 const int ASTERISK_PIN = A3;
 const int NUMBER_SIGN_PIN = A4;
 const int PLUS_PIN = A5;
-const int LED_PIN = 13;
 const int AUTO_START_GSM_PIN = 8;
 
 Button buttonHandset(0, 1023);

  pinMode(ASTERISK_PIN, INPUT);
  pinMode(NUMBER_SIGN_PIN, INPUT);
  pinMode(PLUS_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(AUTO_START_GSM_PIN, OUTPUT);
  delay(100);
  digitalWrite(AUTO_START_GSM_PIN, HIGH);

//---- gsm end

void pickedUpHandler(telephone::ButtonState buttonState) {
  isHeadsetUp = buttonState == PRESSED;
  if (isHeadsetUp) {
    Serial.println("Headset up");
    phoneNumber = "";
  } else {
