hello, I have had my iPhone since christmas. It is running 1.1.4, never jailbroken, unlocked it or anything, never dropped it. I have had it in an iSkin revo since I bought it. About 15% of the time when I "slide to unlock" the screen just goes blank, doesn't respond so I have to do a harsh restart. It might be a glitch, not sure. I don't have extended warranty though...hope someone could help me!!