Use APKPure App
Get where is my phone (whistle) old version APK for Android
you will never lost your phone again with this app !
if you lost your phone , and you don't remember where you put it the last time, you only need to whistle and your phone will repond you with playing an alarm
just acitvate this app , choose the alarm , and when you lost your phone just whistle , yes yes just do that and your phone will play the alarm and you will be able to find it with no pain