A second phone number, without a second phone.
SpareLine is a real phone number that lives in an app. It calls and texts ordinary phones — not only other users of the app — and every call is priced before it connects, paid from credit you top up yourself. No second SIM, no contract, no swapping devices.
0
Extra SIM cards needed
5
Platforms, one account
Prepaid
No contract, no bundle
Every call
Priced before it connects
A real phone line, minus the SIM.
Not everything a SIM does, though — there are things SpareLine cannot do, and they are written down rather than left to be discovered.
01
Pick a number, in the countries we open
Browse by country and number type — local, mobile, national or toll-free — see the price, and the number is on your account. Not every country is on sale: each one is opened deliberately, the list grows, and some countries require proof of identity or a local address before a number can be activated. The app tells you which before you pay.
02
Call and text ordinary phones
Place and receive voice calls and SMS to any phone, not only to other app users. Your SpareLine number is the caller ID, so replies come back to the right line. Text messages only for now — no picture messages yet.
03
Decide what a missed call does
Forward the call onward to another phone — always, or only when you do not pick up, or only when no device of yours is reachable. Let voicemail take it, and the message arrives in the app with the date it will be deleted on. Or have SpareLine text the caller back automatically, in your own words. Each number decides for itself, so a work line and a marketplace line need not behave alike.
04
See the price before you dial
SpareLine quotes the per-minute rate for the destination before the call starts, holds the funds for it from your balance, and shows the cost as the call runs. When the balance is running low you are warned rather than cut off mid-sentence.
05
Prepaid, so there is nothing to cancel
Top up a balance with a card and spend it on numbers and usage. A number renews monthly and you can switch off its renewal or release it whenever you like; the app itself costs nothing and holds no subscription of its own.
06
Several numbers, one account
Hold as many numbers as you want on one balance. Each has its own messages, its own call history and its own settings, and you choose per call which one you are calling from — a work line, a marketplace line and a home line stay separate.
07
Keep your private number private
Give out a spare line for classifieds, sign-ups, deliveries and dating instead of your personal one. When you are done with a number, release it and the noise stops with it — your other lines are untouched.
08
One line, every device
Answer on your phone, keep typing on your laptop. Numbers, conversations and call history are the same on Android, iOS, Windows, macOS and the web. The account lists every signed-in device and you can sign one out from any of the others.
09
Real invoices, real VAT
Top-ups and numbers produce proper invoices as PDFs, with EU VAT handled by where you are and whether you gave a VAT ID. Your balance, your charges and every invoice are in the app, not in an email you have to keep.
10
Notifications you decide
Choose which kinds of notification reach you — messages, calls, billing — instead of all or nothing. Incoming calls ring the device even when the app is closed on Android; on the other platforms the app has to be open for now.
Four steps to a working number.
Step 1
Sign in
Install SpareLine on any device you own and create an account. Your existing SIM stays exactly as it is — SpareLine sits beside it, not in place of it.
Step 2
Add credit
Top up a balance with a card. Numbers and calls are paid from it, so there is no bundle to pick and nothing that renews on its own.
Step 3
Choose a number
Search the countries and number types on sale, see what a number costs before you take it, and activate it. Countries with regulatory requirements say so, and what they ask for, up front.
Step 4
Call and text
Dial, message and pick up incoming calls in the app. Pick which of your numbers a call goes out from, and see what a minute costs before it connects.
A number for every part of your life.
Work on your own phone
A business line beside your personal one — same device, separate identity, separate history. After hours, let voicemail or an automatic reply take it instead of turning your own phone off.
Buying and selling online
Post a spare number on marketplaces and classifieds instead of your own, and release it when the sale is done.
Travel
Hold a number in the country you are dealing with, so hotels, clients and hosts reach a local line instead of an international one.
Family abroad
Keep a number in your home country so relatives dial a local call, wherever you actually live.
Dating and new contacts
Share a number you can retire the moment a conversation stops being welcome, without changing the number your friends have.
A line per project
One number per client, per listing or per side project, each with its own messages and call history, all on one balance.
Everything you already use — starting with the browser.
One account, five apps, and your numbers, conversations and call history the same on all of them. The browser, Android and Windows are open today, with everything working — calls both ways, messages, top-ups. The other apps follow.
What SpareLine does not do.
