I just walked into my living room to find the iPhone 4 face down on the wooden floor like a murder victim. I suspect my children had something to do with it, but luckily there was no shatterage or breakitude, so all was well.
Regardless, the glass on your iPhone is prone to damage. That’s why folks like DirectFix.com and iFixit.com offer their excellent repair kits and instructional videos.
Interestingly, DirectFix are the only ones with an iPhone 4 screen available, but they’re sold out right now. So break your phone in a few weeks instead of right now. You’ll thank us.