To clear the cache and cookies on your iOS device you will need to uninstall and then reinstall the app. To do this, follow these steps:
- Go to the "Settings" application.
- Go to "General" and then "Space on iPhone".
- Select "Trivia Crack" and then "Uninstall app".
- Tap on "Uninstall app" when prompted for confirmation. You can also delete the app if you wish.
- Finally, go to the App Store, search for Trivia Crack and reinstall or download the app.