i just wanna ask if it is possible to automatically send SMS via GSM MODULE, because i really needed to do that for my thesis. if it is possible, can you attach the codes. THANKS 
also, if the GSM MODULE can receive messages and Serial.print what it has received, attach the codes too. THANK YOUU
Yes, it is possible to send and receive SMS messages, make and break calls and so on. If your GSM modem or module is not genuine Arduino you should get a manual for your SMS module. The rest is sending simple commands via serial bus to your module. You will find those commands from the manual of your module.