Arduino analog input values are not stabilizing

/*
 * Complete Project Details sripcbcreations@gmail.com
 */
 #include "SIM900.h"
#include <EEPROM.h>
#include <neotimer.h>
// Include Software Serial library to communicate with GSM
#include <SoftwareSerial.h>
#include "sms.h"
#include "call.h"

SMSGSM sms;

CallGSM call;
// Configure software serial port

bool phasecondition = true;
int value=0;

Neotimer mytimer = Neotimer(60000);
Neotimer timer1 = Neotimer(10000);
Neotimer timer2 = Neotimer(10000);
Neotimer timer3 = Neotimer(10000);

String num = " ";

char number[20];
byte stat=0;

// dont touch below code;
int numdata;
boolean started=false;
char smsbuffer[160]; //160 here
char n[20];

//debug begin
char sms_position;
char phone_number[20]; // array for the phone number string
char sms_text[100]; // 100 here
int i;

// dont touch above code

String checknumber=" ";

void SendTextMessage(String s, bool b1, bool b2);

void(* resetFunc) (void) = 0;  // declare reset fuction at address 0

// Variable to store text message
String textMessage;

// Create a variable to store Lamp state
String Motorstate = "off";

// Relay connected to pin 3
//const int relay = 9;
int currReading;
int prevReading;
int motor1 = 3; // motor pin connection
int dryRun = 2; // sensor for identifying water flow and used for dry run

int ALLPHASEOK = 5;  //ALL Phase OK LED
int PHASEMISSING = 6; //Phase missing LED
int HIGHVOLTAGE = 4; // high voltage led

int analogPin0 = A0;
int analogPin1 = A1;
int analogPin2 = A2;

int smsPinValue =0;
bool timerState = false;
int analogval0 = 0;
int analogval1 = 0;
int analogval2 = 0;
int dryRunvalue = 0;

int sms_count = 0; //count the SMS sent
int sms_count1 = 0; //count the SMS sent
int sms_count2 = 0;

int dryRunCount = 0;

//300v and analog pin shoud have 5v

int threshold_Low = 300;//180v and analog pin should have 3v

int threshold_High = 950;//270v and analog pin should have 4.5v

String changedphonenumber = "";
const int eeprom_size = 20; // values saved in eeprom should never exceed 500 bytes
char eeprom_buffer[eeprom_size];

void setup() {

  pinMode(motor1, OUTPUT);
  pinMode(ALLPHASEOK,OUTPUT);
  pinMode(PHASEMISSING,OUTPUT);
  pinMode(HIGHVOLTAGE,OUTPUT);
  pinMode(motor1,OUTPUT);
   
  // clear eeprom on new flash... just for debugging
 // for (int i = 0 ; i < EEPROM.length() ; i++) {
  //  EEPROM.write(i, 0);
 // }
  
  if (EEPROM.read(800) == 1)
  {
    read_string_from_eeprom(eeprom_buffer);
    Serial.println("check the value ");
    String storednumber(eeprom_buffer);
    Serial.println(storednumber);
    storednumber.trim();
    changedphonenumber = storednumber;

  }
  else
  {

    changedphonenumber = "9705422218";
  }
  sms_count = 0;
  sms_count1 = 0;

      //Serial connection.
    Serial.begin(9600);
    Serial.println("GSM STARTING ");
    //Start configuration of shield with baudrate.
    //For http uses is raccomanded to use 4800 or slower.
    if (gsm.begin(4800)) 
    {
        Serial.println("\nstatus=READY");
        started=true;
    } 
    else 
       Serial.println("\nstatus=IDLE");

  analogval0 = analogRead(analogPin0);
  delay(100);
  analogval1 = analogRead(analogPin1);
  delay(100);
  analogval2 = analogRead(analogPin2);
  delay(100);

 
   if (analogval0 < threshold_High &&analogval0 > threshold_Low && analogval1 < threshold_High &&analogval1 > threshold_Low && analogval2 < threshold_High &&analogval2 > threshold_Low )
  {

    //SendTextMessage("All phase are ok");
  //  //Serial.println("IN SETUP --->  All phase are ok : SMS Sent");
    delay(1000);

    SendTextMessage("SYSTEM READY", false, false,false);
    delay(100);

    digitalWrite(ALLPHASEOK, HIGH);
    digitalWrite(PHASEMISSING, LOW);
  }
  else
  {
      delay(3000);
   // //Serial.println("IN SETUP --->  PHASE MISSING AND  SMS Sent");
    delay(100);
    SendTextMessage("3 PHASE NOT AVAILABLE", false, false,false);
    delay(100);

    digitalWrite(ALLPHASEOK, LOW);
    digitalWrite(PHASEMISSING, HIGH);
     digitalWrite(HIGHVOLTAGE, LOW);
  }
}

void loop(){
  analogval0 = analogRead(analogPin0);
  delay(10);
  analogval1 = analogRead(analogPin1);
  delay(10);
  analogval2 = analogRead(analogPin2);
  delay(100);
  
   Serial.println(String(analogval0) + " " + String(analogval1) + "  " + String(analogval2));
   delay(100);