What can we say if we didn't hear what the speaker said?
Can you speak louder? / Can you speak again?
To return a phone call (v)
Call back (v)
Wait for a short time (v)
Hold on (v)
How can you say to leave a message for someone?
I want to leave the message for ... / This message is for ...
What phrases can we use to tell the speaker to slow down?
Can you speak slowly?
How can you introduce your name in a phone call?
... 's speaking. / This is ...
How can we end a phone conversation ?
Sorry. I have another call. I will call you back later.
What is your phone number?
....