#include <SPI.h>

void setup() 
{
  Serial1.begin(57600);                           // Remove PIN at the SIM
  delay(1000);
}

void loop() 
{
  String a;
  
  Serial1.write("ATI\r\n");                        // For AutoBaud

  delay(1000);

  if( Serial1.available() ) {
    a= Serial1.readString();// read the incoming data as string
    SerialUSB.println(a);
  }


//  while(Serial1.available()) {
//
//    a= Serial1.readString();// read the incoming data as string
//
//    SerialUSB.println(a);
//
//  }
  
}