Dropped my iphone 4 and now my screen is white?

I actually dropped it when trying to turn off my alarm and with intent of catching it, grabbed it and hit it off the side of my bed. My heart near stopped when i realized that it now has a white screen. I can turn it on and off with the top button and the circle at the bottom. When i turn it on my alarm is still ringing, so i'm guessing that the phone itself still works but its just the screen.

does anyone know if i'm gonna have to get this phone fully replaced? I really don't want to have to do that as 1, its going to be awfully pricey, and 2, i have so many things on that phone e.g. Pictures that i do not want to lose. And i don't think they all saved or got copied because i had very little memory towards the end there and backups didn't work.

oh! And i got this phone online. I didn't buy it from the apple store, so i have no warren tee. So i really don't know whether to still go to apple or go to o2 or what.

any help would be appreciated.

If it kind of look like white heat view, then double tap the home button.