The Active Directory PhoneBook tool is a standard application.
You can use it to view all users in the Active Directory and browse through their contact information as listed in the basic fields in AD.
By default, you can view AD information, but when the module is activated, you can also use the PhoneBook to update and maintain user information.
The PhoneBook can be used by non-technical employee.
Example where the PhoneBook is used to update mobile number in Active Directory: