launch button is not working

i have created a file name is "sms"

and i have written this code
call("+16613420331", array(
"network" => "SMS")
say ("help");
after saving it whenever i click on launch then nothing happen,
so how i can test it. 
 as i click on launch it change to launching and then launched and nothing happen
so my question is how i can test this code ?
is am missing something , 
please help me, i have tried lots of times even by changing browser or by changing pc

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