If you don't give the number, it may be considered as an unannounced visit or a sincere consultation. Now there are several consultants in a training institution. If you come to sign up, whose name is it? Also, if I told you everything, would you still come to consult? Sometimes the online understanding is one-sided and incomplete, so I may call you back after I ask for the number. Usually I will call you in three days to know that you have signed up or that you have signed up in other places. As long as you tell the counselor exactly that you don't need it, you won't call you again and again, because you have told me that it is unnecessary and there is no point in calling again.