A while back, my iPhone stopped ringing while locked. It didn't seem to matter what settings I used, it simply would not ring. Calls were being missed, so I finally decided to look into it.
What actually seemed to fix it is weird: I went into Settings>Sounds>Ringtone and re-selected my ringtone. That plays the tone, and I guess sort of jars the phone into recognizing it again. After that, the same exact settings worked.
The settings that work are shown below:
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Posted by ellen at June 09, 2009 12:10 PM