第一句：Who are you calling, please?
請問您要找哪位？

A: Who are you calling，please?
甲：請問您要找哪位？
B: Can I speak to Mr. Geller?
乙：蓋勒先生在嗎？

第二句：Who's calling, please?

請問您是哪位？

A: Hello，this is BM Mike. Who's calling，please?
甲：你好，這里是BM公司，我是邁克。請問您是哪位？
B: Hello. Tony Baker speaking.
乙：你好。我是托尼?見克。

知識擴展：

(1)
Anyone in particular?
您要找哪位？
Who in particular?
您找哪位？
Who would you like to talk to?
您想要找哪位？

(2)
Hello! This is Jim. Who's that?
您好，我是吉姆，請問您是哪位？

Hello，this is Tom calling, to whom am I speaking?
您好，我是湯姆，請問您是哪位？
Who's that, please?
請問您是哪位？
May I ask who is calling?
我可以問下您是哪位嗎？