GSM module: Code for Calling using Serial communication

GSM module Serial.ino

void setup() {
// initialize serial communications at 9600 bps:

Serial.begin(9600);
delay(10000);
// print the serial data to GSM
Serial.print("ATD9020XXXXXX;" ); // Change the phone number in code before running the program. change here to call a number using SIM900A
// wait 10 seconds before the next loop
delay(10000);
Serial.print("ATH" ); // hold the call
}

void loop() {
}