I recently update my IPhone 4 to 4.2 and since then the battery life has been horrible. The device will drain the battery through the night when not plugged in,without any use, except being set to be an alarm clock. Email push is on manual. Data roaming is off... I mention this because I first noticed the problem while in Shanghai. I also notice that when on a call the display flashes I have read other threads about poor battery and nothing except having the app Motion GPS appears similar to my issue. There is talk about an app called "case app" and I do not know about this app. My device is about 30 days old. Thanks for anything that can help me.