Best modern business phone systems 2026: the honest list
If you're picking a business phone system this year, every list of the "best modern business phone systems" you'll find is written by someone selling one of them. This one is too. We build Olatti and I'd like you to try it. The difference is that I've spent eleven years selling the other ones, so I know where each of them hurts, and I won't pretend ours is right for every team.
The short version: if you already live in Microsoft 365, look at Teams Phone first. Replacing a landline cheaply, bOnline. A contact centre on the horizon, RingCentral or 8x8. IT support and a wish to run it yourself, 3CX. Living in Zoom, Zoom Phone. A small UK team that wants calling to keep up with how it already works, Olatti.
Prices are per user per month, UK rates where the vendor publishes them.
Why I can rank these honestly
I started circle.cloud, a UK telecoms company that installs and supports phone systems for small businesses, in 2015, and it still resells other people's platforms, PBXware among them, so I've sold most of the systems on this list for a living and I'm now building my own. Reselling teaches you two things fast: the platform wasn't designed for the scale you'll push it to, and anyone else can sell exactly the same thing. Those two frustrations are why we started building Olatti in 2021, and they're also why I'll tell you where our own product isn't the answer.
What does "modern" actually mean here?
Not "has an app". Nearly everything does now. Modern means your number isn't tied to a copper socket, people answer wherever they actually work, and no single handset is in charge. A modern IP desk phone can still be part of it if your team wants one.
Microsoft Teams Phone
What it is: calling bolted onto Microsoft Teams, for a business already on Microsoft 365.
Price: Microsoft publishes Teams Phone Standard at £7.70 per user per month, pay-as-you-go calling at £9.20, domestic calling at £13.10 and domestic plus international calling at £26.10, paid yearly and excluding VAT. A separate eligible Teams licence is required. Operator Connect, Teams Phone Mobile and Direct Routing are alternatives to a Microsoft Calling Plan.
Where it's strong: if the whole company already lives in Teams and Outlook, adding calling is the path of least resistance, and the meeting suite (large calls, webinars, breakout rooms, whiteboards) goes deeper than any calling-first tool will build. No new app to roll out.
Where it falls short: calling is an add-on to a meetings-and-chat product, not the reason it was built, and it shows. Recording isn't on by default and has to be configured per policy. Reaching someone means opening Teams, not a keystroke.
RingCentral
What it is: a long-established, enterprise-grade unified communications platform: calling, messaging, video, and a separate contact-centre product (RingCX) for anyone who needs one.
Price: RingCentral doesn't present a stable UK self-serve price I can responsibly quote here. Check the current RingEX plans and get the full per-user cost, add-ons included, in writing.
Where it's strong: breadth. Two decades of devices and integrations, established call handling and recording, video meetings, and a clear path into contact-centre products.
Where it falls short: recording modes, retention and conversation-intelligence features vary by plan and product, so compare the quote against the exact workflow you need, not the feature pages.
3CX
What it is: a self-hosted or 3CX-hosted PBX you configure rather than a fully managed SaaS product, popular with UK businesses and the IT firms that support them.
Price: per system rather than per user, which can beat per-seat pricing at low simultaneous-call volume. Check your actual concurrent-call needs before assuming it's cheaper.
Where it's strong: control. Self-hosting means the system is yours, and it supports voice alongside channels such as WhatsApp, Facebook and live chat. Recording is configurable per extension, for external calls or all calls, rather than forced on every user.
Where it falls short: you (or your IT provider) own the setup and upkeep, and you'll need to bring your own SIP trunk to get a working number. Transcription can use 3CX's cloud or a locally installed engine, with availability depending on your edition and configuration, so it's still something you set up deliberately.
Zoom Phone
What it is: the calling layer of Zoom, sold standalone or bundled into a wider Zoom Workplace plan.
Price: Zoom presents current Phone plans and bundles through its pricing flow, so check the quote for your region, calling allowance and wider Workplace bundle.
