Who is on the phone?

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Who is on the phone?

Who is on the other end of the telephone? A: "Who was that on the phone, John?" B: "Oh, it's just some solicitor trying to sell me life insurance." A: "Who's on the phone, Mommy?" B: "It's Mommy's doctor, so it's very important that I hear what she's trying to say."
See also: on, who