The following is the conversation that my 18 month old son has on his little (play) phone:
"Hu-oh" pause and listening intently
"to" pause and listening more intently
"fo" pause and listening even more intently
"Ba-bye" waving at the phone
The first time that I heard him having this conversation, I was in the kitchen, and he was in the family room. It is so cute to hear, and I did capture it on film. I found out that his Daddy was teaching him how to have a conversation on the phone - I am sure that he has witnessed many phone conversations too! It is so amazing what our little "sponges" learn.