void setup() {
  // Start communication with the GSM module
  Serial.begin(9600);
  delay(1000);

  // Configure GSM module
  Serial.println("AT"); // Test the communication
  delay(1000);

  // Dial the number
  Serial.println("ATD+1234567890;"); // Replace with the target phone number
}

void loop() {
  // No need for loop in this case
}