For sole traders & freelancers
Look like a business, not just a personal mobile
Most sole traders start with their personal mobile and lose customers because the number doesn't feel "real". A UK landline number on the same phone fixes that - instant professionalism, no office, no second handset, no app to install.
From £5/month + VAT. Live in minutes. Cancel anytime.
Why a landline number changes how customers see you
Instant credibility
A 020, 0161 or 0121 number on your invoice signals you've been around. A 07 number alone reads as a brand-new side gig. Pricing and trust often follow the number.
Work/life separation
Give out your landline number for business; keep your personal mobile for friends and family. Both ring the same phone. You always know which call is which.
Move it with you
Take the business with you when you change mobile, change house, or change the divert target. The landline number is yours. No re-printing business cards every year.
Two ways to set up
Virtual Landline - £5/mo + VAT
A UK landline number that diverts inbound calls to your existing mobile. No SIM swap, no app, no setup. The simplest possible start.
Best for: just want a professional number for inbound calls.
Landline SIM - £10/user/mo + VAT
A real SIM/eSIM for your phone with your landline number on it. Outbound calls display the landline number. Unlimited UK calls and SMS (fair use). Adds the ability to call customers back as your business.
Best for: regularly calling customers, or you'll grow.
Frequently Asked Questions
What sole traders most often ask before signing up.
Why does a sole trader need a virtual landline?
Most sole traders start by giving out their personal mobile, then realise it doesn't read as a 'real' business. Customers hesitate to call a 07 number for a quote. Giving out a personal mobile also means there's no separation between work and life - every call could be a customer. A UK landline number on the same phone solves both: instant professionalism, clean work/personal separation.
What's the cheapest way to get a UK business number?
ONSIM Virtual Landline is £5/month + VAT - that's a UK 01/02 local or 03 national landline number that diverts to your existing mobile. No SIM swap. No app. No setup fee. It's the cheapest credible way to give your business a real landline number.
Do I need to be a registered company?
No. Sole traders, partnerships, limited companies and not-yet-registered side businesses can all sign up. You don't need a VAT number or company registration - just a UK billing address and a payment card.
Can I call customers back and have my landline number show?
Not on the £5 Virtual Landline plan (it's inbound only - outbound calls from your mobile show your normal mobile number). For outbound calls displaying your landline number, upgrade to ONSIM Landline SIM at £10/user/month + VAT. The SIM goes in your existing phone (no second handset) and your normal dialler shows the landline number when you call out.
What if my business grows and I take on people?
Add users to your account as you grow. With 2+ users on the Landline SIM you can set up hunt groups so calls to your business number ring across the whole team simultaneously or in sequence. You don't change provider when you scale.
Can I keep my number if I switch later?
Yes. UK number portability is mandatory. If you ever leave ONSIM, your landline number ports out to a new provider. Port-out fee is £20+VAT. See the keep-your-landline-number guide.
A real business number for £5/month
Live in minutes. No contract. 7,500+ UK businesses already use ONSIM - many started as sole traders.