TL;DR
A temporary phone number is a second number you use for a while and then drop, so your real one stays private. The free public ones that come up first in search are shared with thousands of other people, which is why they fail the moment something needs a verification code. If the number has to receive a code, or has to last longer than an afternoon, it needs to go only to you, which means a paid app-based number or a local prepaid SIM.
What people mean by a "temporary number"
The words get used interchangeably and they do not mean the same thing.
Term | What it actually is | Receives verification codes? | Best for |
|---|---|---|---|
Temporary or disposable number | Umbrella term for any number you plan to stop using | Depends entirely on the type below | Nothing on its own, it is a category |
Burner number | A number you delete when you are done, usually inside an app | Usually, if it is dedicated to you | Marketplace listings, dating, side work |
Public SMS number | A shared number on a website, inbox visible to anyone | Rarely | Throwaway signups you will never log back into |
Virtual number | Any number not tied to a SIM card in a phone | Depends on the range it sits in | Second lines, business lines |
VoIP number | A number that routes calls and texts over the internet | Sometimes, and some services block it | Cheap calling, second lines |
Non-VoIP number | A number issued from a mobile network range | Yes, this is the one services trust | Bank and account verification |
Second line | A permanent extra number alongside your main one | Yes | Keeping work and personal apart |
Prepaid or pay as you go SIM | A physical or eSIM line from a local carrier | Yes, in the country that issued it | Living or working somewhere for months |
Data-only eSIM | Mobile data with no number attached | No, there is no number to receive them | Getting online abroad |
The split that matters is dedicated versus shared, and mobile range versus internet range. Almost every disappointment with temporary numbers traces back to one of those two things.
Why free "receive SMS online" sites usually let you down
These sites publish a handful of numbers and show the incoming messages to whoever loads the page. They are genuinely useful for one narrow job: signing up to something forgettable that you will never need to log back into. Outside that, they break in predictable ways.
The number is shared, so someone has almost certainly already registered it with the service you are trying to join. You get "this number is already in use" and there is no way around it.
The inbox is public. Anyone watching that number can read your code leaving your data vulnerable.
Messages do not stick around. Receive-SMSS, one of the biggest of these sites, keeps messages for 24 hours and retires numbers periodically.
You cannot get back in. When you lose the password, the recovery code goes to a number you no longer control.
The numbers sit in ranges that services have learned to distrust so they might not work at all.
VoIP, non-VoIP, and the real reason verification fails
Every phone number lives in a numbering range that identifies where it came from. Ranges issued to mobile carriers look different from ranges issued to internet telephony providers. VoIP, or voice over IP, simply means the calls and texts travel over the internet rather than over a traditional mobile network.
Banks, Google, and a long list of other services check that range before they send a code. Numbers that look internet-issued get refused, because they are cheap to create in bulk and cheap to abandon, which makes them useful to people creating fake accounts. WhatsApp is direct about it and lists VoIP numbers as unsupported for registration outright. This is why so many people report that a number worked fine for one signup and got rejected outright by the next one. A recurring complaint in a self-hosting thread on disposable numbers is exactly this pattern: developers picking a provider, finding it works for small services, then hitting a wall at the big ones.
There is no universal list of which services block what, and providers move between ranges. The practical rule is that the stricter the service, the more likely it wants a number from a mobile range with financial services being the strictest of all.
Choosing by what you actually need
One code, once, for something low stakes
A free public SMS site is fine, if you don’t care about the data being public. Expect to try three or four numbers before one is unused on that service, and accept that you are not getting back into the account later.
A number you control for months
This is the marketplace, dating, freelance-client, side-project case. You want a dedicated number, an app that keeps the history, and the ability to delete the number and take another one. That is a paid second-line app or an app-based number on subscription.
A number in a specific country
Country matters more than people expect. Some services will only accept a number with the right country code, and some banks will only text a domestic one. Your options narrow to providers that actually sell numbers in that country, which is a much shorter list than the general second-number market.
Your 2FA has to keep working while you travel
This is a different problem and it has a different answer. You do not need a new number, you need your existing one to keep receiving texts. The setup that works is your home SIM left active with data roaming switched off, and a separate data line handling your internet. Most current phones can run two lines at once with dual sims, so the home number keeps receiving SMS while the data comes from an eSIM which is typically cheaper than roaming. Move what you can to an authenticator app before you go, and save the backup codes.
You are moving abroad or want to
A local prepaid SIM in the country you are moving to can be tricky. Getting a number in your new country usually means identity verification, and in some places proof of address as well, which is the one thing nobody has in their first few weeks. You need an address to get a number, and a number to sort out the address.
If you have not moved yet, but plan to, it can be even worse. Applying for jobs with a foreign number tells every recruiter you are still overseas before they have read a word of your CV, and that is a decision you want them making later rather than sooner.
