Short answer: a text message from a five-digit number starting with 6 (such as 60000, 61000, 65000, 66000…) almost always comes from a customer-service platform or a mobile operator. This 6xxxx range of the French numbering plan is reserved for interpersonal communication services and operator-to-customer exchanges; receiving is always free, and sending is deducted from your plan like an ordinary text. If the message asks for a payment, a login or a code, it's a scam: don't click, forward it to 33700.
Updated 21 October 2026.
We're used to short codes in the 36xxx and 38xxx ranges — those used by brands, banks, delivery companies and plan-usage alerts. Far less so to five-digit numbers starting with 6. They're rarer, more discreet, and when they show up in your message list the question comes up straight away: have I just received a premium-rate text?
The answer is no, but it deserves an explanation, because this range follows its own logic within French numbering — and because scammers, for their part, couldn't care less about that logic.
What is the 6xxxx range used for in French numbering?
Five-digit short codes aren't handed out at random: the Arcep (the French regulator for electronic communications, postal services and press distribution) divides the ranges by purpose, and the 6xxxx range covers services tied to interpersonal communication and to the relationship between an operator and its own customers.
In practice, that gives three broad families of 6xxxx senders:
- mobile operators themselves, for your usage figures, plan alerts, activating an add-on, confirming a SIM or eSIM change, and voicemail notifications;
- messaging and gateway services (message drop-off, notification of a transcribed voice message, SMS-to-email gateways);
- certain customer-service platforms backed by an operator or a communications provider.
The difference with the ranges you know better is easy to remember:
| Range | Main use | Receiving | Replying / sending |
|---|---|---|---|
| 2xxxx | Information services, alerts, authorised marketing | Free | Free or deducted from your plan |
| 3xxxx (36xxx, 38xxx) | Customer service, brands, banks, delivery companies, value-added services | Free | From free to premium-rate depending on the service |
| 6xxxx | Interpersonal communication, operator services | Free | Deducted like an ordinary text |
| Alphanumeric sender ("COLISSIMO", "AMELI") | Non-repliable notifications | Free | Cannot be replied to |
The general French rule applies here too: receiving a text never costs anything in mainland France, whatever the sending number. What can cost money is sending to certain value-added short codes — and never to a 6xxxx, which stays within the standard-text regime.
If you want the full breakdown of ranges and price structures, the site's page on SMS short codes in France lists them all, and our article Where did this text come from? Decoding a short code, an alphanumeric sender or an unknown +33 explains the identification method step by step.
Why a five-digit number and not a standard 06?
Because a short code is shared, traceable and cannot be assigned to an individual. An operator sending millions of notifications can't do so from a mobile handset: it goes through a professional sending platform (what's known as A2P messaging, application-to-person) connected to a registered short code.
Three practical consequences for you:
- The short code is public and verifiable. A legitimate service stands behind its number: it lists it in your online account, on its help page or in its terms.
- It's the same for everyone. If a neighbour receives the same message from the same number, that's a good sign. If you're the only person in the world to have seen that number, it's less reassuring.
- It can be shut down. A short code involved in abuse can be reported, and the platform operating it can suspend it. That's precisely what the 33700 scheme makes possible.
We covered how these sending platforms work and where they fall short in Behind the scenes of A2P messaging.
How can I find out who's behind a specific 6xxxx?
The reliable method comes down to four steps, and none of them involves clicking the link you received.
- Read the message without opening the link. Note the service name mentioned, the reason given, any amount quoted.
- Search for the number, not the link. Type the five digits into a search engine along with the word "SMS". A short code genuinely used by an operator or a serious service will appear in its official documentation.
- Check your online account, opening the operator's or service's app manually. If the information in the text is true, it will be there too. If it isn't, the text is fake.
- Call the service's official number — the one on the back of your bank card, the one on your contract, the one on the help page — and never the one given in the text.
For anyone who'd rather not fumble with their phone under pressure, writing those official numbers down once and for all in a telephone address book kept by the landline remains the most robust solution: the day an alarming message arrives, you don't want to be improvising.
The signs that rule out a 6xxxx immediately
- The message demands a payment, however small (€1.99, €2.99): no operator service takes payment via a link in a text.
- It asks for a verification code received separately. A six-digit code must never be shared, with anyone, including someone claiming to be your operator.
- It asks for your account login details or a bank card number.
- It contains a short-deadline threat: line suspension within 24 hours, loss of your number, SIM blocking.
- The link points to a domain that isn't the operator's (a URL shortener, an odd subdomain, an exotic extension).
That last point is the most telling. On a smartphone screen the address is truncated, and that's deliberate. Reading the full address calmly, on a larger screen, changes everything: propping the phone on a desk phone stand and looking at the link with a clear head prevents half of all regretted clicks.
