Send SMS using Uno and elecfreaks SIM900 breakout bord

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i'm trying send sms uno. code i'm using is:
code: [select]
[/
void do_the_switch(void){
  if((pos=="u1front")&&(switch_state=="on")){//verify light position , switch state be.
    digitalwrite(u1frontsw,on);              //switch on light.
    temp='\"'+phone_num+'\"';                //format phone number read sms
    serial.print("temp=");
    serial.println(temp);
    myserial.print("at+cmgs=\"+27716758370\"\r"); //initiate sms sending
    delay(5000);
    myserial.println("u1front switched on");   //send confirmation sms of switching done.
  }code]
it doesn't seem initiate sending of sms. confirmation sms not sent.

can respond?

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