i currently do the final year project of home automation system. and I use Arduino as a Microcontroller, PIR sensor and GSM shield to contact with the owner.
But when I run the GSM library and click on the serial monitor, it only appear "SMS message sender", it does not display "enter a mobile number" . and the blinking LED in the GSM shiled of "status" and "network" also not working.
Why my GSM shield does not working as in the video in youtube?