If you have a pass code set, when the Alarm Clock sounds and you slide the "Slide to stop alarm" slider it unlocks the phone without requiring or requesting the pass code, giving you full access to the phone.
I have reported the bug to Apple via bugreport.apple.com.
Anyone else confirm this bug? On my 3G it's 100% repeatable.
iPhone 3G 16Gb, iOS 4, waiting for iPhone 4 in Portugal...
This site contains user submitted content, comments and opinions and is for informational purposes only.
Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site.