Clap to lock or unlock phone is a free Android app developed by BambooGaming under the Personalization category. This app allows users to remotely change their phone's lock screen status by clapping their hands. The app works in the background and waits for the sound of clapping. When a user claps their hands loudly, the phone screen will lock or unlock depending on the current state of the lock screen. The app is easy to use and can be shown off to friends, leaving them impressed that their phone can react to clapping sounds. It's important to note that this app uses the Device Administrator permission.