What is Mary’s telephone number?

W: Hello! 6944969.
M: Hello! May I speak to Mary?
W: Sorry, Mary isn’t in at the moment.
M: Is that you, Jean?
W: Oh, no, I’m Lisa, Mary’s classmate.
M: I’m sorry, well, could you please pass Mary a message for me?
W: Sure. What is it?
M: Could you tell Mary to give me a call as soon as she comes back? My telephone number is 6852173.
W: Wait a minute and let me write the number down before I forget. 6825173.
M: No, it’s 6852173.
W: I’m sorry. 6852173.And may I have your name please?
M: I’m George Brown.
W: All right. I will tell her when she is back.
M: Thank you. Good-bye!
W: Good-bye!