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try to test at command on hyperterminal whether you recieve sms , if this part is successful try to do it with gsm module, make sure
IF THE DEVICE USE HARDWARE HANDSHAKING – Use RXD, TXD, GND , RTS AND CTS pin while doing serial communication.
try installing mplab x version… it should work
which GSM Module are you using…… are you able to receive data on hyperterminal,,,, se examples on http://pic18forstudents.co.uk/ hope it help you..