Expressions Telephone Conversation

Last thursday, we learned about telephone conversation. She explained  how the meaning changes if I put two different words togather. It was a very useful time for me. I didn't know before what's different between cut out and cut off. But now I know. And I can end conversation politely now. I get one tip from that study. usually when Canadian want to be polite, they say it is not you it is me. "may I have to get back to you" or "I'll let you go now". I think those are very good way to end conversation on a telephone.