Looking for quality, cost-effective VoIP phone systems in the UK?

Get an award-winning, easy-to-use VoIP phone system for your UK business with friendly, 24/7 support from local experts.

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Our industry-leading VoIP solutions

For larger teams

Customisable VoIP phone systems for growing businesses.

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For growing teams

Gradwell’s own feature-rich, intuitive and powerful VoIP phone system.

Teams Direct Routing

Use Microsoft Teams as your business phone system, saving time and money.

For larger teams

We are the UK’s largest Titanium 3CX VoIP solutions provider.

From onboarding and setup to support and maintenance, we help businesses get more out of the 3CX cloud phone system. For the ultimate VoIP service experience, we supply with everything you need including hosting, integrations, support and hardware.

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Affordable simultaneous call licenses

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Flexibility across devices

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Disaster-proof infrastructure

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For growing teams

The best VoIP phone system for a small business in the UK.

Affordable, feature-rich and easy to use, Wave is our purpose-built VoIP phone system for UK businesses. With multi-device access, you can manage remote teams and make configuration changes from anywhere, in an instant. Plans start from £7.50 per month.

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Simple to manage

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Flexible call plans

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PC Pro Magazine-recommended

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Get more out of Microsoft Teams

All-in-one business communications with Direct Routing.

Turn Microsoft Teams into your business phone system and enjoy seamless communications with your colleagues and customers. Leveraging our own network and VoIP phone system, we can deliver a cost-effective and disaster-proof solution.

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Significant cost savings

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Port your numbers

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Expert support

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Streamline your business with the UK’s top VoIP provider

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“3CX offered the modern VoIP solution that we were looking for and Gradwell could provide the cost-effective option of scaling the system based on SIP lines rather than physical handset.”

Erin Teucher,

Deputy Head of IT

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“We are so lucky that we found you guys and it has transformed our service and has absolutely made the service what it is today. It has transformed care for countless numbers of people in Northeast London.”

Richard Muswell,

Service Digital Lead

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“Gradwell were by far and away the best value for money quote that we received, the Gradwell pricing structure is just phenomenal – such a massive difference from some other providers, and together with their exceptional service levels, it really was a no-brainer.”

Chris Goodchild,

General Manager

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Everything you need from a supplier you can trust


We supply all of the components to enable a VoIP phone system, from hardware to SIP trunks based on our own infrastructure.


Our portfolio of reliable, scalable and specialist broadband products ensures the perfect solution for every business’s needs.


Choose compatible hardware at preferential prices from a range of leading suppliers.


Our experts answer your most common questions about our UK VoIP phone systems and services.

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Can I transfer my existing business number to Gradwell?

As long as we have a porting agreement in place with your current provider, we will be able to move your business numbers over. Our experienced team will complete the necessary porting documentation and manage the order through to completion.

What’s the difference between a VoIP phone system and my current on-site PBX?

3CX and Wave are primarily deployed as a cloud-managed service in a data centre, rather than as a physical on-site PBX. This removes the risk of any expensive repairs, offers a range of extra features and there’s no need for any maintenance contracts.

Can I get 3CX and Wave on my mobile phone?

Absolutely. Both 3CX and Wave offer you access to a ‘soft phone,’ which is an app installed on your mobile phone. This will allow you to access all the features from your office phone and make calls from your office number.

Can Wave and 3CX support multiple sites?

Provided each of your sites has an internet connection (and we can help you get one if not), you will be able to utilise our cloud phone systems across your business premises.

How does direct routing work?

We host a Microsoft Teams-certified Session Border Controller (SBC) within our own network, which we then connect to our SIP Trunks. We then add another trunk between the SBC and Microsoft Teams so we can configure the line and connect this up with your Teams accounts.

Why Gradwell?

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Expert support

Receive as much or as little help as you need from our dedicated UK support team – 24/7/365 – and only pay for what you need.

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Born in the cloud

We’ve always engineered our solutions in the cloud, benefitting from decades of experience plus learning and responding to the market.

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Secure & compliant

Enjoy total peace of mind thanks to our ISO 27001:2013 certification, Microsoft Gold Partner and 3CX Titanium Partner statuses.