Business VoIP Providers UK | Compare Top Providers 2026

Compare The Networks is a UK-based comparison service helping UK businesses compare telecoms options. We compare business VoIP providers so you can move to a hosted phone system without wading through a dozen sales pitches.

Compare The Networks is UK-based, and current customer feedback is available on Trustpilot. You can request a free, no-obligation quote.

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About Business VoIP Providers

A business VoIP provider delivers your phone service over your internet connection instead of the old copper phone line. Calls, voicemail, call routing and features such as auto-attendant all run in the cloud, so your team can answer the business number from a desk phone, a laptop or a mobile app.

The UK VoIP market includes national providers, regional specialists and resellers of common underlying platforms. We compare the available options side by side on requirements such as pricing, features and support.

With the PSTN and ISDN switch-off scheduled for the end of January 2027, every UK business still on a traditional line will need to move to a VoIP or all-IP service. Comparing providers now, while you have time, almost always beats being migrated on your provider's terms at the last minute.

What to Look For in a VoIP Provider

Not all VoIP providers are equal. These are the areas we weigh up when we compare them for you:

Uptime and SLA. Your phones are business critical. Look for a published uptime guarantee (99.9 percent or better) and a service level agreement that spells out response times, not vague promises.
Call quality. Hosted voice is only as good as the network behind it. Providers with UK-based, well-provisioned platforms and quality-of-service prioritisation deliver clearer, more reliable calls.
Number porting. You should be able to keep your existing landline numbers. Check that porting is included, how long it takes, and whether there is a charge.
Integrations. The best value comes when your phone system talks to the tools you already use, such as Microsoft Teams, your CRM, or a helpdesk. Screen-pops and click-to-dial save real time.
UK support. When a call fails you want a person, not a ticket queue. UK-based support that knows your account is worth paying a little more for.
Contract length and price rises. Read the small print on term length, mid-contract price increases (often CPI plus a few percent), and exit fees. A cheap headline price can cost more over a full term.

How It Works

Tell us what your business needs: how many users, whether you want desk phones or softphones, and any must-have features or integrations.
We compare hosted phone systems from leading UK VoIP providers on price, features, support and contract terms.
You choose the option you prefer, then confirm number-porting, setup and support arrangements with the selected provider.

You can request a free, no-obligation quote. Compare The Networks is UK-based and helps businesses compare telecoms options.

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Why Compare Providers?

Most businesses that have not reviewed their phone system in a few years are on legacy pricing, paying line rental they no longer need, or locked into features that never got used. Because providers rarely volunteer a better deal, the only way to know whether you are getting value is to put them side by side.

What We Check	Why It Matters
Price per user, per month	Headline rates hide add-on costs; the true per-user figure is what counts
Uptime and SLA	Guaranteed availability keeps your phones running when it matters
Number porting	Keeping your existing numbers avoids disruption and reprinting stationery
Integrations	Teams, CRM and helpdesk links turn a phone system into a productivity tool
Support quality	UK-based support that knows your account resolves issues faster
Contract terms	Length, in-contract price rises and exit fees decide the real total cost

Frequently Asked Questions

What does a VoIP provider do?

A VoIP provider runs your business phone service over the internet rather than a traditional phone line. They host the phone system in the cloud, supply your business numbers, route incoming and outgoing calls, and provide features such as voicemail-to-email, auto-attendant, call recording and mobile apps. Because everything is hosted, there is no on-site phone hardware to maintain and you can scale users up or down as your team changes.

How much does business VoIP cost per user?

Most UK business VoIP plans fall between roughly 8 and 20 pounds per user per month, depending on the features, call bundles and level of support included. Entry-level plans cover calls, voicemail and an app, while higher tiers add call recording, analytics, CRM integration and video conferencing. The best way to get an accurate figure for your setup is a free, tailored quote, as pricing depends on user numbers and the features you actually need.

Can I keep my number when switching VoIP provider?

Yes. UK number portability means you can port your existing landline numbers to a new VoIP provider and keep them. Porting is usually included and typically completes within a couple of weeks, though simple single-number ports can be faster. Your numbers keep working throughout, so there is no downtime and no need to reprint stationery or update your website.

Do I need special hardware for business VoIP?

No special hardware is required. VoIP works over your existing internet connection, and you can make and take calls using a softphone app on a laptop or mobile. If you prefer physical handsets, you can use IP desk phones, which simply plug into your network. Most businesses use a mix of desk phones and apps. A reliable broadband connection matters more than any particular hardware.

What is the best VoIP provider for a small business?

There is no single best provider for everyone. The right choice depends on your user numbers, budget, the integrations you rely on, and how much support you want. A very small team might prioritise simple per-user pricing and easy setup, while a growing business might value CRM integration and account-management options. Compare the quoted terms against your requirements before choosing a provider.

What happens with the PSTN and ISDN switch-off in 2027?

The UK's traditional analogue phone network (PSTN) and ISDN lines are being switched off, with the migration due to complete by the end of January 2027. After that, all voice services must run over IP, meaning any business still on a legacy line must move to VoIP or an all-IP alternative. Switching to a VoIP provider now puts you ahead of the deadline, avoids a last-minute forced migration, and usually reduces your monthly costs at the same time.

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