第一句：Who's that speaking?
A: Hello, is this 4474716? I'd like to speak to Mr. Wang.
B: Who's that speaking?
A: It's Jane. I'm so sorry that I made such an early phone call.
第二句：Who's (that) calling?
B: Will you please call Smith to the phone?
A: Who is calling?
B: It's John from New York.
May I ask who's calling? 请问你是谁？
May I have your name, please? 请问你是谁？
接电话时若要找的人一时过不来，可以让其稍等，用英语说：Hold on, please. 请稍等。
或者说：Your party is on the line. 您要找的人来接电话了。