Find My Phone by Whistle is a free lost phone tracker app that helps users find their misplaced or lost phone by simply whistling or clapping. Once the app is enabled, the device will recognize the sound of the user's whistle or clap and start ringing automatically. Additionally, users can manually vibrate their device using the app or turn on the flashlight to locate their phone in dark areas.

The app's "Whistle to Find" and "Clap to Find" features make it easy for users to locate their lost device. Users can also set a ringtone of their choice from their device's storage to ring their lost phone. The app's interface is attractive and user-friendly, making it easy for anyone to use. However, the app requires the location permission to be enabled for finding the lost phone by whistling or clapping. Overall, Find My Phone by Whistle is a convenient and reliable app for tracking lost phones.