The same unknown number has called you two, three, five times in a single day and you are not sure what to do. This repetitive behaviour is rarely innocent. It can indicate an automated canvassing robot, a ping call attempt, or — less commonly — a genuinely urgent professional or personal call. This guide helps you interpret the situation and react effectively.
Why does an unknown number keep calling back?
Automated canvassing platforms (robocalls) are programmed to dial the same number multiple times until they get an answer. Some systems escalate frequency: one call per hour on day one, then one every thirty minutes. Fraudulent call centres use the same technique to maximise their contact chances. Conversely, a doctor who cannot reach you, a relative with a new number, or an emergency service can also legitimately call several times.
Check the number on TelCheck before doing anything
The first thing to do is enter the number on TelCheck (telcheck.fr). If it is associated with commercial canvassing, scams or robocalls, TelCheck community reports will make this clear. A high reputation score (7 to 9) with many reports is a strong indicator: do not answer and block the number. Conversely, if TelCheck does not know the number or assigns a low score (1 to 3) with no suspicious comments, it may be a legitimate caller.
Analyse the call behaviour
- Very short calls (under 2 seconds): typical ping call signature — the goal is to trigger your curiosity and get you to call back a premium-rate or international number.
- Calls at regular intervals (every 30–60 minutes): canvassing robot or robocall behaviour.
- Calls at unusual hours (night, very early morning): may indicate an offshore call centre in a different time zone, or a genuine emergency from someone close to you.
- Calls that stop after 1–2 rings: the one-ring technique, a mobile variant of the ping call.
Should I pick up or call back?
If the number is flagged on TelCheck, do not answer. If TelCheck does not know the number and the call behaviour seems human (office hours, normal duration), you can answer one of the next calls. Be wary of 0899, 0897 numbers or exotic foreign prefixes (+222 Mauritania, +676 Tonga, +252 Somalia…) where each minute can cost several euros.
How to permanently block this number
On iPhone, go to Phone → Recents, tap the "i" next to the number and choose "Block this Caller". On Android, open your call history, long-press the number and select "Block / Report as spam". Your carrier may also offer a personal blacklist via your online account.
Report the number to protect the community
After blocking, report the number on TelCheck to enrich the community database, and on Signal Conso (signalconso.gouv.fr) if you have identified an abusive commercial practice. In the case of persistent telephone harassment (repeated calls despite your request to stop), you can file a report or complaint with the police or gendarmerie.