Police Siren: Sound and Light Simulator. Prank is a free iPhone application developed by Denis Batishchev. This program allows users to turn their device into a police siren, providing a fun and entertaining way to prank friends.

With simple usage, users can easily activate the police siren by pressing the "ON" button. To stop the sound, they simply need to press the button again. The application aims to provide a realistic police siren experience, complete with sound and light effects.

Please note that the developer, Denis Batishchev, provides a disclaimer stating that they are not responsible for any problems users may encounter with the law. It is important to be aware that using police sirens without a license may be illegal. This application should only be used for harmless pranks and not for any illegal activities.