putString("AT \r\n");
wait();   // or u can read the response here...
putString("AT +CMGS = \"+919999999999\"\r\n");  // hope u wud understand the extra / near /"
putString(message);                                                  //message is a char * or char[]
putChar(CTRLZ);                                                    //CTRLZ defined by abbu :D as #define CTRLZ 26
 

void main()
{
        initUART();
        delay();
        sendString("AT+CMGF=1");  // command to select text mode
        sendChar(13);
        delay();
        sendString("AT+CMGS=\"0999999999\"");// here 09999999999 is recepient's number
        sendChar(13);
        delay();
        sendString("Hello!");  // Hello! will be sent
        sendChar(26);
        sendChar(13);          
}