Issue with connecting Arduino Uno and GSM900

Need Help With My Project
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1

I’m getting an issue when i try and use the blank libraries to connect an Arduino Uno with a GSM900 shield. I have tried to send an sms with succes however when I try the Blank library I get this message even though there is an SIM card installed.

[3236]
___ __ __
/ _ )/ /_ _____ / /__
/ _ / / // / _ / '/
///_, /////_
/__/ v0.6.1 on Arduino Uno

[3329] Modem init…
[24969] SIM is missing
Initializing modem…

Anyone experienced the same issue?


/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial

#define TINY_GSM_MODEM_SIM900

#define BLYNK_TIMEOUT_MS     15000UL

// Default heartbeat interval for GSM is 60
// If you want override this value, uncomment and set this option:
//#define BLYNK_HEARTBEAT 30

#include <TinyGsmClient.h>
#include <BlynkSimpleSIM800.h>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "b69fb1e9d06e47a3b35723xxxxxxxx";

// Your GPRS credentials
// Leave empty, if missing user or pass
char apn[]  = "www.internet.mtelia.dk";
char user[] = "";
char pass[] = "";

// Hardware Serial on Mega, Leonardo, Micro
//#define SerialAT Serial1

// or Software Serial on Uno, Nano
#include <SoftwareSerial.h>
SoftwareSerial SerialAT(7, 8); // RX, TX

TinyGsm modem(SerialAT);

void setup()
{
  // Debug console
  Serial.begin(9600);

  delay(10);

  // Set GSM module baud rate
  SerialaAT.begin(19200);
  delay(3000);

  // Restart takes quite some time
  // To skip it, call init() instead of restart()
  Serial.println("Initializing modem...");
  modem.restart();

  // Unlock your SIM card with a PIN
  //modem.simUnlock("1234");

  Blynk.begin(auth, modem, apn, user, pass);
}

void loop()
{
  Blynk.run();
  // You can inject your own code or combine it with other sketches.
  // Check other examples on how to communicate with Blynk. Remember
  // to avoid delay() function!
}