Use APKPure App
Get UWIA: You Whistle I Answer old version APK for Android
Find your phone with just a whistle!!
This app will allow you to find your cell phone when it's lost just by whistling. When you whistle to locate your phone with the screen off, it will answer you! You can choose a sound or even record your own, whichever you prefer.
You do not have to configure anything in its application to detect the whistle and the app and interface is very easy to use.
IMPORTANT: ANSWER ONLY WHEN THE SCREEN IS OFF !
Enjoy!