Can you reply STOP to a 6xxxx short code?
Yes, and it's actually the right reflex when the message comes from a legitimate service whose marketing notifications you no longer want. The word "STOP" is mandatory on marketing messages: just reply STOP to the message — unsubscribing is free and must be acted on without delay.
Three important caveats:
- A service message isn't marketing. A plan-overage alert, a login code or a SIM-change confirmation are part of performing the contract: you can't switch them all off with STOP, you have to go through your account settings.
- Never reply STOP to a fraudulent message. Replying confirms that your number is active and read. A scam message should be reported and deleted.
- STOP doesn't work on a non-repliable alphanumeric sender. In that case, unsubscribing is done in your online account or in the service's contact preferences.
We've set out the full logic of unsubscribing and consent rules in SMS and GDPR: the rules for marketing by text in France.
How do I report a fake text imitating a short code?
Through 33700, the national reporting service for SMS spam and scams, run by French operators under the auspices of the Arcep and the AF2M. The procedure is free and takes thirty seconds:
- Forward the suspicious text to 33700.
- You'll receive an automated message asking for the sender's number.
- Reply with that number (the five digits of the short code, or the full 06/07) and nothing else.
- Then delete the original message.
Reports feed into campaign analysis and allow numbers to be blocked and, in the case of links, fraudulent pages to be delisted. You can also report via the 33700.fr website if forwarding doesn't work, and file a report on cybermalveillance.gouv.fr or on the Thésée platform for a clear-cut online fraud.
What happens after you hit send is described in You forward a suspicious text to 33700: what really happens to your report?. And the page report SMS spam to 33700 summarises the procedure in short form.
What if I've already clicked?
The most useful reflex is also the simplest: enter nothing. A link opened without entering any data causes no financial harm. If you did enter information, act in this order:
- Bank card details entered: call your bank immediately and have the card stopped. The first few hours matter.
- Login details entered: change the password for the service concerned, then for your email account if you were reusing the same one.
- Code received by text shared: contact the service concerned to report an attempted account takeover.
- Check your statements for two months, including small recurring amounts.
- Keep the evidence: screenshots of the text showing the number and date, timestamps, statements.
For your most sensitive accounts, replacing SMS codes with a physical FIDO2 security key closes the door for good: even an intercepted code becomes useless. It's the one change that genuinely transforms your risk level, and it costs about as much as a meal out.
The rest of the procedure — filing a complaint, reimbursement, deadlines — is set out in Caught out by a scam text: the 72 hours that decide what happens next.
Should you block a short code?
Rarely useful, and sometimes counterproductive. A legitimate short code will one day send you information you'll want to read: a login code, a usage alert, confirmation of an operation on your line. Blocking it means condemning yourself to never receiving those messages — with the classic outcome of the verification code that never arrives, examined in Text never received: why your verification codes arrive late (or not at all).
For fraudulent campaigns, blocking is even less use: scammers change sender with every wave. What works over the long term is the combination of filtering unknown senders (Messages on iPhone, Google Messages on Android) and systematically reporting to 33700.
A word on filtering, incidentally: on a phone used by an elderly relative, switching it on is often enough to make most of the noise disappear. Messages from unknown senders go into a separate tab, with no notification, while short codes already saved continue to come through as normal. For anyone who struggles to read the small print of a web address, an LED magnifying glass kept beside the phone makes checking the link possible without outside help.
FAQ
Can a text received from a 6xxxx number be premium-rate?
No. In France, receiving a text is always free, and the 6xxxx range falls under the standard-text regime: replying is deducted from your plan like an ordinary text, with no surcharge.
I don't recognise the 6xxxx texting me: how do I identify it?
Search the five digits along with the word "SMS" in a search engine, then check the information announced directly in the app or online account of the service concerned, without going through the link in the message.
Can I send a text to a 6xxxx short code?
Yes, if the service allows it: that's the case for STOP replies, keywords to activate an add-on, or an operator's service commands. Sending is deducted from your plan like an ordinary text.
What should I do if a fake text shows the same short code as my operator?
That's sender spoofing: the message can appear in the genuine conversation thread. Trust the content, never the sender, and check the information in your online account. The mechanism is explained in our article on sender spoofing.
Is replying STOP to spam from a 6xxxx risky?
If the sender is a legitimate service, no: STOP is free and mandatory. If the message is fraudulent, don't reply at all — forward it to 33700 and delete it.
Sources: Arcep (French numbering plan and short code allocation decisions), AF2M and the 33700 scheme, cybermalveillance.gouv.fr, service-public.fr.
