Do sole traders need a business phone number?

You're not legally required to have a separate business phone number as a sole trader, but it's strongly recommended. A dedicated number gives you professional credibility, lets you set business hours so customers aren't calling at 10pm, and keeps your personal number private. It also makes your bookkeeping cleaner and gives HMRC a clear separation between personal and business expenses.

Can I use my personal number for business as a sole trader?

You can, but it creates real problems over time. You lose any work-life boundary, your personal number ends up on Checkatrade, invoices, and van signage permanently, and you can't set business hours or hand calls to someone else when you're busy. A separate business number costs as little as £1.70/month and solves all of these issues without needing a second phone.

What is the cheapest business number for a sole trader?

The cheapest option is a virtual business number from a provider like Line, which starts at £1.70 for the first month and then £5/month. That includes a real UK mobile (07) number with SMS, voice calls, voicemail, and business hours — no contracts, no hardware, and no hidden fees. A second SIM card costs £5-15/month on a contract and doesn't include any business features.

Can HMRC see my personal phone records if I use it for business?

HMRC can request records related to your business during an investigation, and if your personal phone is your only business phone, that gets complicated. Separating personal and business calls with a dedicated number makes it straightforward to prove which costs are genuine business expenses. It also simplifies your self-assessment tax return.

Should I get a mobile or landline number as a sole trader?

For most sole traders, a mobile (07) number is the better choice. Customers trust mobile numbers, they can text you (which landlines can't receive), and they work regardless of where you are. Landline (01/02) numbers can be useful if you want local presence — for example, a Manchester plumber might want an 0161 number — but you lose SMS capability, which is a significant downside.

Business Numbers

Business Phone Number for Sole Traders UK: Do You Need One?

77% of UK sole traders use their personal number for business. Here's why that's costing you work — and how to get a proper business number from £1.70/mo.

Simon

8 April 2026 · 10 min read

TL;DR — What you need to know

77% of UK freelancers use their personal number for business — it works until it doesn't
A separate business number protects your personal life, looks more professional, and is a tax-deductible expense
For sole traders, a virtual mobile (07) number is the best option — customers can call and text, and you don't need a second phone
You can set one up in under 3 minutes from £1.70/month with no contracts

You became a sole trader to do work you're good at — not to answer calls at 10pm from a customer who found your personal number on a Checkatrade listing. But that's the reality for most one-person businesses in the UK.

A Moneypenny study found that 77% of UK freelancers and sole traders use their personal mobile number for business. It makes sense at first. You already have a phone. Why pay for another number?

But then the problems start. And by the time you realise, your personal number is printed on invoices, stuck on the side of a van, and saved in hundreds of customers' contacts. Getting it back is nearly impossible.

This guide explains why a separate business number matters for sole traders specifically, what type of number to get, and how to set one up without spending more than a few quid a month.

The personal number problem

Using your personal number for business feels free. It isn't. Here's what it actually costs you:

You can never switch off. There's no business hours setting on your personal number. A customer texts at 10pm asking for a quote, and you either reply (goodbye evening) or ignore it (goodbye customer). Neither option is great.

You look less professional. When a potential customer is choosing between two plumbers, the one with a dedicated business number on their card looks more established. It's not fair, but it's true. First impressions are made before you ever pick up the phone.

Your personal life leaks into work. A supplier calls while you're at your kid's school play. Your mum texts while you're on a call with a client. Everything is tangled together in one inbox, one call log, one voicemail.

You can't hand off calls. When you're on a job, up a ladder, or under a sink, calls go to your personal voicemail — which probably still says "Hi, this is Dave" rather than anything professional. If you ever hire someone to help, they can't answer your personal phone.

Your number is public forever. Once your personal number is on Google My Business, Yell, Checkatrade, Bark, or your Facebook page, it's out there permanently. Even if you get a business number later, your personal one will keep ringing for years.

Do sole traders actually need a business number?

There's no legal requirement for sole traders to have a separate business number. But that doesn't mean you don't need one.

Here's why it's worth it:

Professionalism that wins work

Customers judge you before you say a word. A dedicated business number — especially one with a professional voicemail greeting — signals that you're a proper business, not someone doing this on the side. For tradespeople quoting on competitive jobs, this can be the difference between getting the work and losing it.

Real work-life boundaries

With a separate business number, you can set business hours. Calls outside those hours go straight to a professional voicemail. You get your evenings back. You get your weekends back. This isn't a luxury — it's how you avoid burnout when you're a one-person operation.

Cleaner books and easier tax returns

When your business calls and texts are on a separate number, it's simple to account for the cost. There's no need to estimate what percentage of your personal phone bill is business use. Your business number bill is 100% a business expense — and HMRC prefers clean separation.

Future-proofing your business

If you ever want to sell your business, bring on a partner, or hire an employee, a dedicated business number transfers cleanly. Your personal number doesn't. Even if you're a one-person operation now, separating your business number early saves headaches later.

What type of number should a sole trader get?

Not all business numbers are the same. Here's what makes sense for sole traders:

07 mobile number — best for most sole traders

A mobile number starting with 07 is what most UK customers expect. They can call it, text it, and save it in their phone like any other contact. It feels familiar and trustworthy.

A virtual 07 number from a provider like Line works on your existing phone — no second SIM, no second handset. You get SMS, voice calls, and the ability to set business hours, all from one app.

