iPhone 3G Loses Functionality With iOS 4.0
Update 2: Thanks commenters - power cycling the iPhone 3G resolved the issue.
Update: Lifehacker has instructions for returning to iPhone 3.x
I was on my iPhone 3G last night and pressed the home button to look at my calendar, and nothing happened. Prior to "up"grading to iOS 4.0, I could always be on the phone and read my email or calendar or surf the web to look something up. With iOS 4.0, I can't.
I would like to go back to iPhone OS 3.0.