There is (was?) also Gnokii [1] for old Nokia phones, which I've used successfully. I even managed to port a small part of it to Arduino to send a message autom

There is (was?) also Gnokii [1] for old Nokia phones, which I've used successfully. I even managed to port a small part of it to Arduino to send a message automatically (code [2] and write-up [3]), but these days there are shields with much better interfaces than the Nokia FBus (e.g. using the SIM900 chip [4]). 1: http://www.gnokii.org/ http://www.gnokii.org/ 2: https://github.com/giech/arduino_nokia_6310i https://github.com/giech/arduino_nokia_6310i 3: https://ilias.giechaskiel.com/posts/arduino_sms/index.html https://ilias.giechaskiel.com/posts/arduino_sms/index.html 4: http://www.simcom.ee/modules/gsm-gprs/sim900/ http://www.simcom.ee/modules/gsm-gprs/sim900/