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Discover LudwigThe phrase "phone book" is correct and can be used in written English.
It is typically used to refer to a physical or digital directory of telephone numbers and contact information for businesses and individuals. Example: I found my friend's phone number in the phone book and gave her a call.
Dictionary
phone book
noun
Alternative form of phonebook
Exact(60)
Phone book: 1.
"Any phone book.
I went downstairs, got the phone book.
"Try the Manhattan phone book," he said.
A quiet evening with the phone book.
But the phone book is elusive.
(His number was in the phone book).
He could read the phone book.
I started with the phone book.
(The Manfords were in the phone book).
It's basically a phone book.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com