Magic Calculator by Mike Boyd is an Android application in the Lifestyle category that allows users to customize phone numbers displayed on the calculator screen. The app is free to use and developed by Mike Boyd Video.

The app is easy to use, and users can customize the phone number displayed by pressing and holding any of the buttons to access the settings menu. From there, users can choose a contact or grant contacts permissions. The app is perfect for pranking friends as it allows users to display any phone number they want when they press the equals sign.

Overall, Magic Calculator by Mike Boyd is a fun and entertaining app for Android users who enjoy pranking their friends. However, the app's functionality is limited to customizing the phone number displayed on the calculator screen, and it does not offer any additional features or tools.