Телефонная книга ПАО Татнефть, developed by Системы документооборота, is a free Android application designed to provide a corporate phone directory. This app is useful for employees of the company in accessing the contact details of their colleagues. The app has a simple interface that is easy to use, and it is available for Android devices.

One of the main features of the app is its search function, which allows users to search for a specific person by name, department, or position. The app also provides access to the user's call history and allows them to add contacts to their phonebook. The app also has a feature that allows users to make direct calls or send emails to contacts within the app.