Priya runs a small bookkeeping practice from her flat in Manchester. When she launched her website last year she put her personal mobile number on the contact page, because it felt simple and honest. Within a month she was getting calls from new clients at ten at night, texts from suppliers on Sunday morning, and a cold call from a sales team while she was out with her family. Her phone had stopped being hers. That is the moment most small business owners start looking for a better way, and learning how to use a second phone number for business UK owners can set up in an afternoon is the answer.
A second number gives you a public business line and keeps your personal number private. Customers reach you easily, you can switch work off at the end of the day, and your business looks more professional from the first call. This guide explains the three main ways to get a second number in the UK, how much each one costs, how to set it up step by step, and how to run WhatsApp Business on it so clients can message you without ever seeing your personal number.
Why a Second Business Number Is Worth Having
When your personal number is also your business number, there is no boundary between work and the rest of your life. Every ring could be a client or a friend, and you cannot ignore a call without wondering if it was a sale. A second number fixes that. You know instantly which calls are business because they arrive on the business line, and you can silence that line after hours without missing anything personal.
There is also a privacy reason that matters more than most owners expect. If you sell on eBay, Vinted, Etsy or Facebook Marketplace, or if you are a sole trader who must show contact details to customers, your number can end up visible to strangers. A business number keeps your personal number off public listings and out of databases that get scraped and resold. If the business number ever starts attracting spam, you can change it without telling your friends and family to update their contacts.
Finally, a second number makes a one person business look like a proper business. A local 0161 or 020 number, or a clean 07 mobile number used only for work, signals to customers that you are organised and reachable. It also helps with verification. Marketplaces, banks and payment providers often ask for a business contact number, and having a separate line makes those checks far smoother.
How to Use a Second Phone Number for Business UK: The Three Main Options
There are three practical ways to run a second number in the UK, and the right choice depends on your phone, your budget and how you want customers to reach you. None of them needs a second handset, and all of them can be live within an hour.
Option 1: A second SIM in a dual SIM phone
Most modern phones have two SIM slots or one physical SIM plus space for a digital SIM. With a second pay as you go SIM from a UK network, you get a real 07 mobile number that works exactly like your main line. Calls and texts arrive on the same phone, and you choose which line to use each time you dial out. This is the cheapest route for many owners, because a pay as you go SIM can cost as little as £5 for the SIM itself, with credit that lasts for months if you only use it for incoming calls.
The main advantage is that the number is a genuine mobile number on a UK network, so it passes verification checks for marketplaces, WhatsApp Business and banking apps without trouble. The drawback is that you need a phone that supports two lines, and you have to manage two sets of call settings. If your phone is older, check the settings menu for a SIM manager before you buy anything.
Option 2: An eSIM as your second line
An eSIM is a digital SIM that you download to your phone instead of inserting a plastic card. Several UK providers now sell a second mobile number as an eSIM for around £5 to £6 a month, and the number is a real 07 number on a UK mobile network. You install it by scanning a QR code, label the line Business in your settings, and both numbers stay active at the same time.
This is the neatest option for iPhone and recent Samsung and Pixel owners, because there is nothing physical to lose and you can switch the business line off with one tap when you go on holiday. The number works for calls, texts and WhatsApp Business verification. The one thing to check is that your phone supports eSIM, which most phones sold in the UK since 2020 do. If your phone is locked to one network, you may need to ask that network to unlock it first.
Option 3: A virtual business number
A virtual number is a UK landline or mobile number that lives in the cloud and forwards calls to the phone you already own. Providers such as CallCenturion and Wavetel sell numbers with local area codes, so a business in Birmingham can show an 0121 number and a London business can show an 020 number, even if the owner answers on a mobile in another city. Setup takes about ten minutes, there is no SIM involved, and you get features such as business hours, voicemail to email and spam filtering.
Virtual numbers usually cost around £5 to £15 a month depending on the features you choose. They are the best choice if you want a landline style number, if several people need to answer the same business line, or if you want calls to stop outside your working hours. The catch is that some virtual numbers use internet calling ranges that marketplaces and banks may reject for verification, so if you need the number mainly to verify accounts, a real mobile number from a SIM or eSIM is safer.
How to Set Up Your Second Business Number Step by Step
Whatever option you choose, the setup follows the same pattern. Work through these steps in order and your business line will be running properly by the end of the day.
- Choose the type of number first. Pick a real mobile number if you need verification for marketplaces or banking. Pick a virtual number if you want a local area code and business hours.
- Check your phone. Look in Settings for SIM manager on Android or Mobile Data on iPhone to confirm dual SIM or eSIM support before you spend any money.
- Order the number. For a SIM, buy a pay as you go SIM from a UK network or an eSIM plan from a UK provider. For a virtual number, sign up with a UK provider and choose your area code.
- Activate and test it. Make a test call to the new number from another phone, send a test text, and check that the call shows the right line name on your screen.
- Label the line clearly. Name it Business in your phone settings and give it a different ringtone so you always know when a call is work.
- Set your defaults. Make your personal line the default for calls and texts, and choose the business line manually when you call a client, so you never ring a customer from your private number by accident.
- Update your listings. Put the business number on your website, your Google Business Profile, your invoices and your marketplace profiles, and remove your personal number from anywhere it is public.
- Tell your regulars. Send a short message to existing clients with the new number so they save it and keep using it.
Run WhatsApp Business on Your Second Number
WhatsApp Business is where a second number really pays off, because most UK customers would rather message a business than call it. Install the WhatsApp Business app alongside your personal WhatsApp, register it with your second number, and verify with the code that arrives by text or voice call. Your business profile can then show your opening hours, your address and a short description of what you do.
