SIM800 Arduino Samle

#include <SoftwareSerial.h>
#define DEBUG true
SoftwareSerial mySerial(10,11 );// RX, TX
String data[5];
String state,timegps,latitude,longitude;
String Operator,Balance;
String Phone = "0912xxxxxxx"; 

String sendData (String command , const int timeout ,boolean debug)
{
  String response = "";
  mySerial.println(command);
  long int time = millis();
  int i = 0;
 
  while ( (time+timeout ) > millis())
  {
    while (mySerial.available())
    {
      char c = mySerial.read();
      response +=c;
    }
  }
  
  if (debug) 
  {
    Serial.print(response);
  }
return response;
}

String word_filter(String str,String start,String end)
{
  int Word1 = str.indexOf(start);
  int Word2 = str.lastIndexOf(end);
  return str.substring(Word1 , Word2);
}

String GetOperator()
{
  delay(50);
  mySerial.println("AT+COPS?");
  mySerial.setTimeout(100) ;
  String input = mySerial.readString();
  mySerial.setTimeout(10) ;
  input = word_filter(input,"\"","\"");
 
  input.trim();
  delay(10);
  if(input=="43235")
  {
    return "Irancell";
  }
  else
  {
    return "Not Recognized";
  }
}

void Operator_Setting(String Operator)
{
 
  String  oprator = GetOperator();
    if(oprator == "Irancell"){
      mySerial.println("AT+CUSD=1,\"*555*4*3*2#\"");
    }
      delay(3000);
      mySerial.println("AT+CUSD=2");
 
}

void GSM_Initilaize() 
{
  boolean gsm_Init = 1;
  while (gsm_Init > 0) {
    mySerial.println("AT");
    while (mySerial.available()) {
      if (mySerial.find("OK") > 0)
        gsm_Init = 0;
    }
    delay(100);
  }
 
  boolean Ready = 1;
  while (Ready > 0) {
    mySerial.println("AT+CPIN?");
    while (mySerial.available()) {
      if (mySerial.find("+CPIN: READY") > 0)
        Ready = 0;
    }
    delay(1000);
  }
 
  mySerial.write("AT+CMGF=1\r\n");
  delay(1000);
}

String GetBalance(String _Operator)
{
 if(_Operator=="Irancell")
 {
 mySerial.println("AT+CUSD=1,\"*141*1#\"");
 mySerial.setTimeout(6000);
 String Balance_Read = mySerial.readString();
 delay(100);
 String firsword = "Credit";
 String lastword = "WOW";
 int Word1 = Balance_Read.indexOf(firsword) + firsword.length() ; 
 int Word2 = Balance_Read.lastIndexOf(lastword);
 if(Word1 ==-1 or Word2==-1)
 { 
    return "0" ; 
 }
 else
 {
   Balance_Read =  Balance_Read.substring(Word1 , Word2);
 } 
 delay(100);
 Balance_Read.replace("Rial", "");
 Balance_Read.replace(".", "");
 Balance_Read.replace("IRR", "");
 Balance_Read.trim();
 return Balance_Read;
 }
}


int Send_Message(String phone , String text)
{                                   
  mySerial.print("AT+CMGF=1");
  delay(1000);
  mySerial.print("AT+CMGS="); 
  mySerial.print("\"") ; 
  mySerial.print(phone);
  mySerial.print("\"") ; 
  mySerial.print("\r\n");
  delay(100);
  mySerial.print(text);
  delay(100);
  mySerial.print(char(26));
  delay(100);
  return 1;
}




void setup() 
{
  Serial.begin(9600);
  mySerial.begin(9600);
  mySerial.println("AT&F");
  delay(100);
  mySerial.println("AT+CMGF=1");
  mySerial.setTimeout(100);
  sendData("AT+CGNSPWR=1",1000,DEBUG);
  delay(50);

  while(1)
  {

    Operator= GetOperator();
    if(Operator=="Not Recognized")
    {
      Serial.println(Operator);
    }// end if operator
    else
    {
      Serial.println(Operator);
      Operator_Setting(Operator);
      GSM_Initilaize();
      Balance=GetBalance(GetOperator());

      // Send_Message(Phone, Balance);
      Send_Message(Phone, "Welcome to SIM808");

      Serial.println(Balance);

      return;
    }
  }// end while

} // end of Main

void loop() 
{



}