Scary Girl Scream Call Prank

This is a easy prank playing application on your friends or others. All you need to do is set the timer and place the mobile near them. When the phone rings, let them pick the phone. They'll hear a scary girl screaming on the call. We are not sure if they'll get scared, but you need to play the prank in such a way that they really get scared.
What have we done in this app. :
-We have provided calling screens that looks real.
-You can set the time. 5 sec, 10 sec, 1 minute or 5 minutes.
-The phone will ring as per the set time.
-You'll get the calling screen on the mobile
-You need to pick up the phone
-You'll hear a scared girl screaming.

Hope you like the application.