I accidentally posted this in the main forum instead of the help forum. I've searched and didn't find anything specifically like my problem. I'm not sure if this is an issue with iOS 4 or the iPhone 4 but sometimes my phone decides not to push my exchange email and will instead just fetch my mail as soon as I unlock the screen after not using it for a while. I know this because there is enough time for me to see that there aren't any messages and suddenly the noise pops up and I have several messages that arrived at various times throughout the night. During the day it seems to be fine, and I never noticed it with my old iPhones running 3.x.x. I've tried deleting and setting up my Exchange again but it's the same problem. Any ideas?