A7 adruino freedompop

void setup()
{
  Serial.begin(115200);  
  delay(200);
  Serial.println("AT");
  delay(1000);
  Serial.print("AT+CREG=0");
  delay(2000);
  Serial.print("AT+CGATT=1");
  delay(2000);
  Serial.print("AT+CGDCONT=1,\"IP\",\"freedompop.foggmobile.com\"");
  delay(2000);
  Serial.print("AT+CGACT=1,1");
  delay(2000);
  Serial.print("AT+CIPSTART=\"TCP\",\"163.172.37.175\",4444");
  delay(2000);
  Serial.print("AT+CIPSEND");
  delay(2000);
  Serial.write("GSM A7 test message!");
  delay(5000);
  Serial.println (char(26));//the ASCII code of the ctrl+z is 26
}

void loop()
{
}