You do not legally need a business phone number in the UK, but if customers ring you, a separate number for the business usually pays for itself: it keeps your personal number private, it gives customers a number that looks established, and it lets you switch work off in the evenings. This guide walks through when you actually need one, what the options cost, and how to get a business phone number without buying a second phone.
If you've just started a business, the phone question sneaks up on you. The website form asks for a contact number. The van needs a number on the side. Google Business Profile wants one. And the only number you have is the personal mobile you've had since university. What you do next is worth five minutes of thought, because it's much harder to change later.
Do You Legally Need a Separate Business Phone Number?
No. Nothing in UK law requires a business, whether you're a sole trader or a limited company, to have its own phone number. When you set up a business with GOV.UK, no one asks for one. You can legally run everything from your personal mobile forever.
So this is not a compliance question. It's a practical one, and the practical answer depends on one thing: do customers call you? If the phone is how work arrives, the case for a separate number gets strong quickly.
What Happens When You Run a Business on Your Personal Number?
Three things, and they all get worse over time.
Your personal number spreads and never comes back. Once it's on the van, the website, invoices and Google, it's public property. Every future customer, supplier and cold caller has the number your family uses. And you can never change it without repainting the van.
Work never switches off. When business calls and personal calls arrive on the same line, there is no such thing as an evening. You either answer everything or feel guilty about everything you didn't.
Callbacks from a personal mobile get ignored. When you miss a call and ring back from an unrecognised mobile number, most people don't pick up. We looked at this in detail in our piece on landline vs mobile for a trade business: depending on the source, between 60% and 77% of calls from unknown mobile numbers go unanswered. A recognisable business number fixes the loop.
What Types of Business Phone Number Can You Get in the UK?
Five, broadly, and they say different things about your business:
- A local landline number (01 or 02): the classic. A 020 or 0161 number says established and local, which is why it's still the strongest choice for most small businesses.
- A mobile number (07): free with any SIM, but it looks like what it is, one person and their phone, and it inherits every personal-number problem above if it's your own.
- A freephone number (0800): free for callers, paid for by you, and mostly a big-company signal. Rarely worth it for a one-person business.
- A national number (03): provider-neutral and professional, but anonymous. It tells customers nothing about where you are.
- A virtual landline: a real local landline number that rings on the mobile you already have. No socket, no desk phone, no second SIM.
One more thing worth knowing: UK numbers are portable. Ofcom's rules mean you can keep a landline number when the network changes and move it between providers, so a number you pick today isn't a decision you're stuck with.
How Do You Get a Business Phone Number Without Getting a New Phone?
This is the question most founders are really asking, because the old answer, a second handset or a dual-SIM setup, means carrying and charging two of everything. The current answer is a virtual landline: a real UK landline number that exists digitally and rings on the phone you already have.
Setup takes minutes, not engineer visits. You pick a local number (or port one you already have), calls to it ring your existing mobile with the business call announced so you know it's work, and if you can't answer, smart answering picks up and texts you what the caller wanted. Your personal number stays personal. Nothing new to buy or carry.
How Much Does a Business Phone Number Cost in the UK?
Anywhere from 99p to £25+ a month, and the spread is about what comes with the number. At the bottom end you get the number and nothing else: calls to it need forwarding you pay for, and there's no answering, no messaging, no support. At the top end sit full office phone systems built for teams with desks.
Solofone sits in the middle at £10/month with a free 7-day trial and no contract: the landline number, calls ringing on your existing phone, WhatsApp Business on the same number, and smart answering for the calls you miss. The honest advice either way: check what a cheap number doesn't include before comparing prices.
Can Customers WhatsApp a Business Phone Number?
Yes, if it's set up for it, and this matters more than most founders expect: for many small businesses, WhatsApp enquiries now rival phone calls. A WhatsApp Business landline number means the one number on your website handles both: customers ring it or message it, and your personal WhatsApp stays untouched.
How Quickly Can You Get a Business Phone Number?
Minutes, if you go virtual. A traditional landline installation can take days and may need an engineer visit; a new SIM means a trip to a shop or a wait for the post. A virtual landline number is live the same day you sign up: choose the number, connect it to the mobile you already have, and it's ready to go on the website, the invoices and the van.
That speed matters for one practical reason: the best time to sort the business number is before you print, publish or paint anything. If you're registering the business this week, the number is a same-day job you can tick off in a lunch break.
So, Should You Get One?
Use two questions. Do customers ring you? And have you ever hesitated before writing your personal number somewhere public? If the answer to both is yes, get the separate number now, while it's a five-minute job, rather than after your personal mobile is painted on the van.
It's the same advice whether you're a small business of one or planning to grow, and whether you're trading in London or anywhere else in the UK: separate the numbers before the wrong one spreads.
Ready to keep your personal number personal? See how Solofone works.