Hey. I just bought New SIM900A V4.0 GSM module, but I'm quite confused. There was no manual so I don't really know how to use it. I was looking for tutorials through google, but could not find anything useful paticularly for this GSM module. Could anyone please direct me to some website where I could find: how to connect it to Arduino Mega 2560 and some sample codes.
Any help is appreciated. 