gammu software package provides mobile phone management utility, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gammu
gammu is installed in your system.
Make ensure the gammu package were installed using the commands given below,
$ sudo dpkg-query -l | grep gammu *
You will get with gammu package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Communication Programs |
| Package | gammu |
| Version | 1.37.91-1 |
| Description | mobile phone management utility |
| Sub Section | comm |