I've took a look around the forum, and other websites about this, and tried to follow directions given for other handsets, but I have not found a calibration tool for the Xperia X8. If my memory serves me right, I did do calibration test on the first start-up. Is it possible to touch screen via fingernail? My X8 does not respond to it, no matter how hard I press. I am forced to splodge the middle of my thumb onto the screen and this is very, very inaccurate. Matters are not helped because I cannot use the end point of my thumb, because I play guitar, and have a longer fingernail. Even if using a nail is impossible, I would like to re-do the calibration test and see if that improves things, but I cannot find it anywhere.