Unable to communicate with GSM module and P89V51RD2 MCU

#include<reg52.h>
#include<stdio.h>

sbit LCDrs=P0^0;  //The Register select Pin
sbit LCDrw=P0^1;  //The Read/Write Pin
sbit LCDen=P0^2;  //The Enable Pin

char sbuf[16],c,store; 
char buf[16]; 
void transmit(unsigned char );
void delay(unsigned int rtime)
	{
	unsigned int r,s;
	for(r=0;r<rtime;r++)
	for(s=0;s<1275;s++);
	}
void lcdcmd (unsigned char DATA)
	{

				LCDrs=0;
				LCDrw=0;
			    LCDen=1;
				P1=DATA;
				LCDrs=0;
				LCDen=0;
	}
void initialize (void) 
	{
				lcdcmd (0x30);	 //1 line and 5x7 matrix 
				delay(1);
				lcdcmd (0x38);	 //2 line and 5x7 matrix
				delay(1);
				lcdcmd (0x0C);	 //Display on, cursor off
				delay(1);
				lcdcmd (0x01);	 //Clear display Screen
				delay(1);
				lcdcmd (0x06);	 //shift cursor to right
				delay(1);
	}
void lcddat (unsigned int DATA)
	{      

				LCDrs=1;
				LCDrw=0;
				LCDen=1;
				P1=DATA;
				LCDrs=1;
				LCDen=0;
	}
void display_lcd (unsigned char location, unsigned char *d)
	{  
					lcdcmd(0x80 | location); 
					delay(1);
					while(*d)
					 	{
					 	  lcddat(*d++);  
					 	  
					 	}	 
	}
char mygetchar(void) 
{ 
char c; 
while(!RI); 
RI =0; 
c = SBUF; 
return SBUF; 
} 
void init()
{
TMOD=0x20;
TH1=0xFD;
TL1=0xFD;
SCON=0x50;
TR1=1;
TI=1;
}
void main()
{
int i;
init();
ES=1;
EA=1;
P0=0xFF;
initialize();

	display_lcd(0x80, "   Serial Port  ");	
    display_lcd(0xC0, "    Reception   ");
	delay(300);

display_lcd(0x80, "   Serial Port  ");


		
    display_lcd(0xC0, "    Ready!      "); 

transmit('A');
transmit('T');
transmit('\r');


for(i=0;i<16;i++)
	{
	store=mygetchar();
	sprintf(buf,"%c",store);
	display_lcd(i,buf);
	}
	lcdcmd(0x01);
while(1) 
{
 
}
}

void transmit(unsigned char c)
{
while(!TI);
TI=0;
SBUF=c;
}