Translation:You will find his telephone number on the list.
Since elenco telefonico = phone book can we translate this as "You will find his telephone number in the phone book" ?
I would have thought so. I put "the directory" which is a word we use for the phone book but it was not accepted. Their other suggestion of "in" the list is incorrect. It could be "on the list" if they are thinking specifically of a "list" rather than a directory of some sort.