Set up a greeting message that replies instantly when someone messages outside your hours, and an away message that tells people when you will reply. Use labels to sort chats into new enquiries, active jobs and completed work, and use the catalogue feature if you sell products, so customers can browse without leaving the chat. If you already use WhatsApp to keep clients updated, you can also learn how to schedule a WhatsApp message on Android so reminders go out on time even when you are busy.
One warning matters here. WhatsApp actively blocks many internet based virtual numbers, because they are often used by spammers. If your main goal is a WhatsApp Business account, register it on a real mobile number from a SIM or eSIM, not on a virtual number. Landline numbers can sometimes be registered by voice call verification, but the process is less reliable and worth testing before you print the number on anything.
What a Second Business Number Costs in the UK
Costs are low, and for most small businesses the whole setup stays under £10 a month. Here is what to expect from each route.
- A pay as you go second SIM: £5 or less for the SIM, then only what you spend on calls and texts. Incoming calls are free, so many owners spend almost nothing after the first top up.
- A second number eSIM plan: around £5 to £6 a month for a real 07 number on a UK network, often with a small bundle of minutes and texts included.
- A virtual business number: around £5 to £15 a month depending on the provider and the features, with business hours, voicemail and call forwarding usually included.
- A landline number as an eSIM: around £10 a month plus VAT, useful if you want an 01, 02 or 03 number that rings on your mobile.
Before you commit to a monthly plan, check whether the price includes VAT, whether there is a minimum term, and whether you can cancel at any time. Rolling monthly plans are best while you are testing which option suits you, because you can switch without penalty. Also check what happens to your number if you stop paying. With a pay as you go SIM, the number can be lost if you do not use it for several months, so make at least one chargeable call or text every few months to keep it active.
Keep Business and Personal Calls Separate Every Day
Having a second number is only half the job. The other half is the daily habit of using it properly, so work stays in its place and customers always get a professional experience.
Set business hours and stick to them. Most virtual number providers let you define the hours when calls ring through, with out of hours calls going to voicemail. On a SIM or eSIM line, use your phone focus or do not disturb settings to silence the business line in the evening. Customers respect a business that answers promptly during stated hours far more than one that answers at midnight and sounds tired.
Record a proper voicemail greeting for the business line, with your business name, your hours and a promise of when you will call back. A clear greeting turns a missed call into a message you can return, instead of a lost customer. If you have never written one before, our guide on how to record a professional voicemail greeting for a small business walks through the wording and the recording step by step.
Keep your business contacts separate too. Save clients under your business line where your phone allows it, and use a different ringtone for the business number so you can decide in a second whether to answer. When you call a client back, always dial from the business line. One call from your personal number can undo months of careful separation, because the customer will save that number and use it next time.
Mistakes to Avoid With a Second Business Number
The most common mistake is choosing a number that cannot do the job you bought it for. A cheap internet number may look like a bargain, but if it cannot receive verification codes from your bank or your marketplace account, it will cost you far more in lost time than it saved. Always test verification on the services that matter to you before you print the number on a business card.
The second mistake is mixing the lines. If you answer business calls on your personal number because it is easier, clients will keep calling that number, and the boundary you paid for will vanish. Make the business line the only number on your website, your invoices and your profiles, and be disciplined about using it.
The third mistake is forgetting security. Your business number is tied to your WhatsApp account, your marketplace logins and often your banking verification, so protect it like any other business asset. Use a strong unique password on every account linked to the number, turn on two factor authentication where it is offered, and consider reading our guide on how to set up a password manager for a small team so no one on your team reuses a weak password on a business account.
Finally, do not publish the number and then ignore it. A business number that rings out with no voicemail and no reply sends a worse message than no number at all. Check the line at least twice a day during working hours, and set an away message on WhatsApp Business so customers always know when to expect a reply.
Conclusion
Learning how to use a second phone number for business UK owners can rely on comes down to three decisions. Choose the right type of number for your needs, a real mobile number if you need verification and WhatsApp, or a virtual number if you want a local area code and business hours. Set it up properly, label the line, test it and put it everywhere your personal number used to be. Then use it with discipline, with set hours, a proper voicemail greeting and a WhatsApp Business profile that answers customers even when you are busy.
Priya made the switch in one afternoon. She moved her website and marketplace listings to a second number on an eSIM, set her business hours to nine until six, and recorded a short voicemail greeting. The late night calls stopped, her clients still reach her easily, and her personal phone is hers again. Your business deserves the same boundary, and it costs less than a takeaway coffee each week to keep it.
Frequently Asked Questions
Can I have two phone numbers on one phone in the UK?
Yes. Most modern phones support dual SIM or one physical SIM plus an eSIM, so two numbers stay active on the same handset. You can also use a virtual number that forwards calls to your existing phone without any second SIM at all.
How much does a second phone number for business cost in the UK?
A pay as you go second SIM can cost £5 or less to start, an eSIM business number is usually around £5 to £6 a month, and a virtual business number is typically £5 to £15 a month depending on the features you choose.
Can I use a second phone number for WhatsApp Business?
Yes, and it is one of the best uses for a second number. Register WhatsApp Business with the second number and verify it by text or voice call. Use a real mobile number from a SIM or eSIM, because WhatsApp often blocks internet based virtual numbers.
Do I need a second phone to have a second business number?
No. You can run a second number on the phone you already own using a second SIM, an eSIM, or a virtual number that forwards to your current mobile. A second handset is only needed if you want to keep work on a completely separate device.
Will a second business number work for marketplace and bank verification?
A real 07 mobile number on a UK network usually passes verification for marketplaces, banks and payment providers. Virtual numbers that use internet calling ranges are more likely to be rejected, so test verification before you rely on a virtual number for that purpose.
