French Phrase
C'est quoi ton numéro client ?
Meaning
Literally, "What is your client number?" It is a casual way to ask someone for the identification number they use with a company or service. The phrase is informal because of "ton" and the spoken‑style "c'est quoi".
When to use
Use this sentence when you need a client’s ID in a relaxed setting—e.g., speaking with a colleague, a regular customer, or a friend who has an account. In a formal business call or email, replace it with "Quel est votre numéro de client ?".
✦Grammar Breakdown
C'estquoitonnuméroclient?
C'est quoi
Colloquial way to ask "what is"; literally "it is what". Used in spoken French instead of the more formal "Quel est".
ton vs votre
Use "ton" for informal, familiar contexts (friends, peers). In professional or unknown settings, switch to "votre".
numéro client
A compound noun meaning "client number"; the noun "numéro" is masculine, and "client" acts as a qualifier, not an adjective.
Question mark placement
In French, the question mark is preceded by a space, but many informal texts omit the space.
🗨In Conversation
C'est quoi ton numéro client ?
What's your client number?
C’est le 4521‑78, je l’ai reçu par email.
It's 4521‑78, I got it by email.
✕Common Mistakes
C’est quel ton numéro client ?
The order is wrong; "c’est quoi" must stay together, and the possessive comes before the noun.
C’est quoi votre numéro client ?
Grammatically correct but sounds inconsistent; if you use the formal "votre", switch to the more formal "Quel est votre numéro de client ?".
C’est quoi ton client numéro ?
In French the noun "numéro" precedes its qualifier; the correct order is "numéro client".
↔Alternatives
Quel est ton numéro de client ?
What is your client number?
Quel est votre numéro client ?
What is your client number? (formal)
Pouvez-vous me donner votre numéro client, s'il vous plaît ?
Could you give me your client number, please?
Cultural Tip
In French business culture, using "vous" shows respect, especially with new clients or higher‑status contacts. Reserve "ton" and "c'est quoi" for people you already know well. Also, French speakers often ask for a "numéro client" when you call a service desk, so having it handy speeds up the interaction.