I don't need to answer this question, Valeuraph made it.
I just want to correct your question : "how do you say "hello" in French"
- Bonjour (during the day).
- Bonsoir (evening time)
- Allô (all day long, but it most likely something you would say while answering the phone)
- Salut (all day long, and it's also used to say: Goodbye!)