Find phone by Clap and Whistle is a good phone finder by clapping. Just turn on find my phone by clapping and leave the rest on device finder. Find My Device by Clap app uses the device's microphone to detect a user's clapping sound and trigger an alarm on the missing phone. The alarm will continue to ring my phone until the user find my device. How to use Find My Phone by Clap, Whistle: 1. Start the Find My Device application 3. Click the Activate button 4. It will detect clapping sound when