Who is this?

Who is this?

With whom am I speaking (on the other end of the telephone line)? A: "Hello, is this the Thompson residence?" B: "Yes. Who is this?"
See also: who
Farlex Dictionary of Idioms.

Who is this?

Who is making this telephone call?; Who is on the other end of this telephone line? Tom (answering the phone): Hello? Fred: Hello. Do you have any fresh turkeys? Tom: Who is this? Fred: Isn't this the Harrison Poultry Shop? Tom: No. Fred: I guess I have the wrong number. Mary (answering the phone): Hello? Sue: Hello, who is this? Mary: Well, who did you want? Sue: I want Grandma. Mary: I'm sorry, I think you have the wrong number.
See also: who
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • on one's
  • on someone's
  • (Have you) been OK?
  • pillow-biter
  • out of one's
  • (I've) got to go
  • #dead
  • save someone's skin
  • (something) blows
  • other than