i don't have an iphone. i have a crappy droid x that's like 6 months beyond expiration date, but 2 months from an upgrade which i dropped face down on a cement patio last night. it now features a beautiful and intricate spider webby crack pattern on the screen. awesome.
i can use the dfb from my phone, it's just kind of a pain. (literally now that i shred the skin on my fingertips every time i swipe across the screen)