Hi I just got a brand new 3G 8GB Black iPhone as a birthday gift. It is JB and UL running 3.0 It was working fine, until this morning, when I got a text message it did not vibrate, I then tried switching it to vibrate (silent mode) and nothing, I did check if vibration alert is on for both, silent and ringer mode, and it is. I've already turned on and off, reset it through home + power on/off. And nothing.... Any clues??? I really need the vibrating alert option since I go into meetings a lot. BTW it did work fine this morning when my wake up alarm rang.