Install gammu-doc by entering the following commands in the terminal:
sudo apt update sudo apt install gammu-doc
Description:
Gammu Manual
This provides gammu module, that can work with any phone Gammu supports - many Nokias, Siemens, Alcatel, ... . This package contains The Gammu Manual, comprehensive documentation covering Gammu command line utilities, Gammu SMS Daemon, Python bindings for Gammu and libGammu library API.
Homepage: http://www.gammu.org
Version: 1.39.0-1
Section: universe/doc