Objective: Help UK small business owners understand what a cloud phone system actually does, what separates a good one from an overpriced one, and how to pick the right fit before the PSTN switch-off forces the decision for them.
Key Takeaways
- A cloud phone system UK businesses can rely on runs entirely over your internet connection, no phone lines, no on-site box, no engineer visits for every small change.
- The UK’s old copper phone network is being switched off on 31 January 2027. Any business still on ISDN or analogue lines needs to move before then.
- Prices for a hosted phone system typically run from around £8 to £15 per user, per month, with call recording, auto-attendant and mobile apps included as standard.
- The real differentiator between providers isn’t the feature list, it’s UK-based support and whether you get a named account manager or a ticket number.
- Comparing quotes from multiple providers, rather than going direct to one, is usually what saves the most money.
In this article:
- What Is a Cloud Phone System?
- How Does a Cloud Based Phone System Actually Work?
- Why Is Everyone Switching Now?
- What Should You Look For in a Cloud Phone System for Small Business?
- Cloud VoIP vs Traditional Landlines
- How Much Does It Cost?
- FAQs
Your receptionist just left for the day. It’s 5:15pm and a potential customer is calling the office line, listening to it ring out, and hanging up before voicemail even picks up.
That call doesn’t come back. Most callers who hit an unanswered line or a voicemail just try the next business on the list instead.
That’s the entire case for switching, in one sentence. A properly set up cloud phone system UK businesses use doesn’t lose that call, it forwards it to a mobile, a second person, or an out-of-hours message that actually gets checked. And with the UK’s copper phone network being retired in under a year, most businesses won’t have a choice about making the switch anyway.
What Is a Cloud Phone System?
A cloud phone system is a business telephone service that runs over the internet instead of copper phone lines. No PBX box on the wall, no engineer needed to add an extension, no physical wiring between desks.
You get one number (or several) that can ring on desk phones, mobiles, laptops or an app, depending on how you set it up. Everything, call routing, voicemail, recording, lives in the provider’s data centre, not in your office cupboard.
This is also called cloud VoIP, hosted telephony, or a cloud hosted phone system. The terms get used interchangeably, and they all describe the same underlying technology: Voice over Internet Protocol, or VoIP.
How Does a Cloud Based Phone System Actually Work?
Your voice gets converted into data packets and sent over your broadband connection, the same way a video call works. The provider’s cloud platform handles the routing, deciding which extension, mobile or voicemail box the call lands on.
In practice, that means:
- A call to your main number can ring three people at once, or in sequence, until someone picks up
- Staff working from home answer the office number on a laptop or app, and the customer has no idea they’re not in the building
- Adding a new starter takes minutes through an online portal, not a callout from an engineer
The only real requirement is a stable internet connection with enough upload bandwidth for the number of calls happening at once.
Why Is Everyone Switching Now?
Two things are pushing this, and only one of them is optional.
The PSTN switch-off. Openreach has confirmed the UK’s traditional analogue and ISDN phone network shuts down permanently on 31 January 2027. If your business still runs on old copper lines, calls will simply stop working after that date unless you’ve moved to a cloud based phone system UK providers now offer as standard.
Remote and hybrid working. A desk phone tied to one building doesn’t fit how most small teams work now. A cloud system follows the person, not the desk.
There’s a third reason that gets less attention: cost. Maintaining an ageing on-site PBX, repairs, engineer visits, line rental, usually costs more over three years than a modern cloud phone systems subscription, even before you factor in the features you’re missing out on.
What Should You Look For in a Cloud Phone System for Small Business?
Not every provider is built for a five-person office, and paying for enterprise features you’ll never use is a common mistake. Focus on:
- Call handling basics, auto-attendant, call queues, and voicemail-to-email or transcription
- A mobile app that actually works, test it before signing, not after
- CRM integration, if your team logs calls against customer records
- UK-based support, a support desk in your own time zone matters more than people expect when something breaks at 9am on a Monday
- Simple scaling, adding or removing a user shouldn’t need a contract renegotiation
- Transparent pricing, no hidden setup fees or minimum contract surprises
A small business cloud phone system doesn’t need to be the most feature-heavy option on the market. It needs to be reliable, easy for non-technical staff to use, and backed by someone who answers the phone when you call them.
Cloud VoIP vs Traditional Landlines
| Cloud Phone System | Traditional Landline (PSTN) | |
| Setup | Software-based, live in days | Physical lines, can take weeks |
| Working from anywhere | Yes, via app or laptop | No, tied to the building |
| Adding users | Minutes, via online portal | Engineer callout usually needed |
| Ongoing cost | Predictable monthly fee | Line rental + call charges + hardware upkeep |
| Future support | Actively developed | Being switched off January 2027 |
How Much Does It Cost?
Expect to pay somewhere between £8 and £15 per user, per month, for a solid small business package with call recording, auto-attendant and a mobile app included. Larger platforms with advanced contact centre tools or unlimited international calling run higher, often £20-£30+ per user.
The number that actually matters, though, isn’t the headline price. It’s what’s included at that price versus what gets added as a paid extra later. Two providers quoting £12/user can end up very different once you add CRM integration, extra call recording storage, or additional numbers.
This is exactly where comparing quotes from more than one provider pays off, the market price for the same feature set can vary considerably, and most businesses have no easy way to see that without asking around directly.
If you’d rather skip the research and get quotes lined up for you, you can compare VoIP solutions from the UK’s major providers in one go and see what’s actually available at your size and budget.
Don’t wait until January 2027 to sort this out. Migrations take longer when everyone’s trying to do them at once, and providers get booked up as the deadline approaches. If your current setup is still running on old lines, now’s a sensible time to get quotes and see what a modern system would actually cost you. Get a free quote and compare pricing before the rush.
Frequently Asked Questions
Q1. Do I need new hardware to switch to a cloud phone system?
Not necessarily. Many providers let you keep using your existing desk phones if they’re VoIP-compatible, or you can go phone-free and use the mobile and desktop apps instead. Most small teams end up using a mix of both.
Q2. Will my phone number stay the same if I switch providers?
Yes, in almost all cases. Number porting is a standard part of switching in the UK, and a good provider handles the whole process so there’s no gap in service.
Q3. Is a cloud phone system reliable if my internet goes down?
It depends on the setup. Most providers offer call forwarding to a mobile as a backup, and some offer a secondary internet connection for critical lines. It’s worth asking any provider directly how they handle outages before signing.
Q4. How long does it take to set up a cloud phone system?
For a small business, most providers can have you live within a few days to two weeks, depending on number porting and how many users you’re adding.
Q5. Is a hosted phone system actually cheaper than a landline in the long run?
Usually, yes. You avoid line rental, hardware maintenance, and engineer callout fees, and most businesses report meaningful savings within the first year, though the exact figure depends on your current setup and call volume.
Conclusion
The PSTN switch-off isn’t a “someday” problem anymore. It’s a fixed date, and the businesses that leave it until late 2026 are the ones who’ll be queuing behind everyone else trying to migrate at the same time.
Getting ahead of it doesn’t have to mean a big project. It usually means one comparison call and a decision. Speak to Arc Communications and get a straight answer on what a cloud phone system would actually cost your business, no obligation, no pressure.