A virtual office phone number gives your business a professional local or national phone presence without requiring a physical office, a landline installation, or a long contract. Calls to the number reach you on your mobile, laptop, or desk phone — wherever you happen to be.
This is increasingly how UK small businesses, freelancers, startups, and remote teams operate. This guide covers exactly how virtual numbers work, what they cost, and how to get one set up.
The short answer:
- A virtual phone number is a real UK phone number that routes calls over the internet rather than a physical line
- You can get a local 01/02 number (Southampton 023, London 020, etc.) or a national 03 number
- Calls reach you on any device — desk phone, mobile app, or laptop — from anywhere
- Setup takes under an hour; no physical installation required
- Costs start from £5.99/month with VoIPNinjas; no minimum contract
What a virtual office phone number actually is
A virtual phone number is a real UK telephone number that exists on a VoIP platform rather than a physical phone line. When someone calls it, the call routes over the internet to wherever you have configured it to go — your mobile, a desk phone, your laptop, or a combination of all three.
From the caller’s perspective, it works exactly like any other phone call. They dial a number, it rings, you answer. The fact that the call travelled over the internet rather than copper wire is invisible to them.
What makes it “virtual” is that there is no physical connection between the number and a fixed location. A London 020 virtual number does not require a London office. A Bournemouth 01202 number does not require premises in Bournemouth. The number is a label that routes calls to wherever you are.
Who needs a virtual office phone number?
Startups and new businesses
You need a professional phone presence before you have office space. A 01202 Bournemouth number or a 020 London number on your website and business cards establishes credibility immediately, without committing to a physical location.
Home-based businesses
Working from home does not mean customers need to know that. A virtual number keeps your personal mobile separate from your business calls and gives you a professional local number to publish.
Remote teams
Your team is distributed — some in Bournemouth, one in Bristol, one working from Jersey. A virtual number system connects them all as one operation. Calls to the main number ring all of them or route based on availability.
Businesses expanding into new areas
You serve clients across the South Coast but your office is in Christchurch. Adding a Southampton 023 number and a Portsmouth 023 number costs a few pounds per month and makes clients in those areas more likely to call.
Businesses establishing mainland presence from the Channel Islands
A Jersey or Guernsey business that wants a mainland UK number for mainland clients — without a mainland office — is an ideal use case.
Types of virtual number available in the UK
Local geographic numbers (01/02)
These are the standard local area code numbers. A 01202 number reads as Bournemouth/Christchurch. A 023 number reads as Southampton or Portsmouth. A 020 number reads as London. Callers see a local number and know roughly where you are based — which builds trust, particularly for local businesses.
National numbers (03)
03 numbers are non-geographic — they do not suggest a specific location. They are charged at the same rate as 01/02 numbers for callers (no premium, covered by inclusive minutes on mobile contracts). A 0300 number is used by charities, public bodies, and businesses that operate nationally and do not want to be associated with a specific region.
Freephone 0800
Freephone numbers are free for callers to dial. For customers, this removes any barrier from calling. For businesses, the call cost is absorbed by the receiving party. VoIPNinjas supports 0800 numbers — contact us to discuss adding one to your account.
What you can do with a virtual number
Routing to any device
Configure calls to ring your mobile app, your desk handset, your laptop, or all three simultaneously. Answer on whatever device you pick up first.
Time-of-day routing
During business hours: ring your team. Out of hours: play a professional message with your hours and a callback option, or divert to an emergency mobile.
Hunt groups
Calls ring the first available person on your team. If they do not answer within a set time, the call moves to the next person, and so on. No call goes unanswered during business hours unless no one is available.
Missed calls go to voicemail, and the recording arrives in your email inbox. You can listen and respond without logging into a portal.
All calls to and from your virtual number are recorded and accessible in your account dashboard. Useful for compliance, training, and dispute resolution.
Call analytics
See how many calls you are receiving, when the busy periods are, which numbers callers are using, and how quickly calls are being answered.
How to get a virtual number set up
1. Choose your number type — local 01/02, national 03, or freephone 0800
2. Sign up for a VoIPNinjas plan — from £5.99/month per user, 28-day rolling
3. Select your number — choose from available numbers in your preferred area code, or port your existing number
4. Download the app — iOS or Android, takes two minutes
5. Configure routing — set where calls go (mobile app, desk phone, or both)
6. Go live — your number is active and calls are routing, typically within the hour
There is no physical installation. No engineer visit. No waiting for Openreach to provision a line. The number is allocated digitally and live immediately.
What does a virtual phone number cost?
VoIPNinjas pricing for virtual numbers:
| Plan | Monthly per user | Included |
|---|---|---|
| Ronin | £5.99 | 100 UK minutes, 1 number, core features |
| Samurai | £14.99 | 750 UK minutes, number, all features |
| Shogun | £24.99 | Unlimited UK + 55 countries, number, all features |
Additional numbers can be added to your account for a small monthly fee. If you want a London 020 number and a Bournemouth 01202 number on the same account, that is straightforward to configure.
All plans on 28-day rolling agreements. No 24-month contracts.
Virtual number vs a traditional landline: the key differences
| Virtual number | Traditional landline | |
|---|---|---|
| Setup time | Under 1 hour | 2–3 weeks (Openreach installation) |
| Physical installation | None | Required |
| Works from anywhere | Yes | No (fixed to one location) |
| Contract | 28 days | 12–24 months typically |
| Price | From £5.99/month | £18–22/month line rental + call charges |
| PSTN switch-off risk | None — already VoIP | Must migrate by 2027 |
Frequently asked questions
Can I use a virtual number as my only business phone?
Yes. Many small businesses and sole traders use a single virtual number — configured to ring their mobile app — as their only business phone system. It is professional, cost-effective, and fully functional.
Can callers see my personal mobile number when I call out?
No. When you make outbound calls through the VoIPNinjas app, your virtual number is displayed to the recipient. Your personal mobile number stays private.
What happens if my internet goes down?
Configure your number to failover to a mobile number. If the app cannot connect, calls divert to your mobile automatically. No calls are missed.
Can I have multiple virtual numbers on one account?
Yes. A business can have several numbers — a main business number, a sales line, a support line — all routing to the same team or to different team members, depending on how you configure it.
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