Can I tell (one) who's calling?

Can I tell (one) who's calling?

A question asked by one answering the phone in order to learn who is calling for the person requested. A: "Can I speak to Josh?" B: "Can I tell him who's calling?"
See also: can, tell
Farlex Dictionary of Idioms.

Could I tell him who's calling?

 and Can I tell her who's calling?; May I tell him who's calling?
a question asked by people who answer the telephone to find out politely who is asking for someone. (Him or her can be replaced by a person's name or by a plural pronoun.) Mary (on the phone): Hello. Could I speak to Bill Franklin? Sally: Could I tell him who's calling? Mary: It's Mary Peters. Sally: Oh yes, he's expecting your call. I'll get him for you.
See also: could, tell
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • Could I tell him who's calling?
  • Can I speak to (one)?
  • Can I speak to ? Go to Could I speak to
  • Could I speak to?
  • May I tell (someone) who's calling?
  • I'd like to speak to
  • I'd like to speak to (someone)
  • Would you hold(, please)?
  • Can you hold(, please)?
  • Could you hold(, please)?