Here is a detailed instructional video of the basic operation of sim800 gsm module to Arduino. Any compatible GSM module will work.
Library download link( please select "SIM908IDE100.zip" file":
https://drive.google.com/open?id=0B6H8MrPluf8wMFNEOXlrQzFqeEU
Arduino Mega Version: https://www.youtube.com/watch?v=9BUDri6Qi9o
Video made for public by
www.bohgelectronics.net
Updated 20JUNE2016