My iPhone doesn't always ring, why?
I've had my iPhone 4S since it's introduction, I love it, except it doesn't always ring when I get a call. Yes, Airplane mode is off, the ringer is on. Take yesterday for instance, over a period of 5 hours, four calls didn't ring, 3 went to VoiceMail, one showed as a missed call, three other calls came through normally. During this entire time the phone was sitting on my desk, fully charged.
Has anyone else had this problem?
iPhone 4S, iOS 5.1.1