launch button is not working

i have created a file name is "mysms"

and i have written this code
call("+447700900444", array(
   "network" => "SMS")
say ("Don't forget your meeting at 2 p.m. on Wednesday!");
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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