Hi guys! Whenever the battery is running low, the notification pops up on screen at 20%, 10% battery power remaining. However, it is strange that there is no sound, at least on my iPhone 3G (2.2.1). What seems even more surprising to me -- there is such low_power.caf file in System\Library\Audio\UISounds directory, which should expectidly be played when battery goes low, but it is not Anybody knows why? Is it possible to make it sound so that I do not miss when I need to plug my iPone to charge? Thanks!