Calls and contacts
Apps and media
Cause 1 of 2: There's not enough memory on your phone
To take pictures using your phone's camera, there needs to be enough memory to save the pictures.
Solution: Uninstall apps or delete other content from the memory.
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.