after two month of use the touch screen of my US-imported iPhone completely lost its sensitivity from one day to another. Even after several restores of the firmware nothing changed. I've heard that it's possible to change the general.plist file so that one can change the sensitivity of the screen. Unforunately the complete screen dosen't react on inputs, so I won't be able to change the sensitivity settings by using the touch screen...
Has anbody an idea how to change the screen sensitivity wihout using the touch screen at all?

I live in Germany so I won't get the imported phone replaced by Apple.

Thanks a lot for you comments!