SMS Commands using Arduino and GSM Module

Using Arduino Networking, Protocols, and Devices
1

Hello everyone,

I am doing some code for request send data through sms commands.

Here is my code:

#include <SoftwareSerial.h>
// Configure software serial port
SoftwareSerial SIM900(7, 8);

// Create variable to store incoming SMS characters
char incomingChar;

void setup() {
  Serial.begin(9600); 
  SIM900.begin(9600);

  // Give time to your GSM shield log on to network
  delay(2000);
  Serial.print("SIM900 ready...");

  // AT command to set SIM900 to SMS mode
  SIM900.println("AT+CMGF=1\r"); 
  delay(1000);
  // Set module to send SMS data to serial out upon receipt 
  SIM900.println("AT+CNMI=2,2,0,0,0\r");
  delay(1000);
}

void loop(){
  if (SMSRequest()){
      delay(10);
      // REPLACE THE X's WITH THE RECIPIENT'S MOBILE NUMBER
      // USE INTERNATIONAL FORMAT CODE FOR MOBILE NUMBERS
      SIM900.println("AT + CMGS = \"+911234567890\"");
      delay(1000);
      // REPLACE WITH YOUR OWN SMS MESSAGE CONTENT
      String dataMessage = ("Hello From Arduino");
      // Send the SMS text message
      SIM900.println(dataMessage);
      delay(100);
      // End AT command with a ^Z, ASCII code 26
      SIM900.println((char)26); 
      delay(100);
      SIM900.println();
      // Give module time to send SMS
      delay(5000);  
    }
  delay(100); 
}

boolean SMSRequest() {
  if(SIM900.available() >0) {
    incomingChar=SIM900.read();
    if(incomingChar=='S') {
      delay(10);
      Serial.print(incomingChar);
      incomingChar=SIM900.read();
      if(incomingChar =='T') {
        delay(10);
        Serial.print(incomingChar);
        incomingChar=SIM900.read();
        if(incomingChar=='A') {
          delay(10);
          Serial.print(incomingChar);
          incomingChar=SIM900.read();
          if(incomingChar=='T') {
            delay(10);
            Serial.print(incomingChar);
            incomingChar=SIM900.read();
            if(incomingChar=='E') {
              delay(10);
              Serial.print(incomingChar);
              Serial.print("...Request Received \n");
              return true;
            }
          }
        }
      }
    }
  }
  return false;
}

Output window shown when I type "STATE" and send it to GSM module:

SIM900 ready...STATE...Request Received 
S

but no text received in my mobile when I am sending "STATE".

Please help me.