const int checkmyo = 3; void setup() { Serial1.begin(9600); // the GPRS baud rate Serial.begin(9600); // the serial moniter baud rate delay(500); pinMode(checkmyo, INPUT); } void loop() { If (checkmyo==HIGH) { if (Serial.available()>0) ATD(); Serial.write(Serial1.read()); } } void ATD() { Serial1.println("ATD9884038766;"); delay(200000); Serial1.println("ATH"); delay(100); }