1
general::
Phrase(s): What number are you calling?
an expression used when one suspects that a telephone caller may have gotten the wrong number. • Bob (on the telephone): Hello? Mary: Hello, is Sally there? Bob: Uh, what number are you calling? Mary: I guess I have the wrong number. Sorry. Bob: No problem. Good-bye. • When the receptionist asked, "What number are you calling?" I realized I had made a mistake.
McGrawhill's American Idioms And Phrasal Verbs