Need Urgent help in Sending SMS from PC to Hp

void UART_Init (void)
{
        
}

 
unsigned char Command_CMGF[]="AT+CMGF=1\r"; 
// AT+CMGF for selecting Text Mode
unsigned char CtrlZ=0x1A;                   
// CTRL+Z for sedning SMS after the message has been entered
unsigned char Command_CMGS[]="AT+CMGS =+6584528977\r"; 
// recepient mobile number
unsigned char Command_AT[]="AT\r";


unsigned char msg01[]="EMERGENCY! This is a test message\from UART\n\r\n\r"; 
                 
                                         // This is Test Message for 
                                         // Virtual Serial Terminal which
                                        //  is not transmitted by Modem 


unsigned char msg02[]="Hello!";


unsigned int i=0,j=0;


void serial_send()

{  

 volatile unsigned int PORTD;
 volatile unsigned int TRISD;
     PORTD = 0;
     TRISD = 0;           // PORTD is output


    UART_init( 115200 ); 
     // initialize UART module - ( 8 bit, 115200 baud rate, no parity bit... )

     for(j=0;j<sizeof(msg01);j++)
     UART_Write(msg01[j]);


     Delay_ms(100);  // 100 msecond delay


    //*************************************
    for(i=0;i<sizeof(Command_AT);i++)
    UART_Write(Command_AT[i]);  // send data via USART
    //*************************************


     Delay_ms(100);  // 100 msecond delay


     //*************************************
     for(i=0;i<sizeof(Command_CMGF);i++)
     UART_Write(Command_CMGF[i]);    // send data via USART


     Delay_ms(100);  // 100 msecond delay


     for(i=0;i<sizeof(Command_CMGS);i++)
     UART_Write(Command_CMGS[i]);     // send data via USART


     for( i=0;i<sizeof(msg02);i++ )
     {
          UART_Write( msg02[i] );                 // send data via USART
          Delay_ms(100);


     }
  Delay_ms( 1000 );  // 100 msecond delay


  UART_Write( 0x1A );   // send data via USART - ctrl+z
/*********************************************/


  while (1)
  {//Start of endless while loop


         PORTD^=0x0F;
         Delay_ms(100);  // 100 msecond delay


  }//End of endless while loop


}