This sequence sends a text message;
Serial.println("at+cmgf=1");
Serial.println("at+cmgs="214244****"");
Serial.print("This is my message");
Serial.write(26); // this is ctrl-z
This sequence sends a text message;
Serial.println("at+cmgf=1");
Serial.println("at+cmgs="214244****"");
Serial.print("This is my message");
Serial.write(26); // this is ctrl-z