How to get your office number ringing on your mobile
Three ways to have your business number ring your mobile, what each costs, and which one suits a sole trader, a small team or a business with staff working from home.
Published 24 June 2026 · updated 20 August 2026
This comes up more than almost anything else. Someone wants their business number to reach them when they are not sitting at a desk, and they are not sure whether that means an app, a divert, or a whole new phone system.
There are three answers, and they suit different situations.
Option one: a landline number that diverts to your mobile
The simplest version. You get a proper local number, an 028 number if you are here, and calls to it ring the mobile already in your pocket. No handsets, no system, nothing installed.
Who it suits: sole traders, trades working out of a van, consultants, new businesses that want to look established before they are.
Why bother, if you already have a mobile: because a lot of customers still judge a business by its number. A landline suggests premises and permanence. A mobile number on a quote suggests one person with a van, which may be exactly what you are, but it quietly costs you work you never hear about.
What it costs: £15 a month with us. Details here.
The limitation: you cannot transfer a call to a colleague, because there is no system underneath it. If two of you need to pass calls between you, this is not enough.
Option two: the mobile app on a hosted phone system
If you have a phone system, your mobile can simply be an extension of it. Install the app, log in, and your phone behaves exactly like the handset on your desk. Same number, same ability to transfer, park a call, and pick up a call somebody parked for you.
Who it suits: anyone with staff who move around. Field engineers, sales people, anyone splitting time between home and the office, warehouse staff who are never near a desk.
What it costs: nothing extra. The apps are included with every plan, which surprises people who have been quoted per-user app licences elsewhere.
Why it beats a divert: a divert sends the call away from your system. The app keeps it inside it, so all the useful things still work. You can transfer to reception. Your colleagues can see you are on a call. Your call recording still runs.
Option three: simultaneous ringing
Not really a separate product, more a setting, but it is the one people are usually actually asking for.
A call to the office number rings your desk phone, your laptop and your mobile all at the same time. Whichever you pick up first takes the call and the others stop.
Who it suits: almost everyone, honestly. It is the setting we turn on most often. Somebody working from home, or out on a job, simply gets the calls meant for them without anyone doing anything.
What it costs: nothing. It is included as standard.
Which should you pick?
If you are on your own and want to look bigger, option one.
If there are two or more of you and calls need to move between people, you want a hosted phone system at £10 a phone, and then options two and three come free with it.
If you already have a phone system and are paying extra for a mobile app, it is worth asking your provider why.
One practical note
Whichever you choose, keep your existing number. It is on your van, your signage, your Google listing and in the phones of every customer who has ever rung you. Numbers transfer between providers, it is routine, and any supplier suggesting you need a new one should be asked why.