What would be the simplest system to send sms from linux server? It`s a Debian system. There would be not much SMSes. What hardware and software to use? Maybe use some SMS sending service?
Each cell phone company offers email addresses to send sms messages to phones. For example verizon uses something like [email protected] to send messages. All you need to do is find a list of each provider's email domain and then find out the service your user subscribes. After that just send the sms like a regular email. This is how most software does it.
Since you are probably looking for a lithuanian service (judging from your name), look into www.gsms.lt.
If you like to to do it yourself and utilize your old mobile phone, try this recipe :-)
There is a real advantage in this approach over using some email SMS service: computer network problems don't affect local hardware. It's especially important if you use SMSes for monitoring your server.
the simplest way is to use GPRS modem or pull of modems. More advance - buy gateway service in cell network operator.
Yeah, I think the simplest way would be getting a serial GSM modem, or a GSM phone with a serial connection, and a SIM card. Some USB ones can work, but is better getting a serial one and staying on the safe side.
Serial modems don't need any drivers, you just need to connect via the serial port (/dev/tty...) and dump there the commmands...
Also, if you want it easier, you can install the SMS Tools available on Linux. They are packaged with the easy name 'smstools' in Ubuntu, Debian, and other Distros.
Last version is number 3, and you can get some info on this site: http://smstools3.kekekasvi.com/