Virtual Numbers, Burner Phones and eSIMs: What Actually Differs
7 min read
“Burner number” gets used for four quite different things, and the differences decide whether the one you pick will work for you. Here is what each actually is.
Virtual numbers
A number that exists in software rather than on a SIM. A provider leases number ranges from carriers and routes inbound messages to an application — a web page, an API, a webhook. This site is one of these.
Costs: free to a few dollars a month. Gets you: instant availability, no hardware, no identity documents, and numbers in countries you have never visited. Costs you: classification. These numbers sit in databases as non-fixed VoIP, and any service that checks will know. Banks refuse them universally.
Prepaid burner SIMs
A physical pay-as-you-go SIM bought with cash. The original burner, and still the only option in this list that is indistinguishable from a normal subscriber line — because it is one.
Costs: the SIM plus credit, and a trip to a shop. Gets you: a number nothing rejects. Costs you: friction, a spare handset or slot, and, in a growing list of countries, mandatory identity registration — which removes most of the anonymity that was the point. Germany, Spain, and much of Asia require ID at purchase.
A second eSIM line
Modern phones hold multiple eSIM profiles, so you can carry a second real line on the same device, often on a cheap data-and-SMS plan or a travel provider.
Costs: a few dollars a month upward. Gets you: a genuine carrier number with normal delivery, on the phone you already carry, switchable in settings. Costs you: a compatible phone, usually identity verification, and a recurring bill. Also worth knowing: many travel eSIMs are data-only and cannot receive SMS at all, which people discover after buying one.
Second-number apps
Google Voice, Burner, Hushed and similar: an app that gives you an additional number backed by the provider’s infrastructure.
Costs: free to roughly ten dollars a month. Gets you: a usable second number with calls and texts in one place. Costs you: availability — Google Voice needs a US number to set up in the first place — and the same classification problem as virtual numbers, since that is what they are. Services that block VoIP block these too.
The question that decides it
Ask what the number is protecting. If the answer is “nothing much” — a trial, a wifi portal, a marketplace listing, a forum — a virtual number is the right tool and paying for anything else is waste.
If the answer is “an account I would be upset to lose”, none of these are right. Not because they will not work today, but because a number you do not control is a number you can lose: a free public one is readable by anyone, a subscription lapses, a provider recycles the range. Recovering an account whose second factor points at a number someone else now holds ranges from painful to impossible. For those accounts use a real line you keep, or better, drop SMS as the second factor and use an authenticator app or a passkey.
A rough decision table
| If you need | Use |
|---|---|
| A code once, for something disposable | A free public number |
| Repeatable testing, or a webhook | A private virtual number |
| A second number you will keep for years | A second eSIM line |
| To pass a bank or government check | A real subscriber SIM, nothing else |
| To secure an account that matters | Not SMS — an authenticator app or passkey |