An app-based number in the country you are heading to solves both, because you can set it up months before you land and keep it running alongside the number you already have. The same works in reverse when you are the one leaving: keeping a number back home is what stops your old bank, your accountant, and your family from losing you. Once you are settled and have an address, add a local SIM anyway, since a mobile-range number is what domestic banks and government services will accept.
You only need data
Then you do not need a number at all, and paying for one is money wasted. A data-only plan covers maps, messaging apps, email and calls through WhatsApp or FaceTime. Calls and texts to ordinary phone numbers are the only thing you lose, and an app-based calling setup covers most of that.
Setting up a number that works, step by step
Decide the country the number needs to be in, before you compare providers. This eliminates most of them immediately.
Check the provider sells dedicated numbers, not shared ones. If the site shows you the number before you pay, it is shared.
Sign up and pick the number. Keep it, because most providers cannot give the same one back once you release it.
Send yourself a test message and place a test call before you register the number anywhere important.
Register your low-risk accounts first, then work up.
Country by country
United States
The widest choice, and the only market where the free-tier apps are genuinely usable. Google Voice is the obvious name, though Google's own setup guidance treats it as a US service, and getting a new number has become noticeably harder.
United Kingdom
UK numbers are straightforward to buy from app-based providers. A UK prepaid SIM is also easy to get and does not require residency, so if you are visiting anyway, that is the cheapest route to a genuine mobile-range number.
Australia
Fewer providers offer Australian numbers, so check availability before committing to a service. Australian prepaid SIMs require identity verification at activation, which usually means a passport for visitors.
Japan
Japan is the hard one. Voice-capable Japanese lines require identity verification, so a visitor cannot casually pick up a Japanese phone number for a two-week trip, and almost every tourist SIM and eSIM sold for Japan is data-only. The rules are tightening rather than loosening: the revision to Japan's Mobile Phone Improper Use Prevention Act extends identity checks to data-only SIMs as well. If you need a Japanese number for a service that demands one, an app-based Japanese number from a provider that sells them is realistically the only option short of a residency-backed contract.
Does an eSIM come with a phone number?
Not the travel kind. A data-only eSIM gives you mobile data and nothing else, so there is no number attached to it and nothing for a verification code to arrive at. Your own number is untouched by installing one, so don’t worrry that switching would change the number people already have for you. The relationship between the two is genuinely confusing, and it is covered properly in the explainer on whether eSIMs are attached to phone numbers.
Carrier eSIMs are a different thing. When your own mobile provider issues you an eSIM, that line does carry your number, because it is your normal contract delivered without a plastic card.
Before you trust any provider
Is the number dedicated to you, or shared? If the site displays it publicly, it is shared.
Who else can read the inbox? On free sites, everyone.
How long are messages kept, and can you export them?
Can you delete the number and get another one on the same subscription?
What happens when you stop paying? Most providers release the number within days.
Getting a number through Roamless
Roamless Numbers gives you a real US, Canada, UK, or Australia phone number that lives in the Roamless app rather than on a SIM, on a monthly or annual subscription, with incoming calls and SMS free and outbound paid from your Credits. It receives inbound SMS including 2FA and app verification codes, and because it runs over the internet, it needs a data connection to work. If you only need people to recognize your existing number when you call from abroad, our Verified Number service does that instead, at no cost to set up.
FAQ
Can I get a temporary phone number for free?
Yes, from public SMS sites, and it will work for signing up to something disposable. It will not reliably pass verification, the inbox is public, and you cannot recover the account later. Free second-line apps sit in between: the number is yours, but availability is mostly limited to the US.
Will a temporary number work for bank 2FA?
Assume not. Banks are the strictest category and most of them screen out numbers that look internet-issued. If your bank is the reason you are reading this, the safer fix is keeping your existing number reachable, or switching that account to an authenticator app.
Can I use a temporary number for WhatsApp?
Not an internet-based one. WhatsApp lists VoIP numbers as unsupported for registration, so app-based second numbers are the wrong tool for this specific job. Landline numbers are allowed, but only on the WhatsApp Business app or the Business Platform, and only if you skip the SMS option and use "Call me" to take the code as an automated voice call. Extensions are not supported. On the standard app you need a mobile number that is yours alone, since WhatsApp allows one account per number and a shared public number has almost always been claimed already.
Do temporary numbers expire?
Public ones cycle constantly, often within days. Subscription numbers stay yours while you keep paying and are usually released shortly after you stop, so a missed payment can cost you the number and the accounts attached to it.
Can I keep a temporary number permanently?
Yes, if you keep the subscription running. At that point it is simply a second line. Number porting is rarely offered on app-based numbers, so treat the number as borrowed rather than owned.
Can I get a temporary Japanese phone number?
Not from a tourist SIM, which will be data-only. Japanese voice lines require identity verification, so an app-based Japanese number from a provider that offers them is the practical route.
Is using a temporary number legal?
Using one to protect your privacy is entirely normal and legal in most countries. Using one to evade identity verification, run multiple accounts against a service's terms, or commit fraud is not, and providers cooperate with law enforcement.