Sending SMS using PIC Micro through GSM Modem

Program code for sending sms using PIC Microcontroller.

#include <16f876a.h>
#fuse hs, nowdt, noput, noprotect, nodebug, brownout, nowrt
#use delay(clock=20000000)
#use rs232(baud=9600, parity=N, xmit=PIN_C6, rcv=PIN_C7, bits=8, stream=GSM)

#int_rda
void serial_isr()
{
   char c;
   c=fgetc(GSM);
}

void main()
{
    enable_interrupts(INT_RDA);
    enable_interrupts(GLOBAL);
    
    fprintf(GSM, "AT\n\r");
    delay_ms(7000);
    fprintf(GSM, "AT+CMGF=1\n\r");
    delay_ms(3000);
    fprintf(GSM, "AT+CMGS=\"+6**********\"\n\r");
    delay_ms(3000);
    fprintf(GSM, "hello FROM mcu");
    putc(26);
    
    while(true)
    {
      delay_ms(1000);
    }
}