OK I updated to 2.1 on the AT&T network, now everytime my phone goes into standby( screen goes blank or off) when I press the home key I get a message in the notification bar that I have no sim card and no network signal. Also I can not send or recieve text messages, battery life is terrible it doesn't last a day and I do not have anything installed except what I had on 1.6, I have turned down the screen brightness. The only good thing I can see about this update on AT&T is that the screen has much more detail. So far I have not found a solution to any of the problems I am having. Is anyone else having any of these problems? Thanks for any help.