11th graders 

Customer Service 

Telephone Conversations 

First let’s learn some essential telephone vocabulary, and then you’ll hear examples of formal and informal telephone conversations

://www.espressoenglish.net/telephone-english-phrases/

https://www.englishclub.com/speaking/telephone-phrases.htm

Useful telephone vocabulary and phrases in English.

https://www.learn-english-today.com/business-english/telephone.html