Problem reading "OK" on AT command

char i;
char rec[10];
char old;

void main(){
portb = 0x00;
adcon1 = 0x06;
cmcon = 0x07;
trisb = 0x00;

uart1_init(9600);
delay_ms(500);

uart1_write_text("AT\r");    // Send "AT" and press enter
delay_ms(2000);
i = 0;
do {
  while(!UART1_Data_Ready()) {
   ; // just wait here until a char appears
  }
  old = UART1_Read();
  rec[i++] = old;
} while (old != 'O');
portb = 0xff;   // Flash LEDs
}

while (old != 'A')

while (old != 'T)

    uart1_write_text("AT\r");    // Send "AT" and press enter
    [COLOR="red"]//  delay_ms(2000); No delay!![/COLOR]
    i = 0;
    do {
          while(!UART1_Data_Ready()) {
          ; // just wait here until a char appears
        }
        old = UART1_Read();
        rec[i++] = old;
    } [COLOR="red"]while ((rec[i-2]!='O')&&(rec[i-1]!='K''));[/COLOR]
    portb = 0xff;   // Flash LEDs
}