I can't get data fully in sim800l using arduino mega hardwareserial

[ashwin21]

I can't get data fully in SMS (receive from mobile phone) 50 char in sim800l using arduino mega.
I get only 12 characters. I need to get atleast 100 char guys please help me its really helpfull.
i'm waiting.

void setup()
{
  //Begin serial communication with Arduino and Arduino IDE (Serial Monitor)
  Serial.begin(9600);
  
  //Begin serial communication with Arduino and SIM800L
  Serial1.begin(9600);

  Serial.println("Initializing..."); 
  delay(1000);

  Serial1.println("AT"); //Once the handshake test is successful, it will back to OK
  updateSerial();
  
  Serial1.println("AT+CMGF=1"); // Configuring TEXT mode
  updateSerial();
  Serial1.println("AT+CNMI=1,2,0,0,0"); // Decides how newly arrived SMS messages should be handled
  updateSerial();
}

void loop()
{
  updateSerial();
}

void updateSerial()
{
  delay(500);
  while (Serial.available()) 
  {
    Serial1.write(char (Serial1.read()));//Forward what Serial received to Software Serial Port
  }
  while(Serial1.available()) 
  {
    Serial.write(char (Serial1.read()));//Forward what Software Serial received to Serial Port
  }
}

OUTPUT OF MY PROGRAM:-

Thank you guys

Reference link:

In-Depth: Send Receive SMS & Call with SIM800L GSM Module & Arduino

[blh64]

@ashwin21

  while (Serial.available()) 
  {
    Serial1.write(char (Serial1.read()));//Forward what Serial received to Software Serial Port
  }

shouldn't you be reading from Serial not Serial1?

[ashwin21]

thank yor sir