How to Set up a Linux GSM SMS Gateway

1. Send your text messages using Alamin. Alamin is an SMS gateway software that you can install on your Linux server, which allows you to send text messages to a GSM phone, and allows that phone to send them back to you. It is a free software package available in Linux repositories. Alamin is designed for a Gnome environment, but with the dependencies installed, you can use it on a KDE machine as well.
2. Use Ozeki NG SMS Gateway for sending text messages to GSM cell phones. The NG SMS Gateway is not an open-source software, but it can transmit SMS messages on Linux computers from a variety of databases as well as using HTTP, e-mail, a command line tool or TXT files. It can send and receive and it can handle up to 500 text messages per second.
3. Manage your SMS messages using smstools. The smstools package is available for free in the Linux repositories. It uses a simple interface that can allow you to send up to 20,000 text messages to GSM cell phones per month. It can send and receive messages and the software automatically detects messages that failed to send and tries to send them again after an hour. The smstools package is Gnome-based, though it will run on machines that have a KDE environment with the proper libraries installed.
4. Transmit your messages with Kannel. Kannel is a message gateway for SMS messages as well as for Wireless Application Protocol (WAP) messages. It is an open-source SMS gateway native to the KDE Linux environment. It runs on Gnome-based machines with the proper dependencies installed on them.