what? I think you should try Ambiance, it has many sounds (including white noise) and you can set the timer, once the timer stops, and you don't use the iphone, the iphone shuts itself down. just like it does when you aren't using it. reply if you didn't understand
i think you (pablo) mean lock the phone, or do u mean really shut down (as in have to see apple logo again when u turn on?)
the apple logo only shows whem you reset the iphone/ipotch. If you leave your iphone OR Ipotch (ipod touch) without it doing anything, it will shut down as it would if you clicked the top "shutting down" button. I doesn't wast any battery. It's just constantly on "sleep" mode.
Besides the only differences btwn Iphone and Ipotch are: -Camera -Microphone -Cell phone everything else is the same