device, we mean one or more of the following:

  • A VoIP handset
  • A Smartphone
  • A laptop or computer with a microphone

Chances are you already have a suitable device to make calls, and with over 95% of us in the UK having internet access, it's more than likely you have an internet connection too - you're reading this article after all! So the only thing you're missing is a VoIP system, which as we've mentioned, you can get for a very affordable monthly cost.

Is VoIP good for small business?

Yes, VoIP is brilliant for small business - in our opinion, it's a game-changer. Similarly to the evolution of other cloud technologies such as Dropbox or Microsoft Office 365, cloud-hosted VoIP gives small businesses access to enterprise-grade technology for a low monthly cost.

Benefits of VoIP for a small business?

There is a huge range of benefits of VoIP to small businesses including:

Lower costs

Small businesses are always keen to minimise costs, so the good news is that by implementing a VoIP phone system many of your telephony related costs will be reduced. Firstly, there is no longer the need for expensive ISDN business phone lines, which BT are phasing out by 2025 anyway. Secondly, as the system is hosted in the cloud, there's no expensive equipment to buy or finance, it's all included in your monthly service subscription fee. Finally, as calls are routed over the internet, they are almost always cheaper than calls made via traditional phone services. Many VoIP phone system providers, including ourselves, even include free calls with most packages. Finally, you don't have to have a VoIP handset, but if you do opt for one with us, you can choose between the excellent Polycom VVX450, the Yealink W52P cordless handset, or indeed a softphone, for free!

Increased accessibility/flexibility over where you work

Aside from the cost savings associated with VoIP, the ability to work from anywhere in the world, as long as you have an internet connection, has to be one of the primary benefits. At the time of writing the world is still struggling to cope with the Covid-19 pandemic, and in the UK employees are being told to work from home where they can. With traditional phone systems, making that switch from office to home working isn't easy and ultimately results in call forwarding and extra costs. With a cloud VoIP system, you can work from anywhere, all you need is a device that can make and receive calls and you're away. Central to this is the ability to take your phone number with you wherever you are. Your office may have a geographic or non-geographic number, but with VoIP it doesn't matter, you can pick up your number from the comfort of your own home or even on your mobile device while you're out and about.

Our Gamma Horizon platform comes with both Android and iOS apps so you can make and receive calls on your smartphone from anywhere. The flexibility that a hosted VoIP gives you is truly a significant benefit.

Joining T2K is one of the best if not the best business decisions we've made.
Paul Crisell - Vale Veterinary Clinic
on Google

Improved Portability

We touched on portability in the last benefit, but essentially by having a cloud VoIP system you can use the same telephone number anywhere. You can give the impression you're in the office while you're actually sitting in a far-flung exotic location, or perhaps just your home office. This truly is the world of unified communications.


For start-ups and small businesses, you want to make sure that the telephony solution that you choose today fits you tomorrow and far beyond too. The last thing you want to be doing is changing your phone system after only a couple of years. The great thing with internet hosted VoIP phone systems, such as our own Horizon service, is that they are scalable. Our own platform, for instance, can scale up to thousands of users, so you can rest assured that as your business grows your phone system will keep up.

Numerous helpful features

We'll get into the detail of the features our Horizon platform provides a bit later in this article, but it's safe to say - they are extensive. If you have a traditional phone service, you'd either need to pay for an expensive controller to access advanced features or suffer from limited and basic controls. With cloud-hosted VoIP you can do everything from call recording to music on hold with a few clicks of a button. Yes, certain features come at a premium, but rather than needing to buy the latest and greatest hardware, you'd merely need to upgrade your subscription to access them. Small businesses today can present a professional impression and belie their size using cloud-based technologies such as VoIP.

Improved voice quality

When VoIP was first developed and internet connections were slower and less reliable, calls often suffered from dropouts and poor quality, but in the last few years as internet connections have improved, the quality of VoIP calls has surpassed that of traditional phone systems. When there's an office of people using our Horizon service we'll often recommend that a dedicated internet connection is installed, primarily so people's internet browsing activity doesn't affect your voice call quality. Of course, with many of us now working from home, we tend to have a dedicated connection anyway, and it's only when the kids get back from school that it becomes shared between your work and their Fortnite.

