Is there?

Is (someone) there?

Is someone available to talk on the phone? A: "Hey, is Jen there?" B: "May I ask who's calling?"
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

Is someone there?

a way of requesting to talk to someone in particular over the telephone. (This is not just a request to find out where someone is. The someone is usually a person's name.) Tom: Hello? Mary: Hello. Is Bill there? Tom: No. Can I take a message? Tom: Hello? Mary: Hello. Is Tom there? Tom: Speaking.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
References in classic literature ?
"'Who is there?' cried the Doctor, putting his head out of his bedroom window.
Full browser ?