A number in an app is not a SIM card, and the differences are worth knowing before you rely on one rather than after.
No emergency calls
SpareLine cannot reach 112, 911 or any other emergency number, and it does not pass on your location. In an emergency, use the phone app that came with your device.
Not a replacement for your SIM
SpareLine needs Wi‑Fi or mobile data to work. Where there is no data there is no SpareLine, and your own operator line is what still rings.
Text messages only
SMS is sent and received. Picture and group messages (MMS) are not carried yet, and a sender who tries one will not reach you.
Some services refuse virtual numbers
Banks and a few large platforms reject numbers like these for sign-up codes. Where that happens it is their rule, and no virtual number gets around it.
Frequently asked
Do I need a second SIM card?
No. A SpareLine number lives in the app and works over Wi‑Fi or mobile data, alongside the SIM you already have. It does not replace that SIM — with no data connection, SpareLine cannot call.
Which countries can I get a number from?
The countries SpareLine has opened, which is a growing selection rather than the whole world. The current list, the number types available in each, and the price are all in the app before you pay for anything.
Why does one country ask for documents and another does not?
Regulators, not SpareLine. Some countries require proof of identity or an address in the country before a number is activated. Where that applies, the app says so and shows what is asked for before you commit.
Can I call and text ordinary phones?
Yes — that is the point. Calls and SMS go to any phone number, and your SpareLine number shows as the caller ID so replies come back to the right line. Picture messages (MMS) are not carried yet.
What happens if I do not answer?
Whatever you have told that number to do. It can forward the call to another phone, send it to voicemail, or text the caller back automatically — each number is set separately, so your work line and your marketplace line can behave differently.
Can I forward calls to my normal phone?
Yes, to any number you choose. Forward every call, only the ones you do not pick up, or only the ones that arrive when none of your devices is reachable. You set how long the forwarded leg rings and a daily cap on forwarded minutes, because a forwarded call is a call SpareLine places and pays for.
How does voicemail work?
It is off until you switch it on, and you switch it on one number at a time. Messages appear in the app with the date each one will be deleted on, and you can delete one sooner. Answering a call to take a message is a connected call, so it is charged like one.
What does the automatic reply send?
A text message to the caller when nobody answered — your own wording, or a standard line if you do not write one. It is an ordinary SMS, charged like one, so you can cap how much a single reply may cost and how often the same caller gets one.
Can I call emergency numbers?
No. SpareLine cannot reach 112, 911 or any other emergency number, and it does not pass on your location. Always use the phone app that came with your device for that.
Can I receive SMS verification codes?
Incoming SMS arrives in the app like any other message. Some services — banks especially — refuse virtual numbers for their codes, and no virtual number gets around that.
How am I charged?
Prepaid. You top up a balance with a card, and numbers and usage are paid from it. A call is priced before it connects and its cost is shown as it runs, so nothing arrives as a surprise at the end of a month.
What happens if my balance runs out during a call?
You are warned while the call is still going, with enough left to finish a sentence. If it does run out, the call ends rather than continuing into a debt.
How many numbers can I have?
Several on one account and one balance. Each has its own messages, call history and settings, and you choose which one a call goes out from.
What happens if I stop using a number?
Switch off its renewal or release it whenever you like. Calls and messages to it stop, your other lines are untouched, and you can take a new number any time.
Does it work on my computer?
Yes. It works in any modern browser and as a Windows app, with the same numbers and history as everywhere else. A macOS app comes later. Linux is not supported.
Which phone apps are there?
The Android app is in Google Play now, with calls both ways, messages, numbers and top-ups, and your account, numbers and history are the same as in the browser. iOS comes after that; until then an iPhone uses the browser.
Will incoming calls ring when the app is closed?
On Android, yes. On the other platforms the app needs to be open for now — that is being worked on, and until it works it is not claimed.
Do I get a proper invoice?
Yes. Top-ups and numbers produce PDF invoices with EU VAT handled by where you are, and a VAT ID if you give one. They are kept in the app rather than only mailed to you.
Get started.
SpareLine runs in the browser, as an Android app and as a Windows app, with calls both ways, messages and top-ups. There is no invitation to ask for: sign in and set up your first number. The apps for iOS and macOS come later.
Questions first? ppa.enileraps@troppus