johnwasser:
http://www.cplusplus.com/doc/tutorial/functions/This will teach you about function calls.
Under "Data Types" read everything, particularly 'array'.
Under "Communication" read "Serial".
oooowwww, brilliant!. your link answered some of my questions. you are genius. this codes only sends a message to my number, then what about if i send a message to the gsm shield making the led13 turns on? hopefully you can add a function that can do that.. i hope you know that..