Telephone Book, Telephone Directory
noun
A telephone (電話) notebook is a book you use with your telephone. It's a telephone book or telephone directory.
でんわちょう
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
この電話帳を整理してしまう方がいいと思います。
We should finish arranging these telephone books.