If you are a caller
— Hello?
— Is that John?
— Can I speak to John?
— May I speak to John?
When you are a receiver
— This is John speaking, who’s that?
— Who’s speaking please?
— Who’s calling please?
When you ask the caller to wait
— One moment please.
— Just a minute please
— Hold on please.
— Hang on please
When you ask the caller to leave messages
— Can you leave the message?
— Can I take your message?
— Would you like to leave a message?
— Would you like him/her to call you back?
When calling the wrong number
— I’m afraid you got the wrong number
— Sorry, I think you reach the wrong number
When asking the receiver to transfer the line
— Can I have extension 1234 please?
— Could you please transfer the line to Mr. John please
When finish talking
— Nice talking to you
— Talk to you later
