A number calls you and you do not know whether to trust it. Before answering, calling back or sharing any personal information, a few simple checks can save you a great deal of trouble. Here is how to assess the reliability of a phone number in France.
Check the TelCheck reputation score
TelCheck (telcheck.fr) is the most direct tool for assessing a number's reliability. The reputation score ranges from 1 (very trustworthy, no suspicious reports) to 9 (very suspicious, many fraud or spam reports). Beyond the score, examine the category assigned to the number (scam, canvassing, legitimate customer service, government, etc.), the number of reports and community comments. A number with 200 reports and comments mentioning "fake bank adviser" or "CPF scam" should be avoided absolutely.
Analyse the prefix under ARCEP regulations
A number's prefix gives a first indication of its nature. Numbers 01 to 05 are geographic landlines, 06 and 07 are mobiles, 09 are VoIP, 08xx are special numbers with variable pricing. Unknown foreign prefixes are often associated with international scams. However, spoofing can fake any prefix: never rely on the prefix alone without cross-checking with TelCheck.
Search the number in official directories
If the number is supposed to belong to a company or public service, check it on PagesJaunes (pagesjaunes.fr) or directly on the official website of the company concerned. A doctor's number can be verified on Doctolib or the French health insurance website (ameli.fr). A government service number must appear on the official administrative site (service-public.fr). If the displayed number does not match the published official number, this is a major red flag.
Assess the context of the call
Even a number unknown to TelCheck can be trustworthy if the context is consistent. Were you expecting a call from your bank, a doctor or a delivery service? Does the caller have information that only a legitimate entity should know (your name, your customer number)? Be wary, however, if the caller creates a sense of urgency, asks you to share codes or sensitive information, or offers a deal that seems too good to be true.
Warning signs of an untrustworthy number
- High TelCheck score (7–9): strong signal for caution.
- Exotic foreign prefix or 0899: risk of premium-rate charges or ping call.
- Number not found in official directories: suspicious for a supposedly professional number.
- Unsolicited call with urgency and pressure: classic manipulation technique.
- Request for SMS codes or bank operation approval: signature of a fake adviser scam.
When in doubt, hang up and call back
If you have answered and doubt the caller's legitimacy, hang up politely. Find the official number of the entity concerned on its official website or on service-public.fr, wait a few minutes (to avoid being intercepted on a kept-open line) and call back on the official number. A legitimate entity will always understand this verification approach.