How is a telephone book like a radio?

Explanation:

telephone directory, commonly called a telephone book, telephone address book, phone book, or the white and yellow pages, is a listing of telephone subscribers in a geographical area or subscribers to services provided by the organization that publishes the directory. Its purpose is to allow the telephone number of a subscriber identified by name and address to be found.

dude, * is in your own words, not mine.

* = the answer

these have to be in your own words