one thing odd about my iPhone. I'm a guitarist, and play a lot, and therefore have big calluses on the tips of the fingers of my left hand. My phone often has trouble recognising when one of those fingers is actually touching the screen. Under the right conditions, I can find myself swiping the unlock several times before switching hands to get it to actually open up.

That said, I'm sure that I'm in a serious minority of people with this problem.