Where it's strong: call quality and reliability carry over from Zoom's meetings reputation, it works without a desk phone from day one, and live transcription is built into the desktop and mobile apps.
Where it falls short: it's a calling feature attached to a meetings company, so the day-to-day identity of the product is still "Zoom", not "your phone". Search across past calls is thinner than in a tool built around that idea from the start.
8x8
What it is: a long-running unified communications platform covering calling, meetings and contact-centre functions in one suite.
Price: 8x8 has moved to a quote-only model for UK business plans. No published self-serve rate, so you're talking to sales before you know the number.
Where it's strong: recording and transcription are included as standard rather than as paid add-ons, which is more generous than several tools on this list, and the platform scales into contact-centre territory if you outgrow simple calling.
Where it falls short: no public pricing means no comparison with anything else on this page until you've had a sales call, and a platform built to scale into a contact centre carries complexity a five-person team doesn't need.
bOnline
What it is: a budget-focused UK VoIP provider aimed squarely at small businesses replacing an old landline.
Price: bOnline currently publishes Starter from £7, Unlimited Calling from £13.95 and AI for Business Calls from £19.95 per user per month, excluding VAT.
Where it's strong: a two-minute self-serve setup and a UK small-business focus that shows in the pricing and the support. If the job is simply "replace the landline as cheaply as possible", it does that job well.
Where it falls short: Starter is intentionally basic. On-demand recording starts with Unlimited Calling, while recording, transcription, summaries and keyword search sit in the top AI for Business Calls plan. It's a calling product, not a wider team communications workspace.
Olatti
What it is: the one we build. A keyboard-enabled business communications platform: double-tap a global hotkey, type a name, press enter to call or shift-enter to message, from inside whatever you were already doing.
Price: not published while we're in the waitlist stage.
Where it's strong: speed and continuity. Calls can be recorded across the plans, with transcription, summaries and search on the plans that include them, on infrastructure we run in the UK rather than through a third-party transcription vendor. You can move a live call from your desk to your phone and keep talking. Calls, messages and channels live in the same app.
Where it falls short, honestly: we're pre-launch, so there's no years-long list of integrations to point to and no contact-centre product if that's what you need. If your business already runs entirely on Microsoft 365 with no appetite for another app, Teams Phone beats us on convenience alone. We're also not the cheapest option here, and we're not trying to be. Who it's for: a UK team of roughly five to one hundred people who spend the day inside a laptop, moving between customers, colleagues and tools, and want calling to keep up.
How do you choose the best modern business phone system?
Skip the feature checklist. When I was selling these, four questions settled most deals, and they still do:
- Are you already fully committed to Microsoft 365, with no appetite to add another app? If yes, Teams Phone's familiar admin environment will usually decide it.
- Do you need a contact centre, or just a team that can call and message each other well? RingCentral and 8x8 earn their complexity if you need the former. Most small teams don't.
- Do you want to own the system, or rent one that's just handled? 3CX if you (or your IT provider) want control and don't mind the setup. Everything else here is fully managed.
- Is the honest goal "cheapest working phone line" or "a tool the team actually enjoys using"? bOnline wins the first outright. The rest of this list, Olatti included, is competing on the second.
There's no universally correct answer, only the one that fits what you're actually optimising for.
Frequently asked questions
Which is cheapest for a five-person team? On the public UK prices checked for this article, bOnline has the lowest entry price at £7 per user per month excluding VAT. Compare the included minutes, recording and contract term before treating the lowest headline as the lowest total cost.
What happens to the old phone line if I don't switch to any of these? It stops working. The PSTN switch-off retires the UK's analogue and ISDN network by the end of January 2027, so every business on an old line has to move to calling over the internet whichever tool it picks. The full detail is in our guide to the 2027 PSTN switch-off.
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I said at the top that every one of these lists is written by someone selling a phone system. I still am. I'd just rather you picked the right one, even when it isn't mine. If the right one is calling fast enough that you stop thinking about it, join the Olatti waitlist and we'll bring you in early.