Why Separate at All
Most people running something small start by handing out their personal mobile. It works until it does not — typically the first Sunday a customer rings about an order, or the first time a supplier sells a contact list. By then the number is in too many places to take back.
You can switch it off
A separate number can be silenced at six o’clock without silencing your family. This is the entire point, and it is worth more than any feature on a comparison table.
Your personal number stops circulating
Give a personal number to suppliers, marketplaces and customers and it ends up in databases you cannot reach. A work number can be replaced; your number of fifteen years cannot.
Handover becomes possible
When someone else takes over the role, or you sell the business, a work number transfers. A personal number means customers keep calling you for years.
You can look local to customers
A number in the country or city you sell into gets answered more often than an unfamiliar international one, and costs your customer less to dial.
Records stay separate
Call logs, texts and voicemail for work sit apart from personal ones, which matters for expenses, disputes and anything that might later need evidence.
None of this requires carrying two phones, which is the assumption that stops most people from bothering. A second number and a second device stopped being the same thing some years ago.
The Four Ways to Do It
A software number in an app or browser
Most sole traders, freelancers and small teamsA real number from a national numbering plan, delivered to an app or a browser tab on the phone you already carry. No SIM, no extra hardware.
- Works on the device you own, alongside your normal number
- Numbers available in many countries, not just your own
- Separate ringtone, separate inbox, separate call history
- Cancel or replace without touching your personal line
- Usually the cheapest option per month
- Depends on a data or wi-fi connection
- Inbound SMS is not available on every number range
A second SIM or eSIM from a carrier
People who must receive bank codes on the work lineA second carrier line in the same phone, on a dual-SIM or eSIM-capable handset.
- Works on the mobile network, no data connection needed
- A genuine mobile number, so verification codes arrive reliably
- Native dialler integration
- A second monthly contract, usually the most expensive route
- Only in the country the carrier operates in
- Occupies your eSIM slot, which you may want for travel data
- Cannot be handed over easily
A second physical handset
Regulated roles, or anyone whose boundary keeps failingAn actual second phone, with its own number and its own contract.
- The hardest possible boundary — you can leave it in a drawer
- No configuration to get wrong
- Total separation of data and accounts
- You carry two phones and charge two phones
- The most expensive option by a distance
- Two devices to lose, break and replace
A hosted desk line or PBX
Teams where several people answer the same numberA business phone system with extensions, hunt groups and a receptionist flow.
- Routes to whichever colleague is free
- Menus, queues, reporting and recording
- Scales past one person cleanly
- Per-seat pricing regardless of how much you use it
- Configuration overhead nobody wants for one line
- Overkill below roughly five people
Side by Side
| Software number | Second SIM | Second phone | Hosted PBX | |
|---|---|---|---|---|
| Extra hardware needed | No | No | Yes | No |
| Works without data | No | Yes | Yes | Depends |
| Number in another country | Yes | No | No | Sometimes |
| Reliable for bank codes | On mobile ranges | Yes | Yes | Rarely |
| Transfers to a colleague | Yes | Awkward | Yes | Yes |
| Typical monthly cost | Lowest | Medium | Highest | Per seat |
What It Actually Costs
A software number is normally a small monthly rental plus per-minute and per-message usage. A second carrier line is a second contract, priced like a phone plan whether or not you use it. A hosted system charges per seat. The gap between the cheapest and most expensive of these is large — often an order of magnitude for a single user.
The structural point worth internalising is that outbound call cost is set by the destination you dial, not the number you dial from. A work number in London does not make calls to London free. If most of your cost is outbound international minutes, changing your number will not help; changing your per-minute rate will. The rate checker prices any route against current carrier decks, and our cost comparison of business phone systems and browser calling works through the arithmetic at team scale.
Cost lines to check before committing
- Monthly rental for the number itself.
- Per-minute outbound, by the destinations you actually call.
- Per-minute inbound, which is not always zero — particularly on toll-free.
- Per-message SMS, in and out, plus any registration fees.
- Minimum contract term, and what happens if you stop.
Which Country to Put It In
Pick the country your customers are in, not the one you are in. A number that looks local gets answered; an unfamiliar international prefix gets ignored, and in some markets it costs the caller money to ring you.
The constraint is that availability and paperwork vary enormously by country — some sell freely, some want proof of a local address, and a few will not issue to a foreign business at all. Check what is actually obtainable before you build a plan around it; the details are in how to get a virtual phone number in any country, and live availability is on the numbers by country pages.
One caution if the work line needs to receive verification codes from banks: those are usually only delivered to mobile ranges. A local landline-style number will take customer calls perfectly well and quietly fail at that one job.
What None of Them Fix
Worth saying plainly, because every provider in this market implies otherwise: a second number is a tool for enforcing a boundary you have already decided on. It does not create one.
If you answer the work line at eleven at night, you have simply moved the problem onto a different ringtone. The people who get value from this set quiet hours and let voicemail take the rest — and the number only helps because it makes that decision enforceable rather than making it for you.
Worth deciding before you buy
- The hours the work line rings, and what happens outside them.
- Whether voicemail is answered daily or not at all.
- What the outgoing greeting tells people about response times.
- Who else, if anyone, will need to answer it later.
Setting It Up Properly
- 1
Pick the country your customers dial from
Not the country you are sitting in. This is the decision that is expensive to reverse once the number is printed on things.
- 2
Confirm the capabilities you need
Voice, inbound SMS and outbound SMS are provisioned separately. Check all three before buying if you need all three.
- 3
Give it a distinct ringtone
The separation only works if you can tell which line is ringing before you answer.
- 4
Record a greeting that sets expectations
Naming your hours in the voicemail greeting prevents most out-of-hours frustration on its own.
- 5
Set quiet hours from day one
Configure them before the number is in circulation. Retrofitting a boundary onto an existing habit rarely works.
- 6
Put it everywhere at once
Website, invoices, email signature, marketplace listings, business cards. A half-migrated number means both lines ring forever.
- 7
Test from an outside line
Call and text it from a phone not on your account. Check the caller ID your customers see is the work number, not your personal one.
Common Questions
- Can I keep the number if I change providers?
- Usually. Numbers are generally portable between providers within the same country, though the process takes days and both sides must cooperate. Confirm portability before you commit, particularly for a number you will print on anything.
- Will people see my personal number when I call from the work one?
- No, provided you place the call through the work line rather than the phone’s normal dialler. That is the one habit to get right — dialling from the wrong place is how personal numbers leak.
- Can I get a work number in a country I do not live in?
- Often yes, subject to that country’s documentation rules. Some require a local address or a registered local entity.
- Do I need a business registration to buy one?
- Not usually for a standard number. Some countries and some number types — toll-free in particular — do require company details.
- What happens to the number if I stop paying?
- It returns to the carrier pool and can be reissued to someone else. Anything still pointing at it, including two-factor codes, goes with it.
Add a work number to the phone you have
A real number in your choice of country, ringing in your browser or app alongside your personal line — with calling, texting and eSIM data on one account. No credit card required to sign up.
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