I've never seen any posts about this, so I wonder if I'm the only person experiencing this: On a number of occasions, I've missed incoming calls that I never heard ring. This has happened even when the ringer volume is turned all the way up (it's much too easy to inadvertently lower the ringer volume, but that's another story). Yeah, I know - I live in New York City, where it's easy to not hear a phone ring, but I've missed calls even when I'm in a totally quiet room. Just now, I was sitting with the phone on the table in front of me, and it started lighting up with an incoming call, but the ringer made no sound. I checked and the ringer was up 3/4 of the way, so it should have been ringing. Has anyone else had this problem?