HOW IT WORKS ?

Oh **** here we go again, you lost your phone. Don't start looking for it. No, don't.
You just have to do one thing : ask a friend, your mother, your father, your sister, your dog ... anyone to send you this SMS "J'ai perdu mon téléphone :(" like this :

and that's it ! The Trigger will fire even though the phone is on silent !
Magic, you will find your phone :)