I'm worried with my apple iphone, it's not working,because the display of its features (example: messaging,gallery,email etc,) can't be open and not functioning! I mean, you can see the icon of every features but you can't use it..

I remember I accidentally dropped it last week,but when I checked it,It's okay,,but after a week,my apple iphone is not okay,

I'm planning to go and ask in a certain place in the mall tomorrow, but I'm wishing,someone could help me or give me some idea

thanks..