Hi there. Since I've upgraded to iOS7 (iPhone 4S), it's the third time in two days that, while I'm talking on the phone, suddenly, Facetime kicks in (going on speaker, adding reverbs, and starting the facing camera). At one time, the phone call just plainly drop once Facetime started. The two other times, the person I'm speaking to just hear reverbs. I know I'm not intentionally pressing the Facetime button (with my finger) while taking - maybe with my cheek? Is there another (secret) way to start a Facetime conversation that I'm not aware of and that I would do without knowing? By the way, none of those 3 peoples have an iPhone, so they are no part of the problem. Anyone had such an issue already? Is there a way you can think of that would stop this from happening? Where's the dargn pref pane for proximity sensor? Thanks! P.S. I never had this issue with the same phone on iOS6.