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 left and right has become risky. Sometimes, you simply 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 command designed only for voice calls (the GSM protocol). SMS, on the other hand, travel through different protocols (SS7 or IP) whose technical architecture requires the sender's ID to be systematically transmitted.

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 to send an SMS without revealing your identity

Method 1 — Use an anonymous SMS web service

This is the easiest solution. 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 should be aware of the downsides:

• Often restricted destinations: Many of these sites only cover North America.
• One-way communication: The recipient receives the message, but they generally cannot reply to it.
• An average user experience: Expect interfaces cluttered 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

The 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 is not linked to any of your identity documents.

This is particularly useful in several situations:

• Verify a new account (on social media, e-commerce sites) without giving your personal number.
• Communicate with a stranger from a classified ad (e.g., on a marketplace app) while maintaining a safe distance.
• Test an app that requires an SMS verification code.

The use of these numbers has become so common that some VPN providers now include disposable number generators in their packages. Technically, these numbers are based on Cloud and VoIP technology, making them highly responsive.

A few things to keep in mind:

• Perfect for one-off tasks (like receiving a PIN code).
• They have a short lifespan, so don't use this number for important contacts.
• Some systems are now very strict: many banks and government agencies detect and block the use of VoIP numbers.

Method 3 — Use a Virtual Number (VoIP)

Now, let's take it to the next level. A virtual number for SMS is a proper second phone number that is stable over time and managed through an app on your smartphone.

To understand the difference:

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

The biggest advantage is that you can both send AND receive SMS anonymously (from the other person's perspective). Well-known apps like Onoff, Burner, or Google Voice dominate this market. Here's what you need to know if you are in India:

This is the most suitable option if you're looking to send SMS with a different number on a regular basis.

Method 4 — Secure messaging apps with a disposable number

This is the approach for privacy purists. The idea is to combine the anonymity of a number with robust encryption. You get a disposable number, and you 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's publisher.
• 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 a very high level of digital security, without exposing your personal number to your contacts.

Comparison chart — Which solution should you choose for your needs?

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

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

Faced with the limitations of existing tools, we have designed an approach that prioritises ease of use, without compromising on privacy.

It works in 4 straightforward steps:

1. Customise the sender: choose a name, or leave the field blank.
2. Type your message.
3. Enter the recipient's number.
4. Confirm sending — all without creating an account or providing personal information.

What makes our tool different:

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

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

It is 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

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 store IP addresses and connection logs. In the event of a judicial requisition (during a criminal investigation), this information is 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 should not be used as a shield to commit abuse.

What is completely legal:

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

What is strictly illegal (and punishable under the Penal 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 exposing yourself, try SmsJuice to send a free anonymous SMS in France, easily and with no registration required.