How exactly does Direct Call work? It only seems to work half the time I try to use it, and the half when it doesn't work is invariably when I'm trying to demonstrate the feature to someone or just look cool while nonchalantly calling someone. I usually use it when I have a text from someone open, and when it doesn't work it just sends me to the message detail screen as if I had tapped the message (presumably I do tap it with my face). My understanding is that it makes use of the prox sensor to detect when your face is close to the screen, but does it also use some kind of gesture to detect when you're swinging the phone up higher and changing its orientation or something? That might explain why it's inconsistent, because I'm only sometimes making the exact gesture it wants when I bring it to my ear.