Who was it/that?

Who was it/that?

With whom were you just talking on the phone or at the door? A: "Sorry about the interruption, I had to take that call." B: "That's all right. Who was it?" A: "Just someone from work." A: "Who was that? It's a bit late for people to come to the door." B: "Just some huckster trying to sign me up to their cable package."
See also: who

Who was it?

Who called on the telephone or who was at the door? (Assumes that the caller is not waiting on the telephone or at the door.) Sue (as Mary hangs up the telephone): Who was it? Mary: None of your business. Bill (as he leaves the door): What a pest! Sue: Who was it? Bill: Some silly survey.
See also: who