iPhone battery performance decreases after 2.1 update due to apps running when the phone is closed/ turned off (soft off). The latest Bloomberg app continues to use an internet connection to pull news stories (though it needs to re-download them when you want to read them anyway...) after the phone is turned of IF you do do not go back to the home screen when finished using the app. I expect other apps do this where they run while the hone is supposedly turned off. Though I can see the benefit to this type of use (instant messaging), this kills my batterey life. Remember, GO BACK to the home screen before closing the phone. Safari and the built in apps don't do this. Does everyone know about this already??? Haven't seen this comment anywhere.