Guys, I have this same problem. With my 3GS, the Voice Control feature will randomly activate, then pick up ambient noise and start randomly dialing my contacts, or playing music. I have disabled voice dialing, so it no longer calls people, but still randomly plays music. This is NOT caused by sweating, or by the headphones, but can happen at any time, whether the phone is on a desk or in my hand or in its case etc etc. And the phone has NOT been immersed in water. There are at least 4 threads devoted to this problem, so lots of people are suffering, and looking for a way to disable voice control - which unfortunately is impossible. It is a major problem with the Voice Control feature.