New Hot Sell Luminescent Apple iPhone 4 4G GSM/AT&T LED Glow Logo Mod Kit LED-Black Enhanced light kit is able to light up independent of the front screen! Lights up whenever front screen turns on, but stays on for 15 seconds after front screen is turned off! Lights up while you are holding the phone up to your face and are having a phone conversation, even when front screen is turned off Lights up when there is an incoming call, an SMS is received or the phone alarm is ringing Lights up if any background applications are detected to be sending or receiving data during the iPhone's standby mode