India Iphone touch screen (bottom portion) not responding

I have the same problem,
i dropped my iPhone from hand and the lower bottom of the screen seems to be not responding to touch.

rest everything is fine, i tried restoring / upgrading / downgrading / jailbreaking everything..

the software seems to be good..

i have a Unlocked iPhone, so is it ok to go to apple store to get it replaced
more over im in India, can i mail apple store?

please answer...