Ok yesterday i was at a friends house and after using my iphone it felt to the ground and now the half of the screen dosen't work, i mean from the line of youtube and above it dosen't work the touch screen i can see it but if i touch it it dosen't work
what should i do

1. hit it till works
2. verginize it and send it to apple
3. open it and se why it dosen't work

Unless you're willing to spend $200 on a new screen and invalidate your warranty, you're going to need to send it in.

ok but how do i send it i mean do i restor it or what can i do to make apple dont notice that my iphone was hacked or it will be accept it eveen though its hacked

I don't know about revirginizing it but i would at least restore it. Then, if you used anySIM V1.1 use oneSIM to undo the unlock. Then you should be good to go.

Just don't bring it in to apple with it hacked, they will not help and they will probably blacklist your iPhone.

Good Luck!

Oh and BTW, Its "It fell" not "It felt"

Sorry I couldn't resist....