A VoIP phone system for UK businesses, with no handsets
A VoIP phone system carries your business calls over the internet instead of a copper phone line. Line gives you a UK business number that works over Wi-Fi or mobile data, in an app on the mobile and laptop you already own. Routing, voicemail, texts, and a shared inbox come with it.
From £4 a month. Pay only for the calls and texts you use. No minimum term.
- Incoming call · office Wi-FiAnswered on the laptop
Morning, it's the site manager at Elm Road. Can you come by at two?
Yes, I'll be there at two.
Jo · from the laptop- Outbound call · 4G in the vanSame number, 45 minutes later
Call · 2 min
Logged to the Elm Road thread with the transcript.
Quick answers
- What is VoIP?
- Voice over Internet Protocol. Your call travels over the internet instead of a traditional phone line. The person you call notices nothing.
- What do I need?
- The Line app and about 100 kbps of upload and download per call. Almost any UK broadband, 4G, or 5G connection carries several calls at once.
- Can I call normal phone numbers?
- Yes. VoIP calls reach any UK mobile or landline. The other person does not need VoIP or an app.
Will VoIP work on your connection?
Enter the upload and download speeds from any broadband speed test.
80
Enough for 80 calls at the same time.
100 kbps per call each way, with a fifth of the line left for everything else. Your upload speed sets the limit.
What each part does for you
The same business number rings whichever devices you choose, wherever they are.
Answer on whatever is in front of you
Laptop at the desk, mobile in the van. The number and the history are the same on both, so no customer hears 'I'll call you back from the office'.
Wi-Fi or mobile data
The app uses whichever connection the phone has. When the office broadband is down, calls still ring over 4G or 5G.
Routing before it rings
Opening hours, ring-all, voicemail, missed-call texts, and the AI receptionist sit in front of every call, so no call rings out unanswered.
Calls next to texts
Each call is logged in the customer's thread with their texts and your notes. Nobody hunts through a separate call log.
Your business caller ID
Outgoing calls show your business number. Customers see a number they know, and call the business back, not your personal phone.
Nothing left on copper
Line does not use the analogue network, so the January 2027 switch-off changes nothing for you.
Who runs their calls on Line
Trades
Take calls in the van over 4G and log each one to the job.
Estate agents
The branch number rings the office and the agents out on viewings.
Removals
Crews on the road answer the office number from their own phones.
Solicitors
Fee earners take client calls at home or in the office on one number.
Garages and MOT centres
Answer from the workshop floor without walking to a desk phone.
Accountants
One practice number for hybrid teams, with every call in the client's record.
Set up in an afternoon
No engineer, no hardware, no contract. Three steps from sign-up to your first call.
- 1
Check your connection
Use the check above with a speed test from the Wi-Fi and mobile network you use during the day.
- 2
Add your number
Pick a new UK number or move the one customers already call.
- 3
Test the edge cases
Inbound, outbound, no answer, out of hours, and caller ID. Then tell your customers.
What makes a VoIP call work
A good connection and good routing. Line handles the routing for you.
| When this happens | Line does this | So you get |
|---|---|---|
| Solid Wi-Fi or 4G | The app rings and carries the call over the live connection. | Clear audio on the device you're holding. |
| You're busy or offline | The call moves to the next step instead of ringing forever. | A teammate, voicemail, a text, or the AI receptionist picks it up. |
| You call a customer back | The call goes out through Line with your business caller ID. | Customers see the number they know. |
Landline, Wi-Fi calling, or VoIP
Three ways a UK business can take calls in 2026, side by side.
| Traditional landline | Mobile Wi-Fi calling | Line (VoIP) | |
|---|---|---|---|
| What it is | A copper phone line into one building | Your mobile network carrying your personal number over Wi-Fi | Your business number in an app, over any internet connection |
| Works after January 2027 | No. The analogue network closes | Yes | Yes |
| A separate business number | Yes | No. It's your personal number | Yes |
| Rings several people | Only with extra equipment | No | Yes |
| Answer on a laptop | No | No | Yes |
| Texts from the business number | No | No | Yes |
| What you need | A phone line and a desk phone | A phone and network that support Wi-Fi calling | About 100 kbps per call, each way |
| 999 calls | Yes | Yes | No. Use your phone's own dialler |
Worth knowing
Questions people ask
Straight answers on setup, limits, and what it costs.
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Business phone systems compared
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PSTN switch-off guide
Get ready for the UK move to digital voice.
Last reviewed . Sources: Ofcom, Your landline is going digital, Twilio, Voice SDK network connectivity requirements.
Never miss another customer
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