If you're looking for a fun app to prank your friends and colleagues, School Bells Sounds Prank by Novyisoft is a great choice. As the name suggests, the app lets you play different school bell sounds, with the option to turn on/off vibration. The app is available for Android and is completely free.

The app has a simple user interface with a main menu that lets you choose from 6 different bells. Once you select a bell, just tap on it to hear the sound. The app also lets you adjust the vibration settings according to your preference. It's worth noting that the sounds are not real, but only imitate the sound of school bells.

Overall, School Bells Sounds Prank is a harmless and entertaining app that can be used for pranks or just for fun. It's easy to use and the sounds are realistic enough to trick your friends. However, it's important to remember that the app is just a prank and should not be used to cause harm or distress to anyone.