PLEASE HELP

Hardware Arduino GSM Shield
1

Pls help
1: recieve text message: 033194237826

  1. if 0331 then ATD94237826

  2. code:

else if(ring.substring(0, 4) == "0331\r"){
Serial.println("----Call-Back-number---");

mySerial.print (F("ATD")); // Call ATD command send to SIM800
mySerial.print (ring.substring(4)); // ATD + mynumber String value
mySerial.print (F(";\r\n"));

delay(300);

  1. Error

ATD94237826
;
-> NO CARRIER

??? please help

2

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