Alright, short intro. New iPhone user, just got a 3GS. Anyways, been messing around with it for a day, and being used to how easy it was on my old phone and not being able to find it on this phone, I need a bit of help. How do you set it to not play a ringtone and only vibrate when you receive a call, when silent is off? I tried putting the bar all the way down, but I can still faintly hear the sound. I just want it to vibrate only when I receive a call. Any help ?