Problem in send SMS to a person using Atmega8 and SIM 300

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#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#define F_CPU 12000000UL
#define USART_BAUDRATE 9600 // Baud Rate value
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)
#define PIN PB0
void usart_putstr(char * s);
void usart_init();
static void usart_putch(unsigned char send);
unsigned int usart_getch();
void init_Ports(void);
 
int main ()
{
DDRD|=0xFC;//Setting the Tx and Rx Pins Low
DDRB =0x00;//Setting the PortB as input port  
   while (1)
   {
   init_Ports();
   while (PIN==0); //program will loop in this line itself only until the pin become logic high
    
      usart_init(); // initialization of USART
      char b[] = "AT+CMGS=";
      char no[]="+918000000000";
      char body[] ="Got the Output"; 
    {
     usart_putstr(b);
     _delay_ms(100);
     usart_putch('"');
     usart_putstr(no);
     _delay_ms(100);
     usart_putch('"');
     _delay_ms(100);
     usart_putch('\r');
     usart_putch('\n');
     _delay_ms(100);
     usart_putstr(body);
     _delay_ms(100);
     usart_putch(0x1A);
    }
    return 0;
 
   }
}
 
void usart_init()
    {
    UBRRL = 0x0077;
    _delay_ms(1);
    UCSRB |= (1 << RXEN) | (1 << TXEN);   // Turn on the transmission and reception circuitry
    UCSRC |= (1 << URSEL) | (1<<USBS) | (1 << UCSZ0) | (1 << UCSZ1); // Use 8-bit character sizes
    }
 
unsigned int usart_getch()
    {
    while (!(UCSRA & (1 << RXC)) ); // Do nothing until data has been received and is ready to be read from UDR
    _delay_ms(1);
    return(UDR); // return the byte
    }
 
 
static void usart_putch(unsigned char send)
    {
 
    while ((UCSRA & (1 << UDRE)) == 0); // Do nothing until UDR is ready..
    // for more data to be written to it
    UDR = send; // Send the byte
    }
 
 
void usart_putstr(char * s)
    {
      while(*s)
          {
            usart_putch(*s++);
          }
    }
 
void init_Ports(void)
  {
    cli();                    //disable all interrupts
    DDRB = 0x00;   //port B as input
    sei();                   //reanable all interrupts
   }