I've seen many threads with ppl having trouble with a worn out or not funktioning sound button on their iphones with the sound being stuck in either on or off. My problem seems to be a bit different - see, the button works fine. The sound on/off logo appears everytime I use it. Except as a daily occurance the sound simply does NOT come back on when I turn the button back from mute DESPITE the logo (the big bell with "ringtones" logo - you know the one) appearing just as expected. Hopefully someone can troubleshoot this problem? My workaround is turning the phone off and on again with the button on "sound on" and then the sound comes back on.