A virtual phone number is a phone number that isn't tied to a physical SIM card in your phone. It runs on a provider's infrastructure, and incoming texts or calls are delivered to you through an online panel or an app.
The term covers very different products. A company's customer support line and a temporary number used to receive a sign-up code are both called virtual numbers, so it helps to separate the types first.
Types of virtual numbers
| Type | What it's for | How long you keep it | Calls / SMS |
|---|---|---|---|
| Business (VoIP) number | Routes incoming calls to a call center or staff phones | Long term, by subscription | Mostly calls |
| Second-line app | Adds a separate number for calls and texts on your own phone | As long as you subscribe | Calls and SMS |
| SMS verification number | Receives a verification code when signing up for a platform | A few minutes | SMS only |
An eSIM is not a virtual number. It replaces the physical card with a digital one, but the number is still a regular mobile line registered to you and running on your phone.
VoIP numbers and why some platforms reject them
Many business numbers and second-line apps are VoIP numbers: they run over the internet rather than a mobile network. Some platforms don't accept VoIP numbers for verification, because they can be created in large numbers and aren't tied to a physical line. Security guidance reflects this caution too: NIST's digital identity guidelines treat SMS and phone-based codes as a restricted method because of how easily they can be redirected. This is why a free second-line app number often fails when you try to verify WhatsApp, a bank or a marketplace.
How does an SMS verification number work?
This kind of number is a real line from a mobile carrier abroad. The difference is that the line sits in a system that reads incoming texts automatically, not in your phone. When you place an order, the number is set aside for your request for a short time and the verification code sent to it appears in your panel.
On Onay360, you choose the service you want to verify and a country, then get a number. Orders stay active for 5 minutes; if no code arrives, the order is cancelled automatically and the amount returns to your balance. The full flow, from order to code, is explained in our guide to how verification works.
Can you create your own virtual number?
Not as an individual. Phone numbers belong to carriers and are provided to users through a service. Businesses get numbers through a telecom subscription; for a sign-up code, people use a temporary phone number from an SMS verification service.
Online "random phone number generator" tools don't give you a real line. The numbers they produce are only correctly formatted; nobody can read texts sent to them.
How much does a virtual number cost?
It depends on the type. Business numbers are usually billed monthly. SMS verification numbers have no subscription: you pay only for the number you get, and the price depends on the service you're verifying and the country you choose. Current prices are on Onay360's pricing page, visible without an account.
How free "receive SMS online" sites work, and why they're risky, is covered in our comparison of free and paid numbers.
When to use one, and when not to
An SMS verification number is useful when:
- You want to try an app or service without sharing your personal number.
- The platform you want doesn't accept sign-ups from your country.
- You don't want your personal number added to marketing lists.
For banking, government services, payment apps and main accounts you'll keep for years, use your own number. On those accounts, the number is used for more than sign-up: it confirms transactions and recovers access.
Limits to keep in mind
- Verification numbers are assigned for a short time; you can't access the same number later.
- The target platform decides whether a code is sent. It can reject a number.
- A virtual number doesn't make you anonymous. Platforms can also recognize you by device, IP address and usage.
For longer-term needs, see how one-time and rental numbers compare; for security, read our guide to risks and precautions.