Best for: Tradespeople, freelancers, personal trainers, mobile therapists — anyone whose customers expect to be able to text them.

01/02 local number — good for local presence

Geographic numbers like 0161 (Manchester), 0121 (Birmingham), or 020 (London) can give your business a local feel. If you're a plumber in Leeds, an 0113 number tells customers you're genuinely local.

The downside? 01/02 numbers can't receive SMS. In 2026, that's a real limitation — many customers prefer texting, especially for initial enquiries and quote requests.

Best for: Businesses where local trust matters more than text messaging — solicitors, accountants, established trade businesses with a physical premises.

03 non-geographic number — the professional option

03 numbers are national-rate numbers that don't tie you to a specific location. They look professional and cost the caller the same as a normal landline call.

Like 01/02 numbers, they can't receive SMS. They're also less familiar to consumers, which can be a drawback for sole traders working directly with the public.

Best for: Consultants and service businesses that want a national presence without a geographic tie. Less suitable for tradespeople and customer-facing sole traders.

Our recommendation for sole traders

Go with a virtual 07 mobile number. It's the most versatile option — your customers can call and text, you can manage it from your existing phone, and you can set business hours so you're not on-call 24/7. It's also the cheapest to set up.

The sole trader's checklist for choosing a provider

You're watching every penny — that's sensible. But the cheapest option isn't always the best value. Here's what to look for:

Low, predictable cost — avoid providers with per-minute or per-message charges that stack up. Look for inclusive credit bundles so you know what you're paying each month. Line starts at £1.70/month with transparent pricing.
SMS support — many VoIP providers only offer voice calls. If a customer can't text your business number, you're missing enquiries. Make sure your number supports both SMS and calls.
No contracts — as a sole trader, you need flexibility. Monthly rolling billing means you can cancel if things change. Avoid 12-24 month lock-ins.
Works on your existing phone — you shouldn't need to buy a second phone or carry two devices. A good virtual number app runs alongside your personal number on the phone you already have.
Business hours — this is non-negotiable for sole traders. You need to be able to switch off at 6pm and have calls go to voicemail automatically. Without it, you're back to square one.
Shared inbox — even if you're working alone now, having a shared inbox means you can add someone later without changing your number or setup.

Setting up a business number with Line

Sign up in 60 seconds

Head to useline.io/signup and create your account with just an email. No credit card required upfront — you can look around the dashboard before committing to a number.

Choose your number

Pick a real UK mobile (07) number from the available pool. Your number is live immediately — no waiting for a SIM in the post, no porting paperwork, no activation delays.

Set your business hours

Define when you're available to take calls. Outside those hours, calls go straight to a professional voicemail. No more 10pm texts about a leaking tap.

Download the app

Install the Line app on your phone. You can now make and receive calls, send texts, and manage your inbox from the same phone you already carry. Your personal number stays completely separate.

Add your number everywhere

Put your new business number on your business cards, Checkatrade profile, Google My Business listing, invoices, and van signage. Your personal number stays private.

The whole setup takes under 3 minutes. No hardware, no engineer visits, no contracts.

Industry-specific tips

Tradespeople (plumbers, electricians, builders)

Your customers often text photos of problems — a leaking pipe, a broken socket, a cracked wall. With a business number that supports SMS, you can receive these images, send quick quotes, and confirm job times all from one thread. It also makes it easy to text a customer when you're running 20 minutes late, which goes a long way for your reputation.

Keep your personal number off Checkatrade, MyBuilder, and Bark. Once it's on those platforms, it's public. Use your business number from day one.

Freelancers (designers, writers, consultants)

A professional voicemail greeting on a dedicated number makes a better impression than "the person you're calling is not available" on your personal mobile. For client calls, having a separate number also means you can mute work notifications during personal time without missing anything — just check the app when you're ready.

If you work with international clients, a UK business number also gives you a consistent point of contact regardless of where you're actually working from.

Delivery drivers and couriers

SMS confirmations are essential in delivery work. A business number lets you text customers about arrival times, access instructions, and delivery confirmations without giving out your personal number to dozens of strangers every week. When the job is done, there's no reason for a customer to have your personal contact details.

Personal trainers and therapists

Appointment confirmations and reminders over SMS reduce no-shows significantly. A business number keeps your client communications organised and separate from personal texts. It also means clients can't reach you outside your working hours — important for maintaining professional boundaries in roles where the relationship can feel informal.

Get your sole trader business number

Real UK mobile number with SMS, calls, and business hours. From £1.70/month, no contracts.

Get a Number

Tax tip for sole traders

Your business phone number is a legitimate, fully deductible business expense. If you're a sole trader, the full monthly cost of a dedicated business number (like Line at £5/month) goes on your self-assessment as a business cost. That's straightforward to claim because it's 100% for business use — unlike your personal phone bill, where HMRC expects you to estimate the business percentage. Keep the receipts and save yourself the hassle at tax time.

Next steps

Getting a dedicated business number is one of the simplest things you can do to make your sole trader business look and feel more professional. It takes minutes, costs less than a coffee, and gives you something genuinely valuable: the ability to switch off at the end of the day.

If you're ready, sign up for Line and pick your number. First month is £1.70, there are no contracts, and you can cancel anytime. Your personal number deserves to stay personal.

For more on choosing the right number, see our guides on getting a UK business mobile number, second phone number options, and free business number alternatives.