Phone

int i = 0;
void setup() {
  pinMode(2, OUTPUT);
}

void loop() {
  while (i <= 12)
  {
  tone(2, 500);
  delay(50);
  tone(2, 400);
  delay(50);
  i = i+1;
  }
  noTone(2);
  delay(3000);
  i = 0;
}