My new 4S rings through the speaker, even if I have headphones plugged in, if the ringer switch is turned on. I don't want to turn it off because then I hear no notifications at all through the headphones, but the ringer is a deal breaker at work. I don't remember this behavior with my 3GS--when you plugged in headphones, all sounds went to them only. Anyway, if someone could create a hack to enable this I'd be very grateful. TIA.