How to hide your number to protect your privacy?

The numbers speak for themselves: with 73% of French internet users facing scams in 2025 and over 210,000 cases of identity theft annually, handing out your real phone number to just anyone has become risky. Sometimes, you just need to send an anonymous SMS to protect yourself or test a service. Not to commit fraud, but to stay in control of your data.

Here, I'll explain exactly how to do it, with methods that actually work and a comparison table to help you see things clearly.

The #31# myth: why hiding your number natively doesn't work for SMS

We've all thought it at some point: dialling #31# before the recipient's number to send an SMS with a hidden number. It's a very common mistake.

In reality, the #31# code is a network instruction that was designed only for voice calls (the GSM protocol). SMS, on the other hand, are transmitted over different protocols (SS7 or IP) where the technical architecture makes it mandatory to always transmit the sender's ID.

In short, if you type #31# before an SMS, your message will be sent, but your number will be clearly displayed on the recipient's screen. Let's look at the real solutions instead.

The 4 methods for sending an SMS without revealing your identity

Method 1 — Use an anonymous SMS web service

This is the easy option. Many online platforms allow you to send a free anonymous SMS directly from your browser. You type in the number, your text, and the message is sent via a generic number. There's nothing to install.

However, you need to be aware of the trade-offs:

• Often restricted destinations: many of these sites only cover North America.
• One-way communication: the recipient receives the message, but they usually can't reply.
• A mediocre user experience: expect interfaces loaded with ad banners.
• The personal data issue: your IP address is always logged, and some free sites monetise your browsing data.

In summary, it's a handy method for an immediate, one-off need. For more regular or secure use, it's better to move on to the following methods.

Method 2 — Get a disposable phone number

A disposable phone number is the modern equivalent of a prepaid SIM card. It's a temporary number (active for a few minutes or a few days) that isn't linked to any of your identity documents.

It's particularly useful in several situations:

• Verify a new account (social media, e-commerce) without giving out your personal number.
• Chat with a stranger from a classified ad (Gumtree, Facebook Marketplace) while keeping a safe distance.
• Test an app that requires an SMS verification code.

The use of these numbers has become widespread, to the point where some VPN providers now include disposable number generators in their packages. Technically, these numbers rely on the Cloud and VoIP, which makes them highly responsive.

A few things to keep in mind:

• It's perfect for one-off use (like receiving a PIN code).
• The lifespan is short, so don't use this number for important contacts.
• Some systems have become strict: many banks or government agencies detect and block the use of VoIP numbers.

Method 3 — Using a virtual number (VoIP)

Here, we're stepping it up a notch. A virtual SMS number is a real second phone number, stable over time, and managed through an app on your smartphone.

To understand the difference:

• A disposable number is designed to be used once and then discarded.
• A virtual number is designed to last, allowing you to separate your work and personal life or maintain a separate digital identity.

The main advantage is that you can both send AND receive SMS anonymously (from your contact's perspective). Well-known apps like Onoff, Burner or Google Voice dominate this market. Here's what you need to know if you're in Australia:

This is the best option if you're looking to send texts from another number on a regular basis.

Method 4 — Secure messaging apps with a burner number

This is the approach for privacy purists. The idea is to combine the anonymity of a number with the robustness of encryption. You get a burner number and use it solely to create an account on Signal or Telegram.

Why it's effective:

• End-to-end encryption: The content of your messages is mathematically unreadable to anyone, including the app developer.
• Disappearing messages: You can set up (especially on Signal) a self-destruct for your chats after they have been read.

This method requires a bit more setup, but it offers top-tier digital security without exposing your personal number to your contacts.

Comparison table — Which solution is right for your needs?

To put it simply: if you just want to send a quick message, a free web service will do the trick. If you need a real two-way conversation, you'll need to use a virtual number or a dedicated solution like SmsJuice.

Our solution: send an anonymous SMS in France in under 2 minutes

To overcome the limitations of existing tools, we've designed an approach that prioritises ease of use, without compromising on privacy.

It works in 4 simple steps:

1. Customise the sender: choose a name or nickname, or leave the field blank.
2. Type your message.
3. Enter the recipient's number.
4. Confirm send — all without having to create an account or provide any personal information.

What makes our tool different:

• The interface is clean, with no intrusive ads.
• We don't sell your browsing data.
• Routing is optimised for all French carriers.
• The tool is strictly GDPR compliant.
• Receiving replies is possible, as we use our own virtual number infrastructure.

We wanted to create an ethical alternative in this market. You can use our service for a free, anonymous SMS (or via our freemium options), resting assured that your data is not the product.

It's a tool designed to send an SMS anonymously in France, within a legal framework that respects your privacy.

Try SmsJuice — send anonymous SMS with no sign-up required

What the law says: anonymity, legal limits and responsibilities

Let's be clear: total anonymity doesn't exist on the internet when it comes to the law. Sending platforms are legally required to retain IP addresses and connection logs. In the event of a legal warrant (during a criminal investigation), these details are handed over to the authorities.

Identity protection is a serious matter. With a recent 700% increase in identity theft in France, wanting to remain anonymous is a perfectly legitimate right. But this right shouldn't be used as a shield for abuse.

What is completely legal:

• Protecting your privacy when communicating with a stranger (e.g., on Gumtree, dating apps).
• Testing the reliability of an online service without giving out your real number.
• Playing a harmless prank on an acquaintance.
• Discreetly sounding out a former employer or partner.

What is strictly illegal (and punishable under the Criminal Code):

• Harassment, whether psychological or sexual (Article 222-33-2-2 of the Penal Code).
• Threats, insults and intimidation (Articles 222-17 and following).
• Fraud and phishing attempts (Article 313-1).

Conclusion — Protect Your Privacy Today

Keeping control of your privacy and digital security has become essential. If you need to communicate without revealing your identity, try SmsJuice to send a free anonymous SMS in Australia, simply and with no sign-up required.