I find that I am missing a lot of calls. People just end up in my voicemail and my phone never rings. This only happens when I am playing with my phone in the settings, listening to a voicemail or music or anything. if I just hit the home button and sit there, the phone will ring ok. If my phone is asleep it will ring ok. But if i play with it in any way, the person at the other end hears all the rings but I don't. The ringer is silent and they end up in voicemail. Has anyone else seen this? Is there a way to make incoming phone calls a priority over all other activities?