Somehow this rang through on my iPhone despite my having it in Do Not Disturb mode at the time. I've got it set so that if 2 calls come from the same number within a 3 minute period it will ring anyway, in case of emergency -- however my call log says this number called only once so I can't understand how it rang? Anyway I don't know anyone in Los Angeles (which is where the caller ID was saying it came from) so I didn't answer. No voice mail left. Called it back a few minutes later out of curiosity and conveniently "the mailbox associated with this number is full". Hmm. Blocking this number now.