I get about 6 a day, just as another data point. As the other poster said I've set my phone so that only people in my contacts make it ring. Unfortunately that still means I have to manually go delete the voice mail notifications, all of which are 6-10 second of silence (6 out of 7 times) or some Chinese (I'm not Chinese and don't speak Chinese).
Stupidly, AFAICT, none of the phone services bother to auto-delete silent voice messages so I have to manually delete them, each one taking ~6 seconds ("call from One Two Three Five Five Five Six Seven Eight Night at three twenty seven pee em, on friday june twenty sixth ..........." delete. Repeat
Stupidly, AFAICT, none of the phone services bother to auto-delete silent voice messages so I have to manually delete them, each one taking ~6 seconds ("call from One Two Three Five Five Five Six Seven Eight Night at three twenty seven pee em, on friday june twenty sixth ..........." delete. Repeat