Small business owner on VoIP phone smiling
Improved voice quality is just one of the benefits of VoIP for small businesses

Disadvantages of VoIP

While for many businesses VoIP provides a plethora of significant benefits, there are of course disadvantages and it's important that we share those with you. Crucially, none of these issues are insurmountable and if you do suffer from any of the problems mentioned there is usually a simple way to solve it.

Reliable internet connection is required

To use VoIP you need a reliable internet connection. If your connection often drops out or is very slow, then you'll find that calls get cut off and the quality is poor too. It's therefore extremely important that before you embark on getting a VoIP phone system you solve any on-going issues with your internet connection. Usually, where people are working from an office location, we'd recommend installing a separate connection purely for calls so as to minimise any issues relating to people using the internet for other purposes.

Power outages

In order to make VoIP calls from your handset or desktop/laptop, you'll need power, and if it drops you won't be able to make and receive calls. Fortunately, with your mobile apps, you would still be able to make calls from your smartphone. That's the great thing about VoIP, if power is cut to your office or home there are still options.

What is the best VoIP service for small business?

Truth be told there's a lot of choice in the market when it comes to VoIP services and providers. The best VoIP service for your business will depend on your requirements but what we can say, as one of the best UK VoIP providers ourselves, is that you should look for a company that is well established and ideally has UK support.  It's also important to choose a provider that isn't too big as you don't want to become insignificant to them. T2K is a small business specialist and has been providing services to companies across the UK for over 28 years. With 100% UK based support, our team of VoIP telecoms experts provide a 5* rated service.

As a telecoms company, we work with a number of technology providers, from Mitel to Gamma, and have experience working with a huge variety of phone systems. Through our experience, we've selected what we think is the best cloud VoIP solution for our clients, which is Gamma Horizon.

Introducing Gamma Horizon

Gamma is an award-winning provider of Unified Communications as a Service (UCaaS), meaning among other things, they provide one the UK's leading hosted VoIP services. Gamma provides everything from internet connections and telephone numbers through to SIP trunks and hosted phone systems. They are an international company, operating in the UK, Holland, Germany and Spain and T2K selected them as their hosted VoIP partner due to their incredibly high service levels and the extensive features their platform offers.

Team in a small business meeting via conferencing
Get a business-class VoIP phone system

Useful features for small business

If you're a start-up or even a small business that's been operating for some time, then it's likely that while you're obviously familiar with phones, you may not be up to date on what the latest VoIP systems can do. If that's the case then this section is for you, where we'll explain many of the extensive features and how they can benefit your business.

Auto Attendant

You know the menu options you get when you ring a large company, "press 1 for sales or  2 for customer services"? That's an auto-attendant in action, routing your call to the correct destination. Yes, if it's configured poorly it can be annoying for customers who can find themselves stuck in loops or in the wrong place, but set up well, it's a time saver for both the caller and the recipient. Even if there's only a couple of people in your business, by routing the call to the correct destination you avoid the other person becoming your temporary secretary and ultimately save time. Not only that, it presents a professional image and can give the impression that you're bigger than you actually are. Auto-attendant is an enterprise-grade call management feature that you get as part of your cloud-based VoIP service.

Hunt Groups

Hunt groups are useful when your team becomes a little larger, but we usually wouldn't recommend using them unless you have more than 4 people using your VoIP Service. Hunt groups are another call routing feature that sends calls to several people rather than a single destination. So rather than one phone ringing, you can have a whole teams' phones ring and whoever picks up first takes the call. That's the simplest way to explain it, but with hunt groups, you can do more complicated ring patterns too, for instance, ringing phones in a set order. Again, this sort of functionality would usually be reserved for companies with expensive telephone systems, but with our VoIP phone system, businesses of all sizes can benefit.

Call Park

We find that the Call Park feature is one that many users really value-  it not only allows you to put a call on hold, but you can then pick it up on another phone or even your smartphone. This is perfect if you've been on a call for a while and you need to move away from your desk. Simply ask the customer if they mind going on hold, park the call and then pick it back up on your mobile and you're free to leave your desk. You can do exactly the same in the other direction too, so if you pick up a call on your mobile via the Horizon app,  and then you return to your desk, you can park the call and pick it up on your handset, freeing your mobile phone up again.

