First time poster, long time lurker. Don't know if anyone has seen this yet so I thought I'd share this little bug on my iPhone 4. Some users on the Apple support forum have also reported this on their 3GS with iOS4. Simple remedy. Just restart and/or toggle lock sounds. http://www.youtube.com/watch?v=A1u8Pj70ySQ No other issues on mine, aside from the antenna problem.