Calls and contacts
Apps and media
Cause 1 of 2: The app is damaged or has not been updated to the newest version.
If you can't use one of your apps, the app may be faulty or it needs to be updated to the newest version.
Solution: Uninstall the app and install it again.
Press and hold the required app until the icons start to jiggle.
Press the delete icon.
Return to the home screen
Press the Home key to return to the home screen.