gsm dont send msg

hello, I am doing project on GSM but it not respond my controller(AT89S52)..
This is my C code..
please any one help me out..

#include<reg51.h>
#include<stdio.h>
#include<stdlib.h>
unsigned char Command_AT[]="AT\r\n";
unsigned char Command_CMGF[]="AT+CMGF=1\r\n";
unsigned char Command_CMGS[]="AT+CMGS =+917405738609\r\n";
unsigned char CtrlZ=0x1A;
unsigned char msg02[]="TAMARO BABO RADE CHE";
#define display_port P0      //Data pins connected to port 2 on microcontroller
sbit rs = P2^7;  //RS pin connected to pin 2 of port 3
sbit rw = P2^6;  // RW pin connected to pin 3 of port 3
sbit e =  P2^5;  //E pin connected to pin 4 of port 3
sbit obj = P1^0;
sbit aud = P1^1;

void msdelay(unsigned int time)  // Function for creating delay in milliseconds.
{
        unsigned i,j ;
        for(i=0;i<time;i++)
        for(j=0;j<1275;j++);
}
void GSM_modem(void)
{
        msdelay(500);
        puts(Command_AT);
        msdelay(500);
        puts(Command_CMGF);
        msdelay(500);
        puts(Command_CMGS);
        puts(msg02);
        CtrlZ=0x1A;
        msdelay(500);
        while(!TI); TI = 0;SBUF = 0x1A;
}
void serialcommunication(void)
{
        TMOD = 0x20;
        SCON = 0x50;
        TH1 = 0xFD;
        TL1 = 0xFD;
        TR1 = 1;
        TI = 1;
}
void lcd_cmd(unsigned char command)  //Function to send command instruction to LCD
{
        display_port = command;
        rs= 0;
        rw=0;
  e=1;
        msdelay(1);
  e=0;
}

void lcd_data(unsigned char disp_data)  //Function to send display data to LCD
{
        display_port = disp_data;
        rs= 1;
        rw=0;
  e=1;
        msdelay(1);
  e=0;
}

void lcd_init()    //Function to prepare the LCD  and get it ready
{
        lcd_cmd(0x38);  // for using 2 lines and 5X7 matrix of LCD
        msdelay(10);
        lcd_cmd(0x0F);  // turn display ON, cursor blinking
        msdelay(10);
        lcd_cmd(0x01);  //clear screen
        msdelay(10);
        lcd_cmd(0x81);  // bring cursor to position 1 of line 1
        msdelay(10);
}
void main()
{

        unsigned char a[15]="*BHATT MAITREY*";    //string of 14 characters with a null terminator.
        int l=0;
        lcd_init();
        serialcommunication();
        GSM_modem();
        while(a[l] != '\0') // searching the null terminator in the sentence
    {
                        lcd_data(a[l]);
                        l++;
                        msdelay(50);
                }

                if(obj==1)
                {

                                        unsigned char a[15]="OBJECT AYI GAYO";                        //string of 14 characters with a null terminator.
                                        int l=0;
                                        lcd_init();
                                        serialcommunication();
                                        GSM_modem();
                                        while(a[l] != '\0') // searching the null terminator in the sentence
                        {
                                        lcd_data(a[l]);
                                        l++;
                                        msdelay(50);
                        }

                }

                aud=0;
                aud=1;
                if(aud==1)


                {
                                        unsigned char a[15]="AUDIOO AYI GAYO";    //string of 14 characters with a null terminator.
                                        int l=0;
                                        lcd_init();
                                        serialcommunication();
                                        GSM_modem();
                                        while(a[l] != '\0') // searching the null terminator in the sentence
                                {
                                        lcd_data(a[l]);
                                        l++;
                                        msdelay(50);

                                }
                        }
                }