The VoIP phone system from T2k has saved us serious expenditure and has changed the way we work for the better.
Steve Knell -Altogether Care
on Google

Call Waiting & Music On Hold

Another small business favourite is Call Waiting - using it means you needn't ever miss a call again.  With Music On Hold you can choose between playing some music to the waiting person, or why not record bespoke promotional messages which they can hear while they wait? Best yet, you don't even need to be the one that answers the call -with the Call Pickup feature, other people in the team can answer each other's calls, whether their phone is ringing or if they're queued.

CLI Flexibility

CLI Flexibility sounds complicated but all it actually means is that you can make calls from various numbers - you don't always need to dial out on the same one. This can be really useful if you're running a regional marketing campaign and want to present a local image, or even if your company has several brands or sub-companies and you want to keep them separate. Again, big businesses use this all the time and will call out on the VoIP phone number they want you to see, so why shouldn't you have the ability too?

Call Recording

Call recording used to be an advanced feature that would require additional hardware and software. Fortunately today you can access it with a simple software license. Even small businesses can benefit from Call Recording and it's especially useful if you work in financial services from a compliance perspective.

Instant Group Call

Once you have your cloud-based business VoIP system, you and your colleagues can have both planned and ad-hoc group conference calls. You have the ability to invite people to your call at any time, which is particularly useful while we're all working remotely from each other.

One number anywhere

We mentioned this earlier, but a significant benefit of a business VoIP system is that you can have a single telephone number regardless of where you are. This feature makes it simple for customers to reach you and gives you the flexibility to work from anywhere without missing important calls. You no longer need to tell clients you're working from home - it doesn't matter - your calls will be routed directly to you wherever you are.

Other features

This is only a relatively small snapshot of what we think are the best features of our business phone system - there are lots more that we haven't mentioned that we can discuss with you if you feel they would be useful. These are:

  • Automatic callback
  • Busy lamp keys
  • Call forwarding
  • Call rejection
  • Click to dial
  • Company directory
  • Diversion inhibitor
  • Do not disturb
  • Last number redial
  • Sites, groups and departments

As you can see, the cloud-based hosted business phone system we provide - Gamma's Horizon - is comprehensive and almost everything you could ask of it.

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Frequently asked questions

How do I set up a VoIP phone system for small business?

The first step is to contact a VoIP provider like ourselves to discuss your requirements. We'll find out more about your business during the call and what you need your phone service to do. From there, we'll create a bespoke quote and share it with you. Assuming you're happy to proceed, we'll set up the service and issue you with your new VoIP phone numbers. We'll ship out your handsets and show you how to install your softphones, and finally, should you wish to keep your existing numbers, we'll arrange for them to be ported over to us.

What is the best VoIP phone service for small business?

The five best VoIP services for businesses in the UK are:

- Gamma Horizon
- 3CX
- Phonline+
- bOnline
- Lily Comms

How much does a VoIP system cost?

The cost of a VoIP system will vary depending on your specific requirements. If you opt only to use softphones and are happy to use new telephone numbers, the cost will be as low as £9 per user per month. If you want handsets, headsets and a range of phone numbers, the price will be higher.

How does VoIP work for small business?

VoIP works by transmitting telephone calls over the internet rather than traditional PSTN and ISDN networks. As the calls aren't tied to a phone line, you can make and receive calls from anywhere with an internet connection. Typically, small businesses opt for what's called a hosted PBX, as doing so brings a significant number of advantages compared to buying a physical phone system.

Is VoIP cheaper than a landline?

Yes, VoIP calls are typically much cheaper than calls made from a regular landline. In addition to reducing call costs, you don't need to buy a handset as you can use an app on your laptop or smartphone called a softphone.

What is a PBX system for small business?

Usually, a small business will get the most from a hosted PBX rather than an onsite system. It depends on the company though so please get in touch to speak to one of our small business experts about your requirements.

Download the Gamma Horizon PDF Brochure