What a virtual phone number is, how it receives SMS and calls, and what it is used for

What a virtual phone number is

A virtual phone number is not tied to a physical SIM card or to one specific device. It is hosted in software, usually behind a website, an app, or a messaging platform, and it routes calls and SMS to wherever you want to receive them.

To anyone sending you a message or calling you, the number looks and behaves like an ordinary phone number. The difference sits in the backend: instead of being registered on a SIM in a phone, the number runs on a service that stores incoming messages and forwards traffic according to rules you set.

These numbers are sometimes described as cloud numbers or VoIP numbers. The exact features vary between services, so it is worth reading what a specific number can actually do before you depend on it for anything that matters.

• A number that only receives SMS.
• A number that receives SMS and also handles voice calls.
• A number rented for a fixed period rather than bought outright.
• A number that forwards messages somewhere else, such as a chat or a webhook.

How a virtual number receives SMS and calls

When someone sends an SMS to a virtual number, the message reaches the service hosting the number. From there it is normally shown in a web dashboard, or forwarded to a place you choose, such as a chat or a webhook. This is how you can read a verification code without giving out your personal mobile number.

Calls follow a similar path. When someone dials the number, the service passes the call on to the destination you configured, which may be another phone, a softphone application, or a voicemail box. On some services you can also answer directly in the web interface.

Forwarding rules are the part worth checking first. Look at whether SMS can be forwarded to a chat or a webhook, whether calls can be answered or only surfaced as a notification, and what happens to messages while you are offline.

• Where incoming SMS appear: dashboard, chat, webhook, or all of these.
• Whether the number also accepts voice calls.
• How long messages are stored before they are deleted.
• Whether the number is private or shared with other users.

The main types of virtual phone numbers

Not every virtual number does the same job. The categories you will meet most often are:

Which type you need depends on what the platform you are signing up for actually asks for. A service that sends a code as a voice call will not work with an SMS-only number, and a service that only sends text messages needs nothing more than that.

• SMS-only numbers, built to receive text messages such as verification codes.
• SMS and call numbers, which handle both text messages and voice calls.
• Long-term rentals, held for a set period such as a month, with the option to renew.
• Short-term or one-time numbers, used for a single task and then released.
• Numbers with forwarding, which pass incoming messages to a chat or a webhook instead of only showing them in a dashboard.

What people use virtual numbers for

The most common reason is account verification: a platform sends a code to the number, you read the code, and you complete the signup without using your personal line. Beyond that, the use cases are varied:

Whatever the reason, check the rules of the platform you are signing up for before you get a number. Some services restrict which kinds of numbers they accept, and some do not allow signups with rented numbers at all.

• Receiving verification codes for apps and websites.
• Keeping work messages separate from personal messages.
• Testing how a product handles SMS or voice without buying a SIM for each test.
• Giving a project, a shop, or a community its own line.
• Staying reachable with a local number while travelling.

How to choose a virtual phone number

Start with what the number has to do. If you only need to read a text code, an SMS number is enough. If a platform might call you, or send a code as a voice call, choose a number that handles both SMS and calls.

Then look at the practical details: which countries the numbers cover, how long a rental lasts, whether it renews automatically, how you can read incoming messages, and which payment methods are available.

The service we recommend is SMS Activate App (sms-activate.app). It rents private numbers that are not shared with other users, for 28 days at a time, from $8. Renewal happens automatically every 28 days while your balance covers it, and you can switch it off. Numbers are currently available in Australia, Canada, United Kingdom, Israel, Puerto Rico, Sweden, and United States, and each number receives both SMS and calls. You manage everything on the website or through the Telegram bot, you can top up by bank card or cryptocurrency, and incoming SMS can be forwarded to a Telegram chat or a webhook.

One detail to keep in mind: the rental fee is non-refundable. Check that a number fits the platform you need it for before you pay, because you will not get the fee back if the number turns out not to suit that platform.