Whistle to Find your Phone is a free Android application developed by Just4Fun Tools that helps you to locate your lost phone. It is designed to detect sounds similar to whistling and then inform you about your lost device location. This app is very easy to use and can be a lifesaver if you have ever lost your phone in your room, car, desk, or bag and couldn't find it.

The app offers three ways to inform you about your phone's position: sound, torch/light, and vibration. You can choose the kind of melody played when the phone is found, set the volume of the notification to maximum to hear your device from afar, and start the flash lamp of the camera to make finding your mobile easier and faster. The app also has a feature to detect whistle only when the screen is off, which saves the battery level. Additionally, the app detects the moment of incoming call, and this option will unblock the microphone used to detect a whistle for the time of the phone call.