GSM/GPS Module changing the pins

#include <LiquidCrystal.h>

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

void setup()
{
  
   lcd.begin(16, 2);              // start the library
   lcd.setCursor(0,0);
   lcd.print("WAIT..");
 
  pinMode(10,OUTPUT);//The default digital driver pins for the GSM and GPS mode
  pinMode(11,OUTPUT);
  pinMode(12,OUTPUT);
  digitalWrite(12,HIGH);
  delay(1500);
  digitalWrite(12,LOW);
 
  digitalWrite(10,LOW);//Enable GSM mode
  digitalWrite(11,HIGH);//Disable GPS mode
  delay(2000);
  Serial.begin(9600); 
  delay(5000);//GPS ready
 
  Serial.println("AT");   
  delay(2000);
  //turn on GPS power supply
  Serial.println("AT+CGPSPWR=1");
  delay(1000);
  //reset GPS in autonomy mode
  Serial.println("AT+CGPSRST=1");
  delay(1000);
 
  digitalWrite(11,LOW);//Enable GPS mode
  digitalWrite(10,HIGH);//Disable GSM mode
  delay(2000);
 
  Serial.println("$GPGGA statement information: ");
}