For example, if you lose your phone and is in silent mode, you can simply send a text message with writing the word that you choice and the phone ring.
To configure it go into settings and click on the message, put here the message with which to ring the phone.
In case of problems you can contact me by e-mail by clicking on the "key": "Send an email to the developer" below
Features present in the pro version:
-Free download pack of extra ringtones
-You can make ring the phone with defined numbers
-You can receive a confirmation message that the phone is ringing