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Yeah, the video is mirror reversed, i know :)

Just also noticed the same sound when I'm getting an email. That's pretty tough... :p
 
Sounds like the noise cancelation mic is picking up the lock noise and looping it, through the speaker.
 
That's one evil sounding iPhone right there, my suggestion is to KILL IT...KILL IT WITH FIRE!!!
 
I just restarted it... seems to be okay... for now... :)

So you took the 30 seconds to restart it AFTER you spent all the time making the vid, posting on youtube, posting here and god knows how many other forums.
Entire thing is screaming LOOK AT ME!!
 
Today I noticed some annoying noises coming out of my iPhone 4 when I'm putting it to sleep. I made a short video of it so you guys look for yourself what I experienced.

http://www.youtube.com/watch?v=zBxlYSUmk8s

I had the exact same sound, which was produced the exact same way. I powered off and back on and the sound never came back. That was about two weeks ago. I determined that the sound only happened when I had lock sounds enabled.
 
So you took the 30 seconds to restart it AFTER you spent all the time making the vid, posting on youtube, posting here and god knows how many other forums.
Entire thing is screaming LOOK AT ME!!

Exactly!
Except for only left a posting on macrumors.

Was just asking myself if someone could reproduce the same bug.
 
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