How to hide your number to protect your privacy?

The numbers speak for themselves: with 73% of internet users facing scams in 2025 and over 210,000 cases of identity theft annually, handing out your real phone number left, right and centre 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 the methods that actually work and a comparison table to help you make sense of it all.

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

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

In reality, the code #31# is a network instruction designed only for voice calls (the GSM protocol). SMSs, on the other hand, travel through different protocols (SS7 or IP) where the technical architecture systematically requires the sender's ID to be transmitted.

Basically, 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 rather look at the real solutions.

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 downsides:

• Often restricted destinations: Many of these sites only cover North America.
• One-way communication: The recipient gets the message, but they generally can't 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 short, this method is handy 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.

This is particularly useful in several situations:

• Confirming an account opening (social networks, e-commerce) without providing your personal number.
• Chatting with a stranger after seeing a classified ad (e.g., Leboncoin, Vinted) while keeping a safe distance.
• Testing an application that requires an SMS verification code.

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

A few nuances to keep in mind:

• It's perfect for one-time 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 taking it to the next level. A virtual number for SMS is a real second phone number, stable over time, and managed via an app on your smartphone.

To understand the difference:

• The disposable number is designed to be used once and then thrown away.
• The virtual number is designed to last, allowing you to separate your professional and personal life or maintain a separate digital identity.

The big advantage is that you can send AND receive SMSes anonymously (to the person you're communicating with). Well-known apps like Onoff, Burner, or Google Voice dominate this market. Here's what you need to know if you're in France:

This is the best option if you're looking to send SMSs with another 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 the robustness of encryption. You get a disposable number and use it only 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 developer.
• Disappearing messages: You can set up (especially on Signal) a self-destruct for your chats after they've been read.

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

Comparison table — Which solution should you choose based on 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 turn to 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've designed an approach that prioritises ease of use, without compromising on privacy.

The process is straightforward, in 4 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 sending — all without having to create an account or provide personal information.

What makes our tool different:

• The interface is clean, with no intrusive ads.
• We don't resell your browsing data.
• Routing is optimised for all French networks.
• 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 through our freemium options), safe in the knowledge 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 obligated to store IP addresses and connection logs. In the event of a court order (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 must not be used as a shield for abuse.

What is completely legal:

• Protecting your privacy when communicating with a stranger (e.g., on online marketplaces, dating sites).
• Testing the reliability of an online service without giving your real number.
• Playing a harmless joke on an acquaintance.
• Discreetly checking in with an ex-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

Maintaining control over your privacy and digital security has become essential. If you need to communicate without exposing your identity, try SmsJuice to send a free anonymous SMS in France, easily and with no registration required.