hai PRAJWAL………………
for sending and receiving sms you must initialaze ur gsm modem.
initialization commands are (steps)
AT /*you will get a reply “OK ” ,if the modem is working*/
AT+CMGF=1 /* convert to text mode */
AT+CNMI=2,2,0,0,0 /*receive msg , after reading it will automatically deleted */
for sending
AT+CMGS=”mobile number”<press enter key>
<type msg>
<press control key+Z>
for calling….
ATD<mobile number>; <press enter key>